Index by common name

broomcorn millet, blackseeded proso millet, panic millet, proso, wild millet, wild proso millet, panicum, broomcorn panic (Panicum miliaceum subsp. miliaceum)

broomcorn millet, panicum, blackseeded proso millet, panic millet, proso, wild millet, wild proso millet (Panicum miliaceum subsp. ruderale)

broomsedge bluestem, broomsedge, yellow bluestem (Andropogon virginicus)

browallia (Browallia sp.)

brown mustard, India mustard (Brassica juncea)

brownbeard rice, wild red rice, red rice (Oryza rufipogon)

brownray knapweed (Centaurea jacea)

brussels sprouts (Brassica oleracea var. gemmifera)

buck kee (Astragalus mongholicus)

buckhorn plantain (Plantago coronopus)

buckwheat (Fagopyrum esculentum)

buffalobur nightshade, buffalobur, horned nightshade, Colorado bur, Kansas thistle, Mexican thistle, Texas thistle (Solanum rostratum)

buffalograss (Bouteloua dactyloides)

buffelgrass (Pennisetum ciliare)

bulbous bluegrass (Poa bulbosa)

bull cottonthistle, taurus cotton thistle, Scotch thistle (Onopordum tauricum)

bull crowngrass (Paspalum boscianum)

bull thistle (Cirsium vulgare)

burclover, bur medick, toothed medick, California burclover, bur clover (Medicago polymorpha)

burningbush, kochia, Mexican fireweed, mirabel, mock cypress (Bassia scoparia)

burrobush (Ambrosia dumosa)

burroweed, burrow goldenweed (Isocoma tenuisecta)

Bush's purple coneflower (Echinacea paradoxa)

bushy knotweed (Polygonum ramosissimum)

butter and eggs (Linaria vulgaris)

butterfly milkweed (Asclepias tuberosa)

button eryngo (Eryngium yuccifolium)

buzzy lizzy (Impatiens walleriana)

C

cabbage (Brassica oleracea)

Caesarweed, aramina, Caesar weed, chosuched e kui, dadangsi apaka, hibiscus burrBurr:
Has spikelets or flowers that are compressed closely together by lacking a central axis. The spikelet glumes are hard and pointed, e.g. buffalograss.
, jute africain, common urena, bur-mallow, Congo jute (Urena lobata)

Caley pea (Lathyrus hirsutus)

California barley (Hordeum brachyantherum subsp. californicum)

California blackberry (Rubus ursinus)

California brickellbush (Brickellia californica)

California brittlebush (Encelia californica)

California broomrape (Orobanche californica)

California goldfields, goldfields (Lasthenia californica)

California melicgrass (Melica californica)

California poppy (Eschscholzia californica subsp. californica)

California poppy (Eschscholzia californica subsp. mexicana)

camelthorn (Alhagi maurorum)

Canada bluegrass, flat-stem blue grass (Poa compressa)

Canada germander, wood sage, hairy germander, American germander (Teucrium canadense)

Canada goldenrod, Canadian goldenrod, common goldenrod (Solidago altissima)

Canada thistle (Cirsium arvense)

Canada wildrye (Elymus canadensis)

Canadian anemone (Anemone canadensis)

Canadian milkvetch (Astragalus canadensis)

candle anemone (Anemone cylindrica)

candle larkspur (Delphinium elatum)

candyleaf (Stevia rebaudiana)

canna (Canna sp.)

cantaloupe, honeydew, muskmelon (Cucumis melo)

Canterbury bells (Campanula medium)

Cape daisy, monarch-of-the-veld (Arctotis fastuosa)

Cape tulip (Moraea sp.)

Cape tulip (Moraea collina)

Cape tulip (Moraea schlechteri)

Capeweed (Arctotheca calendula)

caraway (Carum carvi)

cardoon (Cynara cardunculus)

carnation (Dianthus caryophyllus)

Carolina geranium, Carolina crane's-bill (Geranium carolinianum)

Carolina horsenettle, horsenettle, apple of Sodom, bull nettle, devil's tomato, sand briar (Solanum carolinense)

castorbean, agaliya, lama palagi, maskerekur, toto ni vavalagi, uluchula skoki (Ricinus communis)

catnip, catmint, catwort, field balm (Nepeta cataria)

cattail grass, Queensland pigeon grass (Setaria pumila subsp. pallidefusca)

Caucasian bluestem (Bothriochloa bladhii)

Caucasian clover (Trifolium ochroleucon subsp. ochroleucon)

Caucasian stonecrop (Phedimus spurius)

cayenne pepper (Capsicum annuum)

celeriac (Apium graveolens var. rapaceum)

celery cabbage, Chinese cabbage, napa cabbage, nappa cabbage, Peking cabbage, pe-tsai, Shantung cabbage (Brassica rapa subsp. pekinensis)

centipede grass (Eremochloa ophiuroides)

cereal rye, cultivated rye, rye, common rye, cultivated annual rye (Secale cereale)

Ceylon spinach (Basella alba)

chairmaker's bulrush, American bulrush, Olney bulrush, Schoenoplectus (Schoenoplectus americanus)

chamise (Adenostoma fasciculatum)

Chamisso arnica (Arnica chamissonis

chaparral whitethorn (Ceanothus leucodermis)

charlock mustard (Sinapis arvensis)

cheatgrass (Bromus tectorum)

cheeseweed mallow, small-whorl mallow, cheeseweed, small-flowered mallow, mauve parviflore (Malva parviflora)

chervil (Chaerophyllum sp.)

chestnutleaf false croton (Caperonia castaneifolia)

Chewing's fescue (Festuca rubra subsp. fallax)

chia (Salvia columbariae)

chickpea milkvetch (Astragalus cicer)

chicory, French endive, succory (Cichorium intybus)

China aster (Callistephus chinensis)

Chinese dodder (Cuscuta chinensis)

Chinese hound's tongue (Cynoglossum amabile)

Chinese lantern, purple groundcherry, purpleflower groundcherry (Quincula lobata)

Chinese sprangletop, red sprangletop, Asian sprangletop (Leptochloa chinensis)

Chinese thorn-apple (Datura quercifolia)

chokecherry, common chokecherry, Virginia chokecherry (Prunus virginiana)

Christmas candlestick (Leonotis nepetifolia)

churchmouse threeawn (Aristida dichotoma)

cider gum (Eucalyptus gunnii)

cigar flower (Cuphea ignea)

clasping coneflower (Dracopis amplexicaulis)

clavel de muerto (Tithonia rotundifolia)

climbing hempvine, climbing hempweed (Mikania scandens)

climbing nightshade, bitter nightshade, bittersweet nightshade, blue nightshade, European bittersweet, fellenwort, woody nightshade (Solanum dulcamara)

clover dodder (Cuscuta epithymum)

cluster mallow, curly mallow (Malva verticillata)

clustered broomrape, tufted broomrape, clustered broom-rape, purple broomrape (Orobanche fasciculata)

clustered dock, sharp dock (Rumex conglomeratus)

clustered field sedge (Carex praegracilis)

ribbed murainagrass, co muraina, saramattagrass, tho muraina, wrinkle duck-beak (Ischaemum rugosum)

coast tarweed, Chilean tarweed, tarweed (Madia sativa)

coastal sandbur (Cenchrus spinifex)

coastal tidytips (Layia platyglossa)

coatbuttons, cadillo chisaca, tridax, coat buttons (Tridax procumbens)

cogongrass (Imperata cylindrica)

collards, cow cabbage, fodder kale, giant cabbage, Jersey cabbage, Jersey kale, kale (Brassica oleracea var. viridis)

colonial bentgrass (Agrostis capillaris)

Colorado blue columbine (Aquilegia coerulea)

