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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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Aquilegia canadensis.  Hilum on a somewhat pointed base. Aquilegia canadensis. Hilum on a somewhat pointed base.
Aquilegia canadensis
Aquilegia canadensis. Hilum on a somewhat pointed base.
Aquilegia canadensis. Seeds with distinct ribs. Aquilegia canadensis. Seeds with distinct ribs.
Aquilegia canadensis
Aquilegia canadensis. Seeds with distinct ribs.
Aquilegia coerulea . Surface with irregular indentations. Aquilegia coerulea. Surface with irregular indentations.
Aquilegia coerulea
Aquilegia coerulea. Surface with irregular indentations.
Aquilegia vulgaris.  Irregularly obovate to moderate D-shaped. true seeds. Aquilegia vulgaris. Irregularly obovate to moderate D-shaped. true seeds.
Aquilegia vulgaris
Aquilegia vulgaris. Irregularly obovate to moderate D-shaped. true seeds.

Aquilegia vulgaris.  Many seeds are wedge-shaped with a possible wing on the narrow margin. Aquilegia vulgaris. Many seeds are wedge-shaped with a possible wing on the narrow margin.
Aquilegia vulgaris
Aquilegia vulgaris. Many seeds are wedge-shaped with a possible wing on the narrow margin.
Arabis alpina . Winged on the margin. Wing will extend to the entire margin or just the basal margin opposite the hilum. Arabis alpina. Winged on the margin. Wing will extend to the entire margin or just the basal margin opposite the hilum.
Arabis alpina
Arabis alpina. Winged on the margin. Wing will extend to the entire margin or just the basal margin opposite the hilum.
Arachis hypogaea.  True seeds with fragile seed coats, borne in pods. Arachis hypogaea. True seeds with fragile seed coats, borne in pods.
Arachis hypogaea
Arachis hypogaea. True seeds with fragile seed coats, borne in pods.
Araujia sericifera.  The ventral side is very rough with some longitudinal ridges. Dorsal side is smoother with a central longitudinal groove. Araujia sericifera. The ventral side is very rough with some longitudinal ridges. Dorsal side is smoother with a central longitudinal groove.
Araujia sericifera
Araujia sericifera. The ventral side is very rough with some longitudinal ridges. Dorsal side is smoother with a central longitudinal groove.

Artium lappa . Achene is curved with angular longitudinal surfaces; light brown with light black irregular slashes. Artium lappa. Achene is curved with angular longitudinal surfaces; light brown with light black irregular slashes.
Arctium lappa
Artium lappa. Achene is curved with angular longitudinal surfaces; light brown with light black irregular slashes.
Arctium minus. Light brown achenes with dark mottling. Arctium minus. Light brown achenes with dark mottling.
Arctium minus
Arctium minus. Light brown achenes with dark mottling.
Arctotheca calendula.  Obovate seed, sometimes woolly pubescent. Arctotheca calendula. Obovate seed, sometimes woolly pubescent.
Arctotheca calendula
Arctotheca calendula. Obovate seed, sometimes woolly pubescent.
Arctotheca calendula.  Achenes with short and transverse ribs. Arctotheca calendula. Achenes with short and transverse ribs.
Arctotheca calendula
Arctotheca calendula. Achenes with short and transverse ribs.

Arctotheca calendula. Fruit with hairs teased back to better reveal the fruit. Photo courtesy of USDA-APHIS-PPQ. Arctotheca calendula. Fruit with hairs teased back to better reveal the fruit. Photo courtesy of USDA-APHIS-PPQ.
Arctotheca calendula
Arctotheca calendula. Fruit with hairs teased back to better reveal the fruit. Photo courtesy of USDA-APHIS-PPQ.
Arctotis fastuosa . The dosal side is moderately rough. The ventral side is very rough. Arctotis fastuosa. The dosal side is moderately rough. The ventral side is very rough.
Arctotis fastuosa
Arctotis fastuosa. The dosal side is moderately rough. The ventral side is very rough.
Arctotis venusta.  Pappus is broad, feather-shaped shaped and somewhat transparent. Arctotis venusta. Pappus is broad, feather-shaped shaped and somewhat transparent.
Arctotis stoechadifolia 
Arctotis venusta. Pappus is broad, feather-shaped shaped and somewhat transparent.
Arenaria serpyllifolia.  Tubercles are regular and arranged in rows. Arenaria serpyllifolia. Tubercles are regular and arranged in rows.
Arenaria serpyllifolia
Arenaria serpyllifolia. Tubercles are regular and arranged in rows.

Argemone albiflora . Globose true seeds with reticulations. Argemone albiflora. Globose true seeds with reticulations.
Argemone albiflora
Argemone albiflora. Globose true seeds with reticulations.
Argemone albiflora. Lateral view of seed. Photo by Lindsey Seastone, USDA-APHIS-PPQ. Argemone albiflora. Lateral view of seed. Photo by Lindsey Seastone, USDA-APHIS-PPQ.
Argemone albiflora
Argemone albiflora. Lateral view of seed. Photo by Lindsey Seastone, USDA-APHIS-PPQ.
Argemone hispida.  Globose true seeds with strong reticulations and shiny concavities. Argemone hispida. Globose true seeds with strong reticulations and shiny concavities.
Argemone hispida
Argemone hispida. Globose true seeds with strong reticulations and shiny concavities.
Argemone polyandhemos . Globose true seeds with deep square reticulations. Argemone polyandhemos. Globose true seeds with deep square reticulations.
Argemone polyanthemos
Argemone polyandhemos. Globose true seeds with deep square reticulations.

