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Family

Genus

Common name

Noxious Weed Seed

AOSA Examination List

Species Category

Disseminule/Planting Unit

Shape

Seed length

Seed width

Seed thickness

Color

Texture

Other structures

 

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Alectra fluminensis.  Small seeds are visible inside the fruit coat. Photo by Julia Scher, USDA-APHIS-PPQ. Alectra fluminensis. Small seeds are visible inside the fruit coat. Photo by Julia Scher, USDA-APHIS-PPQ.
Alectra fluminensis
Alectra fluminensis. Small seeds are visible inside the fruit coat. Photo by Julia Scher, USDA-APHIS-PPQ.
Alectra sessiliflora.  Texture is reticulate with ridges. Photo by Julia Scher, USDA-APHIS-PPQ. Alectra sessiliflora. Texture is reticulate with ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
Alectra sessiliflora
Alectra sessiliflora. Texture is reticulate with ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
Alectra sessiliflora.  Conical achenes. Photo by Julia Scher, USDA-APHIS-PPQ. Alectra sessiliflora. Conical achenes. Photo by Julia Scher, USDA-APHIS-PPQ.
Alectra sessiliflora
Alectra sessiliflora. Conical achenes. Photo by Julia Scher, USDA-APHIS-PPQ.
Alhagi maurorum.  True seeds top; Pod, bottom. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Alhagi maurorum. True seeds top; Pod, bottom. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Alhagi maurorum
Alhagi maurorum. True seeds top; Pod, bottom. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Allium canadense.  Wedge-shaped seeds with a wrinkled texture containing minute stipples. Allium canadense. Wedge-shaped seeds with a wrinkled texture containing minute stipples.
Allium canadense
Allium canadense. Wedge-shaped seeds with a wrinkled texture containing minute stipples.
Allium canadense (bulb). Bulblets are vegetative propagules and not a seed. Allium canadense (bulb). Bulblets are vegetative propagules and not a seed.
Allium canadense (bulb)
Allium canadense (bulb). Bulblets are vegetative propagules and not a seed.
Allium cepa. Wedge-shaped seeds with one flat surface. Allium cepa. Wedge-shaped seeds with one flat surface.
Allium cepa
Allium cepa. Wedge-shaped seeds with one flat surface.
Allium cepa . Photo by Norma Diaz, USDA APHIS PPQ. Allium cepa. Photo by Norma Diaz, USDA APHIS PPQ.
Allium cepa
Allium cepa. Photo by Norma Diaz, USDA APHIS PPQ.

Allium cepa . Scale marks are millimeters.  Photo by Norma Diaz, USDA APHIS PPQ. Allium cepa. Scale marks are millimeters.  Photo by Norma Diaz, USDA APHIS PPQ.
Allium cepa
Allium cepa. Scale marks are millimeters.  Photo by Norma Diaz, USDA APHIS PPQ.
Allium cepa . Scale marks are millimeters.  Photo by Norma Diaz, USDA APHIS PPQ. Allium cepa. Scale marks are millimeters.  Photo by Norma Diaz, USDA APHIS PPQ.
Allium cepa
Allium cepa. Scale marks are millimeters.  Photo by Norma Diaz, USDA APHIS PPQ.
Allium cepa . Showing surface texture. Photo by Norma Diaz, USDA APHIS PPQ. Allium cepa. Showing surface texture. Photo by Norma Diaz, USDA APHIS PPQ.
Allium cepa
Allium cepa. Showing surface texture. Photo by Norma Diaz, USDA APHIS PPQ.
Allium cepa . Photo by Kelly Ryan, USDA APHIS PPQ. Allium cepa. Photo by Kelly Ryan, USDA APHIS PPQ.
Allium cepa
Allium cepa. Photo by Kelly Ryan, USDA APHIS PPQ.