Columbus grass, almum sorghum (Sorghum almum)

comb bushmint, comb hyptis, fausse menthe, mint weed, mumutun lahe, purple top, timothi ni vavalangi (Hyptis pectinata)

commelina (Commelina coelestis)

common balm (Melissa officinalis)

common barley (Hordeum vulgare)

common beet (Beta vulgaris)

common bird's-foot (Ornithopus sativus)

common boneset (Eupatorium perfoliatum)

common borage (Borago officinalis)

common carpetgrass (Axonopus fissifolius)

common catchfly, windmill catchfly (Silene gallica)

common chickweed, chickweed, nodding chickweed (Stellaria media)

common coleus, dwarf coleus (Solenostemon scutellarioides)

common corncockle (Agrostemma githago)

common cowparsnip (Heracleum maximum)

common crupina (Crupina vulgaris)

common dandelion, blowball, faceclock, dandelion (Taraxacum officinale)

common dogmustard (Erucastrum gallicum)

common evening primrose, hoary eveningprimrose, king's-cureall (Oenothera biennis)

common fiddleneck (Amsinckia menziesii var. intermedia)

common flax (Linum usitatissimum)

common globe amaranth (Gomphrena globosa)

common goldenthistle, golden thistle (Scolymus hispanicus)

common gorse, furze, gorse, whin (Ulex europaeus)

common kidneyvetch (Anthyllis vulneraria)

common marshmallow (Althaea officinalis)

common milkweed (Asclepias syriaca)

common motherwort (Leonurus cardiaca)

common mullein, big taper, flannel plant, velvet dock, velvet plant, woolly mullein, flannel mullein, great mullein, mullein (Verbascum thapsus)

common nipplewort, nipplewort (Lapsana communis)

common oat (Avena sativa)

common pepperweed, tall pepperweed, bigseed pepperweed, babyseed pepperweed, miner's pepperweed (Lepidium densiflorum)

common plantain, broad-leaved plantain (Plantago major)

common rue (Ruta graveolens)

common selfheal, healall, selfheal (Prunella vulgaris)

common sheep sorrel, sheep sorrel, field sorrel, red sorrel (Rumex acetosella)

common sneezeweed (Helenium autumnale)

common sowthistle, sow-thistle, common sow-thistle, annual sowthistle, pualele, sow thistle (Sonchus oleraceus)

common spikerush, creeping spikeSpike:
Has a strong central axis (rachis) on which flowers or spikelets are directly attached (sessile), e.g. wheatgrasses.
-rush, marsh spikeSpike:
Has a strong central axis (rachis) on which flowers or spikelets are directly attached (sessile), e.g. wheatgrasses.
-rush (Eleocharis palustris)

common St. Johnswort, common St. John's wort, Klamathweed, Klamath weed, St. Johnswort, common St. Johnswort (Hypericum perforatum)

common sunflower (Helianthus annuus (cultivated))

common sunflower, sunflower, wild sunflower, annual sunflower (Helianthus annuus (wild))

common tansy, tansy, golden-buttons, hierba lombriguera, garden tansy (Tanacetum vulgare)

common velvetgrass, velvetgrass, Yorkshire fog (Holcus lanatus)

common viper's bugloss (Echium vulgare)

common water hyacinth (Eichhornia crassipes)

common wheat (Triticum aestivum )

common yarrow, milenrama, milfoil (Achillea millefolium)

common yellow oxalis, sheep sorrel, sourgrass, toad sorrel, yellow woodsorrel, erect woodsorrel, upright yellow wood-sorrel, upright yellow woodsorrel (Oxalis stricta)

compassplant (Silphium laciniatum)

composite dropseed, dropseed (Sporobolus compositus)

coriander (Coriandrum sativum)

corn (Zea mays)

corn chamomile (Anthemis arvensis)

corn gromwell (Buglossoides arvensis)

corn poppy (Papaver rhoeas)

corn speedwell, rock speedwell, wall speedwell, common speedwell (Veronica arvensis)

cosmopolitan bulrush (Bolboschoenus maritimus)

cotton (Gossypium hirsutum)

Coues' cassia, Coves' cassia, desert senna (Senna covesii)

Coulter's lupine (Lupinus sparsiflorus)

cowbag clover (Trifolium depauperatum)

cowpea (Vigna unguiculata)

cowpea witchweed, witchweed (Striga gesnerioides)

cow soapwort, cowcockle, field vaccaria (Vaccaria hispanica)

creeping barberry (Mahonia repens)

creeping bentgrass (Agrostis stolonifera)

creeping meadow foxtail (Alopecurus arundinaceus)

creosote bush (Larrea tridentata)

crested anoda (Anoda cristata)

crested dogstail grass (Cynosurus cristatus)

crested pricklypoppy (Argemone polyanthemos)

crested wheatgrass (Agropyron cristatum)

crimson clover (Trifolium incarnatum)

crooked clover (Trifolium angulatum)

crookneck squash, butternut squash, Tahitian squash, golden cushaw, calabaza, Dickinson pumpkin, neck pumpkin, West Indian pumpkin, Seminole pumpkin, large cheese pumpkin, Long Island cheese pumpkin, Kentucky field pumpkin, Tennessee sweet potato (Cucurbita moschata)

crossflower (Chorispora tenella)

crowded lupine (Lupinus confertus)

crowndaisy, garland chrysanthemum (Glebionis coronarium)

crownleaf eveningprimrose, crownleaf evening-primrose, crownleaf evening primrose (Oenothera coronopifolia)

crownvetch, purple crownvetch (Securigera varia)

Cuban jute, arrowleaf sida, escobilla, axocatzín, huinar (Sida rhombifolia)

cultivated endive (Cichorium endivia)

cultivated licorice (Glycyrrhiza glabra)

cultivated radish, radish, garden radish, wild radish (Raphanus sativus)

cultivated tobacco (Nicotiana tabacum)

Culver's root (Veronicastrum virginicum)

Cuman ragweed (Ambrosia psilostachya)

cumin (Cuminum cyminum)

cup plant, cup-plant, cupleaf rosinweed, squarestem rosinweed (Silphium perfoliatum)

cup-and-saucer-vine, Mexican-ivy, monastery-bells, cobée grimpante, klockranka (Cobaea scandens)

cupflower (Nierembergia sp.)

curly dock, narrowleaf dock, sour dock, yellow dock (Rumex crispus)

curlycup gumweed, curlytop gumweed, gumweed, rosinweed, tarweed (Grindelia squarrosa)

curlytop knotweed (Persicaria lapathifolia)

cusqui (Prosopis calingastana)

cutleaf coneflower, green-headHead:
An inflorescence of stalkless or nearly stalkless flowers attached to a common receptacle that often assumes the appearance of a single flower, but in fact may be a composite of many flowers, e.g. sunflower, clover.
coneflower (Rudbeckia laciniata)

cutleaf geranium (Geranium dissectum)

cutleaf nightshade, cut-leaf nightshade (Solanum triflorum)

cutleaf evening primrose (Oenothera laciniata)

cypress spurge (Euphorbia cyparissias)

D

Sacramento burbark, dadangsi, masiksik lahe, mosote, burweed (Triumfetta semitriloba)

white garlic, daffodil garlic (Allium neapolitanum)

dahlia (Dahlia sp.)

dallisgrass, herbe de miel, herbe sirop, hiku nua, palpalum dilate, water grass (Paspalum dilatatum)

Dalmatian toadflax (Linaria dalmatica)

dames rocket, dames violet, mother-of-the-evening (Hesperis matronalis)

green bulrush, dark-green bulrush (Scirpus atrovirens)

Darnel ryegrass (Lolium temulentum)

David's spurge (Euphorbia davidii)

deadly nightshade (Solanum interius)

deergrass, deer muhly (Muhlenbergia rigens)

deertongue (Dichanthelium clandestinum)

dendrobium (Dendrobium sp.)

dense blazing star (Liatris spicata)

Deptford pink, grass pink (Dianthus armeria)

desert broomrape, Cooper's broomrape (Orobanche cooperi)

desert ceanothus (Ceanothus greggii)

desert globemallow, apricot mallow (Sphaeralcea ambigua)

desert Indianwheat (Plantago ovata)

desert marigold, wooly marigold (Baileya multiradiata)

desert sand verbena (Abronia villosa)

desert willow (Chilopsis linearis)

desert zinnia, spinyleaf zinnia (Zinnia acerosa)

desert wheatgrass (Agropyron desertorum)

desertbells (Phacelia campanularia)

desertsenna, desert senna (Senna armata)

desert-thorn (Lycium sp.)

devil in the bush, love in a mist (Nigella damascena)

devil's beggartick (Bidens frondosa)

diamond burbark, burrBurr:
Has spikelets or flowers that are compressed closely together by lacking a central axis. The spikelet glumes are hard and pointed, e.g. buffalograss.
bush, Chinese burrBurr:
Has spikelets or flowers that are compressed closely together by lacking a central axis. The spikelet glumes are hard and pointed, e.g. buffalograss.
, dadangsi, masiksik lahe, mo'osipo, paroquet bur, diamond burrbark (Triumfetta rhomboidea)

diffuse knapweed, white knapweed (Centaurea diffusa)

dill (Anethum graveolens)

dixie signalgrass (Urochloa ramosa)

dixie ticktrefoil (Desmodium tortuosum)

dotted blazing star, dotted gayfeather (Liatris punctata)

dotted smartweed (Polygonum punctatum var. punctatum)

doubtful knight's-spur (Consolida ajacis)

Douglas' sagewort (Artemisia douglasiana)

dove weed (Croton setigerus)

Drummond's beeblossom (Oenothera hispida)

ducklettuce (Ottelia alismoides)

dudaim melon, pomegranate melon, Queen Anne's pocket melon, stink melon, Zier-Melone (Cucumis melo subsp. agrestis var. dudaim)

durum wheat (Triticum durum)

dvärgkrage (Coleostephus multicaulis)

dwarf cinquefoil (Potentilla canadensis)

dwarf morning-glory (Convolvulus tricolor)

Dyer's woad (Isatis tinctoria)

early yellowrocket (Barbarea verna)

E

East Indian lemongrass (Cymbopogon flexuosus)

eastern gamagrass (Tripsacum dactyloides)