Aristida adscensionis.  Lemma with three long awns. Sharp, pointed, and pubescent callus. Aristida adscensionis. Lemma with three long awns. Sharp, pointed, and pubescent callus.
Aristida adscensionis
Aristida adscensionis. Lemma with three long awns. Sharp, pointed, and pubescent callus.
Aristida dichotoma.  Linear florets. Spiklets contain one floret with well-developed awns and a pointed callus. covered with hair. Aristida dichotoma. Linear florets. Spiklets contain one floret with well-developed awns and a pointed callus. covered with hair.
Aristida dichotoma
Aristida dichotoma. Linear florets. Spiklets contain one floret with well-developed awns and a pointed callus. covered with hair.
Armeria sp. Conical achenes with longitudinal ribbed hairs. Armeria sp. Conical achenes with longitudinal ribbed hairs.
Armeria sp.
Armeria sp. Conical achenes with longitudinal ribbed hairs.
Arnica chamissonis ssp. foliosa var. andina . Achenes with a white apical crown.  Arnica chamissonis ssp. foliosa var. andina. Achenes with a white apical crown. 
Arnica chamissonis
Arnica chamissonis ssp. foliosa var. andina. Achenes with a white apical crown. 

Arrhenatherum elatius.  Achene with a long geniculate awn and strong bristles surrounding the callus.  Arrhenatherum elatius. Achene with a long geniculate awn and strong bristles surrounding the callus. 
Arrhenatherum elatius
Arrhenatherum elatius. Achene with a long geniculate awn and strong bristles surrounding the callus. 
Arrhenatherum elatius . Floret pair. Photo courtesy of USDA-APHIS-PPQ. Arrhenatherum elatius. Floret pair. Photo courtesy of USDA-APHIS-PPQ.
Arrhenatherum elatius
Arrhenatherum elatius. Floret pair. Photo courtesy of USDA-APHIS-PPQ.
Artemisia absinthium.  Achenes with visible longitudinal lines. Artemisia absinthium. Achenes with visible longitudinal lines.
Artemisia absinthium
Artemisia absinthium. Achenes with visible longitudinal lines.
Artemisia annua.  Obovate achenes, with many fine longitudinal ribs and granular texture. Artemisia annua. Obovate achenes, with many fine longitudinal ribs and granular texture.
Artemisia annua
Artemisia annua. Obovate achenes, with many fine longitudinal ribs and granular texture.

Artemisia arbuscula ssp. arbuscula.  Longitudinal ribs give the surface an angular structure with flat areas between the ribs. Artemisia arbuscula ssp. arbuscula. Longitudinal ribs give the surface an angular structure with flat areas between the ribs.
Artemisia arbuscula subsp. arbuscula
Artemisia arbuscula ssp. arbuscula. Longitudinal ribs give the surface an angular structure with flat areas between the ribs.
Artemisia vulgaris.  Achenes with a small hilum extending beyond the base. Artemisia vulgaris. Achenes with a small hilum extending beyond the base.
Artemisia douglasiana
Artemisia vulgaris. Achenes with a small hilum extending beyond the base.
Artemisia frigida.  Texture is weak with small netting. Artemisia frigida. Texture is weak with small netting.
Artemisia frigida
Artemisia frigida. Texture is weak with small netting.
Artemisia frigida.  Spatulate achene with few or no longitudinal markings. Artemisia frigida. Spatulate achene with few or no longitudinal markings.
Artemisia frigida
Artemisia frigida. Spatulate achene with few or no longitudinal markings.

Asclepias curassavica.  True seed with a winged margin and a truncated base. Asclepias curassavica. True seed with a winged margin and a truncated base.
Asclepias curassavica
Asclepias curassavica. True seed with a winged margin and a truncated base.
Asclepias incarnata.  Dimples on wings are papery and faint. Asclepias incarnata. Dimples on wings are papery and faint.
Asclepias incarnata
Asclepias incarnata. Dimples on wings are papery and faint.
Asclepias labriformis.  True seed, texture rough. Asclepias labriformis. True seed, texture rough.
Asclepias labriformis
Asclepias labriformis. True seed, texture rough.
Asclepias speciosa.  True seed with winged margins and small warts on the dorsal side. Asclepias speciosa. True seed with winged margins and small warts on the dorsal side.
Asclepias speciosa
Asclepias speciosa. True seed with winged margins and small warts on the dorsal side.

Asclepias speciosa.  True seed with winged margins and small warts on the dorsal side. Asclepias speciosa. True seed with winged margins and small warts on the dorsal side.
Asclepias speciosa
Asclepias speciosa. True seed with winged margins and small warts on the dorsal side.
Asclepias subverticillata. Seeds with long, silky basal hairs, which are usually missing in conditioned seed lots.  Asclepias subverticillata. Seeds with long, silky basal hairs, which are usually missing in conditioned seed lots. 
Asclepias subverticillata
Asclepias subverticillata. Seeds with long, silky basal hairs, which are usually missing in conditioned seed lots. 
Asclepias syriaca.  Flat, winged, obovate, narrowing at the base. The base is sometimes associated with a tuft of plumose hairs that break off easily. Asclepias syriaca. Flat, winged, obovate, narrowing at the base. The base is sometimes associated with a tuft of plumose hairs that break off easily.
Asclepias syriaca
Asclepias syriaca. Flat, winged, obovate, narrowing at the base. The base is sometimes associated with a tuft of plumose hairs that break off easily.
Asclepias tuberosa.  Spatulate true seeds with winged margins. Asclepias tuberosa. Spatulate true seeds with winged margins.
Asclepias tuberosa
Asclepias tuberosa. Spatulate true seeds with winged margins.