Allium cepa var. cepa . Photo by Madeline Maher, USDA-APHIS-PPQ. Allium cepa var. cepa. Photo by Madeline Maher, USDA-APHIS-PPQ.
Allium cepa
Allium cepa var. cepa. Photo by Madeline Maher, USDA-APHIS-PPQ.
Allium cernuum,  Wedge-shaped true seeds. Shiny, with large marginal and irregular ribs. Allium cernuum, Wedge-shaped true seeds. Shiny, with large marginal and irregular ribs.
Allium cernuum
Allium cernuum, Wedge-shaped true seeds. Shiny, with large marginal and irregular ribs.
Allium fistulosum . Wedge-shaped seed with one flat surface. Allium fistulosum. Wedge-shaped seed with one flat surface.
Allium fistulosum
Allium fistulosum. Wedge-shaped seed with one flat surface.
Allium fistulosum.  Wedge-shaped seed with one flat surface. Allium fistulosum. Wedge-shaped seed with one flat surface.
Allium fistulosum
Allium fistulosum. Wedge-shaped seed with one flat surface.

Allium neapolitanum.  Irregular ovate true seeds. Allium neapolitanum. Irregular ovate true seeds.
Allium neapolitanum
Allium neapolitanum. Irregular ovate true seeds.
Allium porrum. Large wrinkles and minute stipples. Allium porrum. Large wrinkles and minute stipples.
Allium porrum
Allium porrum. Large wrinkles and minute stipples.
Allium schoenoprasum.  The seed is thinner than that of other species of Allium . Cross-section is triangular. Allium schoenoprasum. The seed is thinner than that of other species of Allium. Cross-section is triangular.
Allium schoenoprasum
Allium schoenoprasum. The seed is thinner than that of other species of Allium. Cross-section is triangular.
Allium vineale.  Seeds are fairly long with two flat sides. Allium vineale. Seeds are fairly long with two flat sides.
Allium vineale
Allium vineale. Seeds are fairly long with two flat sides.

Allium vineale (bulb). Bulblets are somewhat narrower than those of A. canadense . Bulblets are vegetative, not true seeds. Allium vineale (bulb). Bulblets are somewhat narrower than those of A. canadense. Bulblets are vegetative, not true seeds.
Allium vineale (bulb)
Allium vineale (bulb). Bulblets are somewhat narrower than those of A. canadense. Bulblets are vegetative, not true seeds.
Alopecurus arundinaceus.  Caryopsis on the left. Pubescence on the keel of glumes. Alopecurus arundinaceus. Caryopsis on the left. Pubescence on the keel of glumes.
Alopecurus arundinaceus
Alopecurus arundinaceus. Caryopsis on the left. Pubescence on the keel of glumes.
Alopecurus geniculatus . Soft caryopsis upper middle. Geniculate awn emerging from the lemma. Alopecurus geniculatus. Soft caryopsis upper middle. Geniculate awn emerging from the lemma.
Alopecurus geniculatus
Alopecurus geniculatus. Soft caryopsis upper middle. Geniculate awn emerging from the lemma.
Alopecurus geniculatus . Pubescence. Alopecurus geniculatus. Pubescence.
Alopecurus geniculatus
Alopecurus geniculatus. Pubescence.

Alopecurus myosuroides.  Lanceolate spikelets with weak awns. Alopecurus myosuroides. Lanceolate spikelets with weak awns.
Alopecurus myosuroides
Alopecurus myosuroides. Lanceolate spikelets with weak awns.
Alopecurus myosuroides . Lateral view of inflorescence / infructescence.  Photo by Ana Margina, USDA-APHIS-PPQ. Alopecurus myosuroides. Lateral view of inflorescence / infructescence.  Photo by Ana Margina, USDA-APHIS-PPQ.
Alopecurus myosuroides
Alopecurus myosuroides. Lateral view of inflorescence / infructescence.  Photo by Ana Margina, USDA-APHIS-PPQ.
Alopecurus pratensis. Pointed glumes. Alopecurus pratensis. Pointed glumes.
Alopecurus pratensis
Alopecurus pratensis. Pointed glumes.
Alopecurus pratensi s. Geniculate awn. Alopecurus pratensis. Geniculate awn.
Alopecurus pratensis
Alopecurus pratensis. Geniculate awn.