Eastern Mojave buckwheat (Eriogonum fasciculatum)

eastern pasqueflower (Pulsatilla patens subsp. patens)

eastern purple coneflower (Echinacea purpurea)

edelweiss (Leontopodium nivale)

edging lobelia (Lobelia erinus)

eelkek, kohkihl, Molucca bramble, Molucca raspberry, soni, wa ngandrongandro, wild raspberry, wild blackberry (Rubus moluccanus)

eggleaf spurge (Euphorbia oblongata)

eggplant (Solanum melongena)

Egyptian broomrape (Orobanche aegyptiaca)

Egyptian clover (Trifolium alexandrinum)

Egyptian hartwort (Tordylium aegyptiacum)

einkhorn wheat (Triticum monococcum subsp. monococcum)

elecampane inula (Inula helenium)

elegant clarkia (Clarkia unguiculata)

elegant zinnia (Zinnia violacea)

elkweed, deer ears, green gentian, monument-plant, monument plant, showy frasera (Frasera speciosa)

elmleaf blackberry (Rubus ulmifolius)

Emory's baccharis (Baccharis emoryi)

Engelmann's daisy (Engelmannia peristenia)

English lavender (Lavandula angustifolia)

European columbine (Aquilegia vulgaris)

European field pansy, pansy violet, johnny-jump-up (Viola arvensis)

European pasqueflower (Pulsatilla vulgaris)

European stickseed (Lappula squarrosa)

European wallflower (Erysimum hieraciifolium)

European wand loosestrife (Lythrum virgatum)

evergreen candytuft (Iberis sempervirens)

eyebane (Chamaesyce nutans)

F

fading clover (Trifolium pallescens)

false daisy (Eclipta prostrata)

false flax, gold-of-pleasure (Camelina sativa)

false saw wort (Crupina crupinastrum)

farewell to spring (Clarkia amoena)

fava bean, horsebean (Vicia faba)

feathered mosquitofern (Azolla pinnata)

feathered pink, cottage pink, garden pink, laced pink (Dianthus plumarius)

fescue sedge (Carex festucacea)

feverfew (Tanacetum parthenium)

fiddle dock (Rumex pulcher)

field bindweed (Convolvulus arvensis)

field brome, Japanese brome (Bromus arvensis)

field clover, large hop clover, lesser hop clover, big hop clover, low hop clover (Trifolium campestre)

field mustard (Brassica rapa)

field paspalum (Paspalum laeve)

field pennycress, Frenchweed, pennycress, stinkweed, fanweed (Thlaspi arvense)

field pepperweed, cream-anther field pepperwort (Lepidium campestre)

field pumpkin, vegetable marrow, jack-o-lantern pumpkin, zucchini, cocozelle, citrouille (Cucurbita pepo)

field scabiosa (Knautia arvensis)

field sowthistle, field sow-thistle, sowthistle, creeping sowthistle, perennial sowthistle (Sonchus arvensis)

fineleaf sheep fescue (Festuca filiformis)

firecracker penstemon, Eaton's penstemon (Penstemon eatonii)

firetree (Morella faya)

fireweed, French-willow, great willowherb, rosebay willowherb, willowherb, (Chamerion angustifolium subsp. angustifolium)

fiveangled dodder (Cuscuta pentagona)

fivespot (Nemophila maculata)

flat pea (Lathyrus sylvestris)

flatsedge (Cyperus sp.)

flatspine stickseed, desert stickseed, western stickseed, flat-spine sheepburr (Lappula occidentalis var. occidentalis)

flax dodder (Cuscuta epilinum)

flaxleaf pimpernel (Anagallis monelli)

flower of an hour (Hibiscus trionum)

flowering flax (Linum grandiflorum)

flowering spurge (Euphorbia corollata)

foothill needlegrass, smallflower tussockgrass (Nassella lepida)

fountaingrass, tender fountain grass (Cenchrus setaceus)

fourwing saltbush (Atriplex canescens)

fowl bluegrass (Poa palustris)

fowl mannagrass (Glyceria striata)

fox sedge (Carex vulpinoidea)

foxglove beardtongue, talus slope penstemon (Penstemon digitalis)

foxtail barley (Hordeum jubatum)

foxtail millet, Italian bristle grass, Italian foxtail, foxtail bristlegrass (Setaria italica)

fragrant sage (Salvia clevelandii)

Fremont's goosefoot (Chenopodium fremontii)

French broom (Genista monspessulana)

French marigold (Tagetes patula)

fringed brome (Bromus ciliatus)

G

gallant soldier, small-flower galinsoga, littleflower quickweed, gallant-soldier, gallantsoldier (Galinsoga parviflora)

garden asparagus (Asparagus officinalis)

garden chervil (Anthriscus cerefolium)

garden cornflower (Centaurea cyanus)

garden cosmos (Cosmos bipinnatus)

garden cucumber (Cucumis sativus)

garden heliotrope (Heliotropium arborescens)

garden valerian, garden heliotrope (Valeriana officinalis)

garden leek (Allium porrum)

garden lettuce (Lactuca sativa)

garden lovage (Levisticum officinale)

garden mignonette (Reseda odorata)

garden onion (Allium cepa)

garden pea (Pisum sativum)

garden rhubarb (Rheum rhabarbarum)

garden snapdragon (Antirrhinum majus)

garden sorrel (Rumex acetosa)

garden thyme (Thymus vulgaris)

garden tomato (Solanum lycopersicum)

garden vetch, common vetch, tare, narrowleaf vetch (Vicia sativa)

garden vetch, blackpod vetch, narrowleaf vetch (Vicia sativa subsp. nigra)

garden yellowrocket (Barbarea vulgaris)

gardencress pepperweed (Lepidium sativum)

Gardner's saltbush (Atriplex gardneri)

gazania (Gazania sp.)

Geraldton carnation weed (Euphorbia terracina)

geranium (Pelargonium sp.)

German chamomile (Matricaria recutita)

German-madwort (Asperugo procumbens)

giant arrowhead, California arrowhead, Sagittaire spongieuse (Sagittaria montevidensis)

giant coreopsis (Coreopsis gigantea)

giant dropseed (Sporobolus giganteus)

giant false sensitive plant (Mimosa diplotricha)

giant hogweed (Heracleum mantegazzianum)

giant iris (Moraea ramosissima)

giant mealie witchweed (Striga forbesii)

giant woollystar, dense eriastrum (Eriastrum densifolium)

gilia penstemon, bush penstemon, gilia beardtongue (Penstemon ambiguus)

gladiolus (Gladiolus sp.)

glaucous bluegrass, white bluegrass (Poa glauca)

globe candytuft (Iberis umbellata)

glorytree (Tibouchina sp.)

golden crownbeard (Verbesina encelioides)

golden dock (Rumex maritimus)

golden false beardgrass (Chrysopogon aciculatus)

golden tickseed (Coreopsis tinctoria)

golden zizia (Zizia aurea)

gooseberryleaf globemallow, currant-leaf globemallow, gooseberry-leaf globemallow (Sphaeralcea grossulariifolia)

grain sorghum (Sorghum bicolor subsp. bicolor)

grannyvine (Ipomoea tricolor)

grazing brome (Bromus cebadilla)

greasewood, black greasewood (Sarcobatus vermiculatus)

great ragweed (Ambrosia trifida)

greater burdock (Arctium lappa)

greater yellow lady's slipper (Cypripedium parviflorum var. pubescens)

green bristlegrass, green bristle grass, bottle grass, pigeongrass, wild millet, green foxtail (Setaria viridis)

green needlegrass (Nassella viridula)

green spangletop, green sprangletop (Leptochloa dubia)

ground ivy (Glechoma hederacea)

guar, Calcutta-lucerne, cluster-bean, Siam-bean, (Cyamopsis tetragonoloba)

guineagrass (Megathyrsus maximus)

Gunnison's mariposa lily (Calochortus gunnisonii)

gypsyflower (Cynoglossum officinale)

H

hairy cat's ear (Hypochaeris radicata)

hairy clustervine, clustervine (Jacquemontia tamnifolia)

hairy crabgrass (Digitaria sanguinalis)

hairy false goldenaster (Heterotheca villosa)

hairy indigo (Indigofera hirsuta)

hairy sedge (Carex lacustris)

hairy whitetop (Cardaria pubescens)

hairyfruit chervil (Chaerophyllum tainturieri)

halberdleaf rosemallow (Hibiscus laevis)

hard fescue (Festuca trachyphylla)

hardheads (Rhaponticum repens)

bulbous canarygrass, Harding grass (Phalaris aquatica)

hardstem bulrush, Schoenoplectus (Schoenoplectus acutus)

hare's ear mustard (Conringia orientalis)

harmal peganum, African rue, harmal shrub, harmel, isband, ozallaik, peganum, steppenraute, Syrian rue (Peganum harmala)

heartleaf hempvine, mile-a-minute (Mikania cordata)

heartshape false pickerelweed (Monochoria vaginalis)

hedge false bindweed (Calystegia sepium)

hedgemustard, hedge tumblemustard, hedgeweed, hairypod hedgemustard, wild mustard (Sisymbrium officinale)

hedgehog cactus (Echinocereus sp.)

hei shuo (Alectra sessiliflora)

Heldreich's clover (Trifolium heldreichianum)

hellroot, small broomrape (Orobanche minor)

henbit deadnettle, common henbit, henbit, giraffehead (Lamium amplexicaule)

hen eggs clover (Trifolium trichocephalum)

herb sophia (Descurainia sophia)

high-plains beeblossom, woolly beeblossom (Oenothera cinerea)

higuillo de hoja menuda, spiked pepper (Piper aduncum)

hillock bush (Melaleuca hypericifolia)

Himalayan blackberry (Rubus armeniacus)

hispanic crambe (Crambe hispanica)

hispid starbur (Acanthospermum hispidum)

hoary alyssum, hoary false madwort (Berteroa incana)

hoary plantain, lanceleaf plantain (Plantago media)

hoary verbena, tall vervain, woolly verbena, hoary vervain (Verbena stricta)

hoaryleaf ceanothus (Ceanothus crassifolius)

hoe nightshade, ground-cherry nightshade, hairy nightshade (Solanum physalifolium)

hollowleaf annual lupine, bigleaf lupine (Lupinus succulentus)

hollyhock, Antwerp hollyhock (Alcea rosea)

honeylocust, common honeylocust, honey locust (Gleditsia triacanthos)

honeyvine (Cynanchum laeve)

honeywort (Cerinthe major)

hop sedge (Carex lupulina)

horehound (Marrubium vulgare)

horned violet (Viola cornuta)

horsetail milkweed (Asclepias subverticillata)

Hungarian clover (Trifolium pannonicum)

Hungarian vetch (Vicia pannonica)

hyacinthbean (Lablab purpureus)

hyssop (Hyssopus officinalis)

I

Iberian knapweed (Centaurea iberica)

Icelandic poppy, Arctic poppy (Papaver nudicaule)

Idaho fescue (Festuca idahoensis)

Illinois bundleflower (Desmanthus illinoensis)

immortelle (Xeranthemum annuum)

Indian blanket, firewheel (Gaillardia pulchella)

Indian goosegrass, goose grass, manienie ali'i, wiregrass (Eleusine indica)

Indian jointvetch (Aeschynomene indica)

Indian paintbrush, paintbrush, painted-cup (Castilleja sp.)

Indian ricegrass (Achnatherum hymenoides)

Indian rushpea (Hoffmannseggia glauca)

Indian swampweed (Hygrophila polysperma)

Indiangrass, yellow Indian-grass (Sorghastrum nutans)

intermediate wheatgrass (Thinopyrum intermedium)

Irish potato (Solanum tuberosum)

Italian plumeless thistle (Carduus pycnocephalus)

Italian ryegrass, annual ryegrass(Lolium perenne subsp. multiflorum)

itchgrass (Rottboellia cochinchinensis)

ivy broomrape (Orobanche hederae)

ivy gourd (Coccinia grandis)

ivyleaf morning-glory (Ipomoea hederacea)

J

Jack in the bush, ngesngesil (Chromolaena odorata)

Jack-go-to-bed-at-noon, Oyster plant salsify (Tragopogon pratensis)

Jamaican crabgrass (Digitaria horizontalis)

James' galleta, galleta (Pleuraphis jamesii)

Japanese bristlegrass, tall green bristlegrass, Chinese foxtail, Chinese millet, giant bristlegrass, nodding foxtail, giant foxtail (Setaria faberi)

Japanese clover (Kummerowia striata)

Japanese dodder (Cuscuta japonica)

Japanese knotweed (Polygonum cuspidatum)

Java-bean, sicklepod (Senna obtusifolia)

Jerusalem thorn, Mexican palo verde, Jerusalem-thorn, retama (Parkinsonia aculeata)

jeweled distaff thistle, wild safflower (Carthamus oxyacanthus)

jimmyweed (Isocoma veneta)

jimsonweed (Datura stramonium)

jio (Commelina benghalensis)

Johnsongrass, aleppo milletgrass, herbe de Cuba, sorgho d'Alep, sorgo de alepo, zacate Johnson (Sorghum halepense)

Jointed goatgrass (Aegilops cylindrica)

juncea lespedeza (Lespedeza juncea)

jungle rice (Echinochloa colona)

K

kahiliflower (Grevillea banksii)

kal maurandia (Maurandya scandens)

kariba-weed (Salvinia molesta)

Kentucky bluegrass (Poa pratensis)

Kenya clover (Trifolium semipilosum)

khakiweed (Alternanthera pungens)

kiawe (Prosopis pallida)

kidney bean (Phaseolus vulgaris)

kikuyugrass (Pennisetum clandestinum)

kill weed (Cuscuta hyalina)

kiss me over the garden gate (Polygonum orientale)

kitchen sage (Salvia officinalis)

kleingrass, klinegrass (Panicum coloratum)

kodomillet, ricegrass paspalum, ricegrass, kodo-millet (Paspalum scrobiculatum)

kohlrabi (Brassica oleracea var. gongylodes)

Korean clover, Korean lespedeza (Kummerowia stipulacea)

kudzu, nepalem, wa yaka, acha, aka, Japanese arrowroot (Pueraria montana var. lobata)

Kura clover (Trifolium ambiguum)

L

lady's-mantle (Alchemilla mollis)

lambsquarters (Chenopodium album)

lanceleaf sage, blue sage, lambsleaf sage, Rocky Mountain sage, sage mint (Salvia reflexa)

lanceleaf tickseed (Coreopsis lanceolata)

lappelm (Elymus mutabilis)

large beardtongue, largeflowered penstemon (Penstemon grandiflorus)

large bullwort (Ammi majus)

large Indian breadroot, Indian breadroot, breadroot scurfpea (Pediomelum esculentum)

large yellow vetch (Vicia grandiflora)

largebracted plantain, bottlebrush Indianwheat (Plantago aristata)

largeflower evening primrose, largeflower evening-primrose (Oenothera grandiflora)

lawndaisy (Bellis perennis)

lawngrass (Zoysia)

leadplant (Amorpha canescens)

leafy spurge (Euphorbia esula)

Lehmann lovegrass (Eragrostis lehmanniana)

Leiberg's panicum (Dichanthelium leibergii)

lemon beebalm, lemon mint (Monarda citriodora)

lenspod whitetop (Cardaria chalepensis)

lentil (Lens culinaris)

lentil vetch, slender vetch, sparrow vetch (Vicia tetrasperma)

lesser burdock (Arctium minus)

lesser calamint (Calamintha nepeta)

lesser knapweed (Centaurea nigra)

Lewis flax (Linum lewisii)

lilacbell, purple moonflower (Ipomoea turbinata)

lilacbush (Aubrieta deltoidea)

lindenleaf sage (Salvia tiliifolia)

Lindheimer's beeblossom (Oenothera lindheimeri)

Lindley's blazingstar (Mentzelia lindleyi)

little barley, little wildbarley (Hordeum pusillum)

little bluestem (Schizachyrium scoparium)

little evening primrose, little evening-primrose (Oenothera perennis)

little hogweed (Portulaca oleracea)

little larkspur (Delphinium bicolor)

little sagebrush (Artemisia arbuscula subsp. arbuscula)

littleleaf buttercup, kidney-leaf buttercup, early woodbuttercup, smallflower buttercup, smallflower crowfoot (Ranunculus abortivus)

littleleaf leadtree (Leucaena retusa)

littlepod false flax (Camelina microcarpa)

littleseed muhly (Muhlenbergia microsperma)

littleseed ricegrass (Piptatheropsis micrantha)

Livingstone daisy, tapis magique, Garten-Mittagsblume, stor doroteablomma (Cleretum bellidiforme)

lobelia (Lobelia sp.)

longbeak rattlebox (Crotalaria longirostrata)

longhair sedge (Carex comosa)

longleaf groundcherry (Physalis longifolia var. subglabrata)

longstamen rice (Oryza longistaminata)

loose silkybent (Apera spica-venti)

Louisiana cupgrass (Eriochloa punctata)

low baby's-breath (Gypsophila muralis)

low mallow (Malva pusilla)

lupine clover (Trifolium lupinaster)

M

Madagascar periwinkle (Catharanthus roseus)

madanaghanti (Spermacoce articularis)

maiden pink, meadow pink (Dianthus deltoides)

maidenhair tree, common ginkgo (Ginkgo biloba)

Malabar melastome (Melastoma malabathricum)

Maltese star-thistle (Centaurea melitensis)

maltesecross (Silene chalcedonica)

mammoth wildrye, Volga wildrye (Leymus racemosus)

mammoth wildrye (Leymus racemosus subsp. racemosus)

marigold (Calendula sp.)

marijuana (Cannabis sativa)

marsh bristlegrass, knotroot bristlegrass, yellow bristlegrass (Setaria parviflora)

marsh hedgenettle (Stachys palustris)

marshpepper knotweed (Polygonum hydropiper)

marvel of Peru, common four o'clock (Mirabilis jalapa)

mat sandbur (Cenchrus longispinus)