Alternanthera philoxeroides.  Photo by Julia Scher, USDA-APHIS-PPQ. Alternanthera philoxeroides. Photo by Julia Scher, USDA-APHIS-PPQ.
Alternanthera philoxeroides
Alternanthera philoxeroides. Photo by Julia Scher, USDA-APHIS-PPQ.
Alternanthera pungens.  Sharp pointed bracts, perimeter of photo. True seed, center bottom. Alternanthera pungens. Sharp pointed bracts, perimeter of photo. True seed, center bottom.
Alternanthera pungens
Alternanthera pungens. Sharp pointed bracts, perimeter of photo. True seed, center bottom.
Alternanthera pungens. Face view of seed. Photo by Keith E. Clancy, USDA-APHIS-PPQ. Alternanthera pungens. Face view of seed. Photo by Keith E. Clancy, USDA-APHIS-PPQ.
Alternanthera pungens
Alternanthera pungens. Face view of seed. Photo by Keith E. Clancy, USDA-APHIS-PPQ.
Alternanthera sessilis.  Granular-coated fruits surrounded by six-pointed glumes. Photo by Julia Scher, USDA-APHIS-PPQ. Alternanthera sessilis. Granular-coated fruits surrounded by six-pointed glumes. Photo by Julia Scher, USDA-APHIS-PPQ.
Alternanthera sessilis
Alternanthera sessilis. Granular-coated fruits surrounded by six-pointed glumes. Photo by Julia Scher, USDA-APHIS-PPQ.

Alternanthera sessilis.  Discoid true seed. A linear embryo is visible surrounding a dark brown perisperm. Photo by Julia Scher, USDA-APHIS-PPQ. Alternanthera sessilis. Discoid true seed. A linear embryo is visible surrounding a dark brown perisperm. Photo by Julia Scher, USDA-APHIS-PPQ.
Alternanthera sessilis
Alternanthera sessilis. Discoid true seed. A linear embryo is visible surrounding a dark brown perisperm. Photo by Julia Scher, USDA-APHIS-PPQ.
Althaea officinalis.  Hilum of true seed with a pointed remnant of funiculus. Althaea officinalis. Hilum of true seed with a pointed remnant of funiculus.
Althaea officinalis
Althaea officinalis. Hilum of true seed with a pointed remnant of funiculus.
Alysicarpus vaginalis.  Oblong, speckled seeds. Alysicarpus vaginalis. Oblong, speckled seeds.
Alysicarpus vaginalis
Alysicarpus vaginalis. Oblong, speckled seeds.
Alysicarpus vaginalis . Edge view (top) with hilar region visible; face view (bottom). Photo by Ana Margina, USDA-APHIS-PPQ. Alysicarpus vaginalis. Edge view (top) with hilar region visible; face view (bottom). Photo by Ana Margina, USDA-APHIS-PPQ.
Alysicarpus vaginalis
Alysicarpus vaginalis. Edge view (top) with hilar region visible; face view (bottom). Photo by Ana Margina, USDA-APHIS-PPQ.

Amaranthus albus.  Hilum on the disc margin. A linear embryo is detectable within the entire margin. Amaranthus albus. Hilum on the disc margin. A linear embryo is detectable within the entire margin.
Amaranthus albus
Amaranthus albus. Hilum on the disc margin. A linear embryo is detectable within the entire margin.
Amaranthus albus . Close-up of the seed's surface. Hilum is to the right. Photo courtesy of USDA-APHIS-PPQ. Amaranthus albus. Close-up of the seed's surface. Hilum is to the right. Photo courtesy of USDA-APHIS-PPQ.
Amaranthus albus
Amaranthus albus. Close-up of the seed's surface. Hilum is to the right. Photo courtesy of USDA-APHIS-PPQ.
Amaranthus cruentes.  Ovate, lenticular true seeds. Amaranthus cruentes. Ovate, lenticular true seeds.
Amaranthus cruentus
Amaranthus cruentes. Ovate, lenticular true seeds.
Amaranthus hypochondriacus.  White seeds. Amaranthus hypochondriacus. White seeds.
Amaranthus hypochondriacus
Amaranthus hypochondriacus. White seeds.