Maximilian sunflower (Helianthus maximiliani)

meadow barley (Hordeum brachyantherum subsp. brachyantherum)

meadow brome (Bromus biebersteinii)

meadow deathcamas (Toxicoscordion venenosus)

meadow fescue (Schedonorus pratensis)

meadow foxtail (Alopecurus pratensis)

meadow garlic (Allium canadense (bulb))

meadow garlic (Allium canadense)

mealycup sage (Salvia farinacea)

Mediterranean sage, African sage (Salvia aethiopis)

medusahead, medusahead rye (Taeniatherum caput-medusae)

mesquite (Prosopis juliflora)

mesquite (Prosopis ruscifolia)

Mexican cliffrose (Purshia mexicana)

Mexican creeping zinnia (Sanvitalia procumbens)

Mexican fireplant, kaliko, spurge (Euphorbia heterophylla)

Mexican tea, Mexican-Tea (Dysphania ambrosioides)

Mexican teosinte (Zea mexicana)

Mexican zinnia (Zinnia haageana)

mibuna, mizuna (Brassica rapa subsp. nipposinica)

mile-a-minute, bittervine, Chinese creeper, kwalo koburu, liane americaine, ovaova, wa mbosuvu (Mikania micrantha)

miner's candle (Cryptantha virgata)

mission grass (Pennisetum polystachion)

Missouri gourd, calabazilla, wild gourd, wild pumpkin, buffalo gourd, buffalogourd pumpkin, foetid gourd (Cucurbita foetidissima)

monkeyflower (Mimulus sp.)

mooncactus (Harrisia martinii)

mormon tea (Ephedra viridis)

morning-glory (Ipomoea sp.)

Moroccan toadflax (Linaria maroccana)

mother of thyme (Thymus praecox)

mountain brome (Bromus marginatus)

mountain clover (Trifolium montanum)

mountain deathcamas (Anticlea elegans)

mountain muhly (Muhlenbergia montana)

mourningbride (Scabiosa atropurpurea)

mucronate sprangletop (Leptochloa panicea subsp. brachiata)

mule-ears, mulesear wyethia (Wyethia amplexicaulis)

multiflora rose (Rosa multiflora)

mung bean (Vigna radiata)

muster John Henry, wild marigold, marigold, stinkweed (Tagetes minuta)

myrtle spurge (Euphorbia myrsinites)

N

naked oat (Avena nuda)

Napa bluegrass (Poa napensis)

narrowleaf dock (Rumex stenophyllus)

narrowleaf goosefoot (Chenopodium leptophyllum)

narrowleaf purple coneflower (Echinacea angustifolia var. angustifolia)

narrowleafed milkvetch (Astragalus pectinatus)

narrow-leaved witchweed (Striga angustifolia)

nasturtium (Tropaeolum majus)

needle and thread (Hesperostipa comata)

needle grama (Bouteloua aristidoides)

nemesia (Nemesia sp.)

Nepal cinquefoil (Potentilla nepalensis)

Nevada jointfir (Ephedra nevadensis)

New England aster (Symphyotrichum novae-angliae)

New York ironweed (Vernonia noveboracensis)

New Zealand spinach (Tetragonia tetragonioides)

nigella (Nigella sp.)

nightflowering silene, sticky cockle Silene noctiflora)

nodding beggartrick, nodding bur-marigold (Bidens cernua)

nodding brome (Bromus anomalus)

nodding broomrape (Orobanche cernua)

nodding catchfly (Silene pendula)

nodding fescue (Festuca subverticillata)

nodding lady's tresses, white nodding ladies'-tresses, common ladies' tresses (Spiranthes cernua)

nodding needlegrass, nodding tussockgrass (Nassella cernua)

nodding onion (Allium cernuum)

nodding plumeless thistle (Carduus nutans)

narrowleaf plantain, buckhorn plantain, English plantain, lanceleaf Indianwheat, lanceleaf plantain, ribgrass, ribwort (Plantago lanceolata)

North Africa grass, ventenata (Ventenata dubia)

northern reedgrass (Calamagrostis stricta subsp. inexpansa)

northern singlespike sedge (Carex scirpoidea)

Northwest Territory sedge (Carex utriculata)

Norwegian angelica (Angelica archangelica)

Norwegian cinquefoil (Potentilla norvegica)

nutgrass (Cyperus rotundus)

Nuttall's violet, yellow prairie violet (Viola nuttallii)

O

okra (Abelmoschus esculentus)

oneseed bur cucumber, bur cucumber, wall bur cucumber, sicyos anguleux, nimble-Kate, star cucumber (Sicyos angulatus)

onionweed (Asphodelus fistulosus)

open clover (Trifolium apertum)

orange hawkweed (Hieracium aurantiacum)

orchardgrass (Dactylis glomerata)

oregano (Origanum vulgare)

Oriental knight's-spur (Consolida orientalis)

Oriental poppy (Papaver orientale)

Oriental virginsbower (Clematis orientalis)

ovateOvate:
Egg-shaped with basal end the broadest.
goatgrass (Aegilops geniculata)

owl-headHead:
An inflorescence of stalkless or nearly stalkless flowers attached to a common receptacle that often assumes the appearance of a single flower, but in fact may be a composite of many flowers, e.g. sunflower, clover.
clover, purple-globe clover (Trifolium alpestre)

owl's-claws (Hymenoxys hoopesii)

ox-eye daisy, Cape marigold, Namaqualand daisy, African daisy (Dimorphotheca tragus)

oxeye daisy (Leucanthemum vulgare)

oxtongue broomrape (Orobanche artemisiae-campestris)

oxygen-weed (Lagarosiphon major)

bigfruit evening primrose, Ozark sundrop (Oenothera macrocarpa)

P

painted tongue (Salpiglossis sinuata)

pale dock, smooth dock (Rumex altissimus)

pale spikerush (Eleocharis macrostachya)

Palmer's penstemon (Penstemon palmeri)

panic liverseed grass, liveseed grass, liverseed grass (Urochloa panicoides)

panicled bulrush, red-tinge bulrush, smallfruit bulrush (Scirpus microcarpus)

papaya (Carica papaya)

parsley (Petroselinum crispum)

partridge pea (Chamaecrista fasciculata)

peanut (Arachis hypogaea)

pearl millet (Pennisetum glaucum)

Pennsylvania smartweed (Polygonum pensylvanicum)

peppermint (Mentha × piperita)

pennyroyal, peppermint (Mentha pulegium)

perennial pea (Lathyrus latifolius)

perennial rye grass, perennial ryegrass, Italian ryegrass (Lolium perenne)

Persian ryegrass (Lolium persicum)

Peruvian dodder (Cuscuta obtusiflora)

petunia (Petunia sp.)

pigeonpea (Cajanus cajan)

pignut, mumutun, wild spikenard (Hyptis suaveolens)

pigweed (Amaranthus sp.)

pincushions (Scabiosa sp.)

Pine Hill flannelbush (Fremontodendron decumbens)

pineywoods geranium, purple cluster geranium, tufted geranium (Geranium caespitosum)

pink queen, spider-flower, spiderplant (Cleome hassleriana)

pinkladies, showy eveningprimrose (Oenothera speciosa)

pinnate prairie coneflower, grayhead prairieconeflower (Ratibida pinnata)

pitcher sage, blue sage (Salvia azurea var. grandiflora)

pitseed goosefoot (Chenopodium berlandieri)

plains blackfoot, plains blackfoot daisy (Melampodium leucanthum)

plains prickly pear (Opuntia polyacantha)

poison hemlock (Conium maculatum)

Polish wheat (Triticum polonicum)

polkadot-plant (Hypoestes phyllostachya)

ponderosa pine, bull pine, western yellow pine, blackjack pine, rock pine (Pinus ponderosa)

poorjoe (Diodia teres)

poorman's orchid (Schizanthus pinnatus)

porcupinegrass (Hesperostipa spartea)

poverty rush, field rush, path rush, slender yard rush, wiregrass, slender rush (Juncus tenuis)

povertyweed, deer-root, poverty sumpweed, lesser marshelder, mouseear povertyweed, poverty weed, smallflowered marshelder (Iva axillaris)

prairie blazing star, cat-tail gayfeather, Kansas gayfeather (Liatris pycnostachy)

prairie cordgrass (Spartina pectinata)

prairie dropseed, northern dropseed (Sporobolus heterolepis)

prairie fleabane (Erigeron strigosus)

prairie goldenrod, white flat-top goldenrod, upland white aster, verge-d'or faux-ptarmica (Oligoneuron album)

prairie ironweed, western ironweed (Vernonia fasciculata)

prairie Junegrass, Junegrass (Koeleria macrantha)

prairie rosinweed (Silphium terebinthinaceum)

prairie sagewort (Artemisia frigida)

prairie sandreed (Calamovilfa longifolia)

prairie sunflower, showy sunflower (Helianthus petiolaris)

prickly fanpetals, prickly sida, false mallow, Indian mallow, prickly mallow (Sida spinosa)

prickly Russian thistle, tumbleweed (Salsola tragus)

primrose (Primula sp.)

Prince-of-Wales feather (Amaranthus hypochondriacus)

professor-weed (Galega officinalis)

prostrate knotweed, yard knotweed (Polygonum aviculare)

prostrate pigweed, tumble pigweed, tumbleweed (Amaranthus albus)

prostrate sandmat, blue weed, ground spurge, prostrate spurge, spurge (Chamaesyce prostrata)

puffsheath dropseed, small dropseed (Sporobolus neglectus)

puna grass (Amelichloa brachychaeta)

puncturevine, bullhead, caltrop, Mexican sandbur, Texas sandbur, goathead (Tribulus terrestris)

punktree, cajeput, paperbark (Melaleuca quinquenervia)

purple avens (Geum rivale)

purple bell vine (Rhodochiton atrosanguineus)

purple Chinese houses (Collinsia heterophylla)

purple foxglove (Digitalis purpurea)

purple locoweed, stemless loco, white woollyloco, whitepoint locoweed, Lambert's crazyweed, Lambert's locoweed, purple loco (Oxytropis lambertii)

purple loosestrife (Lythrum salicaria)

purple meadow-rue (Thalictrum dasycarpum)

purple needlegrass, purple tussockgrass (Nassella pulchra)

purple passionflower (Passiflora incarnata)

purple poppymallow (Callirhoe involucrata)

purple prairie clover (Dalea purpurea)

purple vetch (Vicia benghalensis)

purple witchweed, witchweed (Striga hermonthica)

purplestem angelica (Angelica atropurpurea)

purpletop tridens, purpletop (Tridens flavus)

purpletop vervain, pretty verbena (Verbena bonariensis)

Q

quackgrass (Elymus repens)

Queen Anne's lace (Daucus carota)

Queen Anne's lace, wild carrot (Daucus carota var. carota)

quinoa (Chenopodium quinoa)

R

rabbitfoot clover, hare's foot clover, oldfield clover, stone clover, hairy clover, rabbit-foot clover (Trifolium arvense)

raceme catnip (Nepeta racemosa)

rampion bellflower (Campanula rapunculoides)

ramtilla (Guizotia abyssinica)

rape (Brassica napus)

rat-tail fescue, rat-tailed fescue, rattail fescue, foxtail fescue (Vulpia myuros)

ravenfoot sedge (Carex crus-corvi)

rayless goldenhead (Acamptopappus sphaerocephalus)

red amaranth (Amaranthus cruentus)

red bartsia (Odontites vernus subsp. serotinus)

red catchfly, red campion (Silene dioica)

red clover (Trifolium pratense)

red columbine (Aquilegia canadensis)

red fescue, ravine fescue (Festuca rubra)

Douglas-fir, red fir, Douglas spruce, Oregon pine (Pseudotsuga menziesii)

red maple (Acer rubrum)

red melastome (Melastoma sanguineum)

red rice (Oryza punctata)

red sandspurry, purple sandspurry (Spergularia rubra)

red star-thistle (Centaurea calcitrapa)

red trefoil (Trifolium rubens)

redberry buckthorn, hollyleaf buckthorn (Rhamnus crocea)

redheart (Ceanothus spinosus)

redhot poker (Kniphofia uvaria)

redroot amaranth (Amaranthus retroflexus)

redspot clarkia (Clarkia speciosa)

redstem stork's bill (Erodium cicutarium)

redtop (Agrostis gigantea)

reed canarygrass, reed canary grass (Phalaris arundinacea)

rescue grass, prairie grass, Schrader's bromegrass (Bromus catharticus var. catharticus)

resinbush, skeletonleaf goldeneye (Viguiera stenoloba)

Rhodes grass (Chloris gayana)

rice (Oryza sativa)

Riddell's goldenrod (Oligoneuron riddellii)

Rio Grande globe amaranth (Gomphrena haageana)

ripgut brome (Bromus diandrus spp. rigidus)

river bulrush (Bolboschoenus fluviatilis)

rivet wheat, Emmer(Triticum turgidum)

roadside agrimony (Agrimonia striata)

rock dandelion (Taraxacum laevigatum)

rock soapwort (Saponaria ocymoides)

Rocky Mountain iris, wild iris, western blue flag, wildiris (Iris missouriensis)

Rocky Mountain penstemon, Rocky Mountain beardtongue (Penstemon strictus)

Roman chamomile (Chamaemelum nobile)

rose blackberry (Rubus rosaceus)

rose clover (Trifolium hirtum)

rose myrtle, downy myrtle(Rhodomyrtus tomentosa)

rosemallow (Hibiscus sp.)

rosemary, romero (Rosmarinus officinalis)

Rothrock's grama (Bouteloua rothrockii)

rough avens (Geum laciniatum)

rough bluegrass (Poa trivialis)

rough cocklebur, Canada cocklebur, cocklebur, common cocklebur, rough cockleburr, cockleburr (Xanthium strumarium)

rough dropseed (Sporobolus clandestinus)

rough Mexican clover (Richardia scabra)

rough pricklypoppy (Argemone hispida)

roughfruit corn bedstraw (Galium tricornutum)

roundhead lespedeza (Lespedeza capitata)

rufous bulrush, hanging bulrush, pendulous bulrush (Scirpus pendulus)

rubber rabbitbrush (Ericameria nauseosa)

rush skeletonweed (Chondrilla juncea)

Russian thistle (Salsola kali)

Russian wildrye (Psathyrostachys juncea)

rutabaga, swede, Swedish turnip (Brassica napus subsp. rapifera)

Rydberg's penstemon, meadow beardtongue (Penstemon rydbergii)

rye brome (Bromus secalinus)

S

sacred thorn-apple (Datura wrightii)

safflower (Carthamus tinctorius)

sainfoin, common sainfoin (Onobrychis viciifolia)

salad burnet, small burnet (Sanguisorba minor)

salmonberry (Rubus spectabilis)

salsify, purple salsify, common salsify, goatsbeard (Tragopogon porrifolius)

saltgrass (Distichlis spicata)

saltlover, barilla (Halogeton glomeratus)

San Diego County viguiera, San Diego-sunflower (Bahiopsis laciniata)

San Luis purple sage (Salvia leucophylla)

sand bluestem (Andropogon hallii)

sand dropseed (Sporobolus cryptandrus)

sand lovegrass (Eragrostis trichodes)

Sandberg bluegrass, big bluegrass, Sandberg's bluegrass (Poa secunda)

sanddune wallflower (Erysimum capitatum)

sandwort drymary (Drymaria arenarioides)

Santa Barbara ceanothus (Ceanothus impressus)

sawsepal penstemon, western smooth beardtongue (Penstemon glaber)

sawtooth blackberry, prickly Florida blackberry (Rubus argutus)

scaldweed (Cuscuta gronovii)

scarlet beebalm, Oswego tea, monarde écarlate (Monarda didyma)

scarlet globemallow, copper mallow, red falsemallow, orange globemallow (Sphaeralcea coccinea)

scarlet pimpernel, poor man's weather glass, Scarlet Yellow-Loosestrife (Anagallis arvensis)

scarlet runner (Phaseolus coccineus)

scarlet sage (Salvia splendens)

scentless false mayweed (Tripleurospermum perforatum)

Scotch broom (Cytisus scoparius)

Scotch cottonthistle, cotton thistle, heraldic thistle, Scotch cotton thistle, Scotch thistle (Onopordum acanthium)

scrambling nightshade, aquatic soda apple, wetland nightshade (Solanum tampicense)

seaside arrowgrass, troscart maritime, arrow-grass (Triglochin maritima)

sensitive partridge pea, sensitive plant (Chamaecrista nictitans)

sericea lespedeza (Lespedeza cuneata)

serrate spurge (Euphorbia serrata)

serrated tussock grass, serrated tussock (Nassella trichotoma)

sesame (Sesamum orientale)

sessileSessile:
A flower or spikelet with no pedicel therefore attached directly to the central axis (rachis) or other surfaces.
joyweed, okulabeluulechad (Palau) (Alternanthera sessilis)

shaggy soldier, fringed quickweed (Galinsoga quadriradiata)

shale barren evening primrose (Oenothera argillicola)

shameplant (Mimosa pudica)

Shasta daisy (Leucanthemum × superbum)

sheep fescue (Festuca ovina)

shellflower (Moluccella laevis)

shepherd's purse, shepherd's-purse (Capsella bursa-pastoris)

sherardia (Sherardia sp.)

shining spurge (Euphorbia lucida)

shortpod mustard (Hirschfeldia incana)

Short's sedge (Carex shortiana)

showy baby's-breath (Gypsophila elegans)

showy goldeneye (Heliomeris multiflora)

showy milkweed (Asclepias speciosa)

showy orchid, showy orchis (Galearis spectabilis)

showy penstemon (Penstemon spectabilis)

showy prairie gentian (Eustoma exaltatum subsp. russellianum)

showy rattlebox, rattlebox, showy crotalaria (Crotalaria spectabilis)

shrubby Russian thistle, wormleaf salsola (Salsola vermiculata)

Siberian kale (Brassica napus var. pabularia)

Siberian wheatgrass (Agropyron fragile)

sickle senna (Senna tora)

sicklefruit fenugreek (Trigonella foenum-graecum)

sicklekeel lupine (Lupinus albicaulis)

sideoats grama (Bouteloua curtipendula)

Sierra larkspur (Delphinium glaucum)

sieva bean (Phaseolus lunatus)

silky kangaroo grass, Lyon's grass (Themeda villosa)

silver cock's comb, crested cock's comb (Celosia argentea)

silver hairgrass (Aira caryophyllea)

silver senna (Senna artemisioides)

silver cinquefoil (Potentilla argentea)

silverleaf nightshade, tomato weed, trompillo, white horsenettle, white nightshade (Solanum elaeagnifolium)

silversheath knotweed, Persian knotweed (Polygonum argyrocoleon)

silvery lupine (Lupinus argenteus)

silvery lupine (Lupinus argenteus subsp. rubricaulis)

simplestem bur-reed, branched burreed, exotic bur-reed (Sparganium erectum)

sixweeks fescue, pullout grass, sixweeks grass, eight-flower six-weeks grass (Vulpia octoflora)

sixweeks threeawn (Aristida adscensionis)

skeletonleaf bur ragweed (Ambrosia tomentosa)

skunkbush sumac, ill-scented sumac, fragrant sumac, sumac aromatique variété aromatique (Rhus trilobata var. trilobata)

skyblue aster (Symphyotrichum oolentangiense)

sleepy silene, catchfly, sleepy catchfly, sleepy campion (Silene antirrhina)

slender fimbry (Fimbristylis autumnalis)

slender meadow foxtail (Alopecurus myosuroides)

slender oat (Avena barbata)

slender Russian thistle, tumbleweed (Salsola collina)

slender wheatgrass (Elymus trachycaulus)

slimflower scurfpea, scurfpea (Psoralidium tenuiflorum)

small fescue, twoflower fescue, little fescue (Vulpia microstachys)

small tumbleweed mustard, false London rocket, tallhedge mustard, tall hedgemustard (Sisymbrium loeselii)

small white clover (Trifolium nigrescens)

smallflower melicgrass (Melica imperfecta)

smooth barley (Hordeum murinum subsp. glaucum)

smooth blue aster (Symphyotrichum laeve)

smooth brome (Bromus inermis subsp. inermis)

smooth crabgrass (Digitaria ischaemum)

smooth distaff thistle (Carthamus creticus)

smooth hawksbeard (Crepis capillaris)

smooth oxeye (Heliopsis helianthoides)

smooth rattlebox, pikakan, salts rattlebox, smooth crotalaria, smooth rattlepod, striped crotalaria, (Crotalaria pallida)

smooth sumac, sumac glabre (Rhus glabra)

snow on the mountain (Euphorbia marginata)

snowdrop windflower (Anemone sylvestris)

soapbush, Koster's curse, kui (Clidemia hirta)

soft brome, soft chess (Bromus hordeaceus)

soft elephantsfoot (Elephantopus mollis)

softstem bulrush, great bulrush, soft-stem bulrush (Schoenoplectus tabernaemontani)

sorghum (Sorghum)

South American tobacco (Nicotiana sylvestris)

southern bush monkeyflower (Diplacus longiflorus)

southern dewberry (Rubus trivialis)

southern sandbur, burr grass, common sandbur, sandbur, 'ume'alu (Cenchrus echinatus)

southern threecornerjack, three-cornered jack (Emex australis)

soybean, reseeding soybean, wild soybean (Glycine max)

Spanish broom, weaver's broom (Spartium junceum)

Spanish needles (Bidens bipinnata)

spearmint, bush mint (Mentha spicata)

spelt (Triticum spelta)

spiderwort, spider-lily (Tradescantia sp.)

spikeSpike:
Has a strong central axis (rachis) on which flowers or spikelets are directly attached (sessile), e.g. wheatgrasses.
bentgrass (Agrostis exarata)

spiked muhly, bristly muhly, marsh muhly (Muhlenbergia glomerata)

spiked speedwell (Veronica spicata)

spinach (Spinacia oleracea)

spinySpiny:
slender, stiff, sharp projections oriented in the general plane of the structure
cocklebur, Bathurst burrBurr:
Has spikelets or flowers that are compressed closely together by lacking a central axis. The spikelet glumes are hard and pointed, e.g. buffalograss.
, cocklebur, spinySpiny:
slender, stiff, sharp projections oriented in the general plane of the structure
cockleburr (Xanthium spinosum)

spinySpiny:
slender, stiff, sharp projections oriented in the general plane of the structure
hopsage (Grayia spinosa)

spinySpiny:
slender, stiff, sharp projections oriented in the general plane of the structure
medick (Medicago murex)

spinySpiny:
slender, stiff, sharp projections oriented in the general plane of the structure
plumeless thistle (Carduus acanthoides)

spinySpiny:
slender, stiff, sharp projections oriented in the general plane of the structure
threecornerjack, devil's thorn (Emex spinosa)

spinySpiny:
slender, stiff, sharp projections oriented in the general plane of the structure
sowthistle, prickly sow thistle, prickly sowthistle, spinySpiny:
slender, stiff, sharp projections oriented in the general plane of the structure
-leaf sow-thistle, perennial sowthistle (Sonchus asper)

spiritweed (Eryngium foetidum)

splitbeard bluestem (Andropogon ternarius)

spotted beebalm (Monarda punctata)

spotted joe pye weed, spotted trumpetweed (Eutrochium maculatum)

spotted knapweed, centaurée maculée ou tachetée, kleinköpfige Rispen-Flockenblume, centáurea-manchada (Centaurea australis)

spotted ladysthumb (Polygonum persicaria)

spotted sandmat (Chamaesyce maculata)

spotted snapweed (Impatiens balsamina)

spotted water hemlock (Cicuta maculata)

spreadfruit goldenbanner, prairie thermopsis, goldenpea (Thermopsis divaricarpa)

spreading snakeroot (Ageratina riparia)

spreading wallflower (Erysimum repandum)

spreading windmill grass (Chloris divaricata)

Sprenger's asparagus fern (Asparagus aethiopicus)

squarrose knapweed (Centaurea virgata subsp. squarrosa)

squirreltail (Elymus elymoides)

standing-cypress, Texas plume (Ipomopsis rubra)

star fenugreek (Trigonella stellata)

sticky purple geranium, sticky geranium (Geranium viscosissimum)

sticky snakeroot (Ageratina adenophora)

stickywilly, Marin County bedstraw (Galium aparine)

stiff goldenrod (Oligoneuron rigidum var. rigidum)

stiff greenthread, plains greenthread, greenthread (Thelesperma filifolium)

stiff tickseed (Coreopsis palmata)

stinging nettle, California nettle, slender nettle, tall nettle (Urtica dioica)

stinkgrass (Eragrostis cilianensis)

stinking chamomile (Anthemis cotula)

stinking willie (Senecio jacobaea)

strawberry clover (Trifolium fragiferum)

strawberry groundcherry (Physalis alkekengi)

strawberry (Fragaria sp.)

streambed bristlegrass, bristlegrass, yellow bristlegrass, Plains bristlegrass, yellow foxtail (Setaria leucopila)

sturdy bullrush (Bolboschoenus robustus)

subterranean clover (Trifolium subterraneum)

suckling clover, hop clover, smallhop clover (Trifolium dubium)

Sudangrass, chicken-corn, sordan, shattercane (Sorghum bicolor nothosubsp. drummondii)

sugarcane (Saccharum officinarum)

sulla (Hedysarum coronarium)

sulphur cinquefoil (Potentilla recta)

sulphur clover (Trifolium ochroleucum)

sulphur cosmos (Cosmos sulphureus)

sulphur knapweed (Centaurea sulphurea)

sulphur-flower buckwheat (Eriogonum umbellatum)

summer savory (Satureja hortensis)

sundial lupine (Lupinus perennis)

supine bluegrass (Poa supina)

swamp milkweed (Asclepias incarnata)

swamp morning-glory, water spinach, Chinese waterspinach (Ipomoea aquatica)

swamp paperbark (Melaleuca ericifolia)

swamp verbena, blue vervain, blue verbena, Simpler's-joy (Verbena hastata)

Swan River daisy (Brachyscome iberidifolia)

sweet alyssum (Lobularia maritima)

sweet basil (Ocimum basilicum)

sweet coneflower (Rudbeckia subtomentosa)

sweet fennel (Foeniculum vulgare)

sweet marjoram (Origanum majorana)

sweet sagewort (Artemisia annua)

sweet vernalgrass (Anthoxanthum odoratum)

sweet William silene (Silene armeria)

sweetclover, yellow sweetclover, ribbed melilot, field melilot, cornilla real, white sweetclover (Melilotus officinalis)

sweetscented joe pye weed (Eutrochium purpureum)

sweetscented marigold (Tagetes lucida)

sweetsultan (Amberboa moschata)

sweetwilliam, sweet william (Dianthus barbatus)

switchgrass, old switch panic grass (Panicum virgatum)

Syrian beancaper (Zygophyllum fabago)

Syrian mesquite (Prosopis farcta)

T

tall blacktip ragwort (Senecio atratus)

tall fescue (Schedonorus arundinaceus)

tall morning-glory (Ipomoea purpurea)

tall oatgrass (Arrhenatherum elatius)

tall thimbleweed (Anemone virginiana)

tall tickseed (Coreopsis tripteris)

tall tumblemustard, tall hedge-mustard, tumblemustard, Jim Hill mustard, tall mustard, tumble mustard, tumbleweed mustard (Sisymbrium altissimum)

tall wheatgrass (Thinopyrum ponticum)

tall windmill grass (Chloris elata)

saltcedar, tamarix, tamarisk (Tamarix ramosissima)

Tangier pea (Lathyrus tingitanus)

tanseyleaf tansyaster (Machaeranthera tanacetifolia)

teff (Eragrostis tef)

Tejon poppy (Eschscholzia lemmonii subsp. kernensis)

tenweeks stock (Matthiola incana)

Texas almond, smallflower peachbrush (Prunus minutiflora)

Texas bindweed (Convolvulus equitans)

Texas blueweed (Helianthus ciliaris)

Texas lupine, Texas bluebonnet (Lupinus texensis)

Texas signalgrass (Urochloa texana)

Texas sleepydaisy, Texas sleepy-daisy (Xanthisma texanum)

Texas swampmallow, Wright's pavonia, rose pavonia, Texas rock rose (Pavonia lasiopetala)

thickspike wheatgrass (Elymus lanceolatus)

thin paspalum (Paspalum setaceum)

thistle sage (Salvia carduacea)

Thurber's fescue (Festuca thurberi)

thymeleaf sandwort, sandwort (Arenaria serpyllifolia)

Tifton burclover, rigid medick (Medicago rigidula)

tiger-pear, jointed prickly pear (Opuntia aurantiaca)

timber milkvetch (Astragalus miser)

timber oatgrass (Danthonia intermedia)

timothy, common timothy (Phleum pratense)

Tinkerbell (Nicotiana × hybrida)

tiny vetch, hairy vetch (Vicia hirsuta)

tomcat clover (Trifolium willdenovii)

tornillo (Prosopis reptans)

torpedo grass, couch panicum, creeping panic, panic rampant, wainaku grass (Panicum repens)

Torrey's rush (Juncus torreyi)

toyon (Heteromeles arbutifolia)

treasure-flower (Gazania rigens)

treedaisy, montanoa, tree daisy (Montanoa hibiscifolia)

tricolor daisy (Glebionis carinatum)

tropical kudzu (Pueraria phaseoloides)

tropical soda apple (Solanum viarum)

tropical white morning-glory (Ipomoea alba)

tufted hairgrass (Deschampsia cespitosa)

tufted poppy (Eschscholzia caespitosa)

turban ranunculus (Ranunculus asiaticus)

turkey berry, terongan, bhankatiya, devil's fig, fausse aubergine, kausoni, prickly solanum, turkeyberry (Solanum torvum)

turkey corn (Dicentra eximia)

tussock bellflower (Campanula carpatica)

twogrooved milkvetch (Astragalus bisulcatus)

two-leaf Cape tulip (Moraea miniata)

Tyrol knapweed, meadow knapweed (Centaurea nigrescens)

U

unicorn-plant (Proboscidea sp.)

upright blue beardtongue (Penstemon virgatus)

upright prairie coneflower, prairie coneflower, redspike Mexican hat (Ratibida columnifera)

Utah milkweed (Asclepias labriformis)

Utah sweetvetch, northern sweetvetch, boreal sweetvetch, boreal sweet-vetch (Hedysarum boreale subsp. boreale)

V

veiny dock (Rumex venosus)

velebit cover (Trifolium velebiticum)

velvet bean, cowitch, Florida velvet-bean, Bengal velvet-bean, cowage velvet-bean (Mucuna pruriens var. utilis)

velvet bentgrass, agróstide canina, agróstide de perro (Agrostis canina)

velvet crabgrass (Digitaria velutina)

velvet tree (Miconia calvescens)

velvetleaf (Abutilon theophrasti)

velvetweed (Oenothera curtiflora)

vervain (Verbena sp.)

Virginia pepperweed (Lepidium virginicum)

Virginia plantain, paleseed Indianwheat (Plantago virginica)

Virginia stock (Malcolmia maritima)

Virginia threeseed mercury (Acalypha virginica)

Virginia wildrye (Elymus virginicus)

W

water foxtail (Alopecurus geniculatus)

water knotweed (Persicaria amphibiium var. emersum)

water mannagrass (Glyceria fluitans)

water sedge (Carex aquatilis)

water speedwell, blue water speedwell (Veronica anagallis-aquatica)

watercress (Nasturtium officinale)

watermelon (Citrullus lanatus)

waterthyme (Hydrilla verticillata)

wavyleaf beeblossom (Oenothera sinuosa)

wavyleaf sea lavender (Limonium sinuatum)

wavyleaf thistle (Cirsium undulatum)

weakleaf bur ragweed (Ambrosia confertiflora)

weed silene, cone catchfly, weed campion (Silene conoidea)

weeping alkaligrass (Puccinellia distans)

weeping fingergrass (Eustachys distichophylla)

weeping lovegrass (Eragrostis curvula)

welsh onion (Allium fistulosum)

West Indian nightshade (Solanum ptychanthum)

West Indian raspberry, ola'a, roseleaf raspberry, thimbleberry (Rubus rosifolius)

western blue-eyed grass (Sisyrinchium bellum)

western goldentop, western goldenrod (Euthamia occidentalis)

western stoneseed, western gromwell, white stoneseed (Lithospermum ruderale)

western pearly everlasting (Anaphalis margaritacea)

western tansymustard (Descurainia pinnata)

western vervain (Verbena lasiostachys)

western water hemlock (Cicuta douglasii)

western wheatgrass (Pascopyrum smithii)

white bladderflower, bladder flower (Araujia sericifera)

white clover, Dutch clover, ladino clover, white Dutch clover (Trifolium repens)

white fir (Abies concolor)

white locoweed (Oxytropis sericea var. speciosa)

white lupine (Lupinus albus)

white moneywort (Alysicarpus vaginalis)

white mustard (Sinapis alba)

white prairie clover (Dalea candida)

white sage (Salvia apiana)

white vervain, white verbena (Verbena urticifolia)

whiteedge morning-glory (Ipomoea nil)

whitestem distaff thistle (Carthamus leucocaulos)

whitetop (Cardaria draba)

whitewhorl lupine (Lupinus densiflorus var. densiflorus)

wholeleaf Indian paintbrush (Castilleja integra)

whorled mountainmint (Pycnanthemum pilosum)

wild bergamot, wildbergamot horsemint, Oswego-tea, mintleaf beebalm, wildbergamot beebalm (Monarda fistulosa)

wild celery (Apium graveolens var. dulce)

wild chives (Allium schoenoprasum)

wild cucumber (Echinocystis lobata)

wild garlic (Allium vineale (bulb))

wild garlic (Allium vineale)

wild mint, field mint (Mentha arvensis)

wild oat (Avena fatua)

wild parsnip (Pastinaca sativa)

wild quinine, American feverfew (Parthenium integrifolium)

wild radish (Raphanus raphanistrum)

wild sugarcane, ahlek, loa, wild cane (Saccharum spontaneum)

wildrye (Elymus gmelinii)

willow dock (Rumex salicifolius)

winged everlasting (Ammobium alatum)

winged false buttonweed, broadleaf buttonweed (Spermacoce alata)

winged pigweed (Cycloloma atriplicifolium)

winged plumeless thistle (Carduus tenuiflorus)

wingleaf passionflower (Passiflora bicornis)

wingstem (Verbesina alternifolia)

winter squash, Hubbard squash, Queensland blue squash, banana squash, buttercup squash, Hokkaido squash, winter marrow, Atlantic giant pumpkin, mammoth pumpkin (Cucurbita maxima)

winter vetch, hairy vetch, woolly vetch (Vicia villosa)

winter vetch, hairy vetch (Vicia villosa subsp. varia)

witchgrass, panicgrass, ticklegrass, tumble panic, tumbleweed grass, witches hair, annual witchgrass, common panic grass, common witchgrass (Panicum capillare)

witchweed (Striga aspera)

Wittrock's violet (Viola ×wittrockiana)

wogon (Scutellaria baicalensis)

wood bluegrass, forest blue grass (Poa nemoralis)

woodland false buttonweed (Spermacoce assurgens)

woodland forget-me-not (Myosotis sylvatica)

woodland sage (Salvia ×sylvestris)

Woods' rose (Rosa woodsii)

woolgrass, bulrush (Scirpus cyperinus)

woolly distaff thistle (Carthamus lanatus)

woollyleaf bur ragweed (Ambrosia grayi)