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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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Ipomoea tricolor. Seeds with a light brown hilum on the basal end. Ipomoea tricolor. Seeds with a light brown hilum on the basal end.
Ipomoea tricolor
Ipomoea tricolor. Seeds with a light brown hilum on the basal end.
Ipomoea tricolor. Seeds with a dorsal view that shows two flat sides separated by the rib. Ipomoea tricolor. Seeds with a dorsal view that shows two flat sides separated by the rib.
Ipomoea tricolor
Ipomoea tricolor. Seeds with a dorsal view that shows two flat sides separated by the rib.
Ipomoea turbinata. Seeds with a large, round hilum that's not parallel to the axis.  Ipomoea turbinata. Seeds with a large, round hilum that's not parallel to the axis. 
Ipomoea turbinata
Ipomoea turbinata. Seeds with a large, round hilum that's not parallel to the axis. 
Ipomopsis rubra. Seeds with a hilum that's usually associated with a ridge between two flat surfaces.  Ipomopsis rubra. Seeds with a hilum that's usually associated with a ridge between two flat surfaces. 
Ipomopsis rubra
Ipomopsis rubra. Seeds with a hilum that's usually associated with a ridge between two flat surfaces. 

Iris missouriensis. Reticulated seeds, some with a wedged D-shape. Iris missouriensis. Reticulated seeds, some with a wedged D-shape.
Iris missouriensis
Iris missouriensis. Reticulated seeds, some with a wedged D-shape.
Iris missouriensis. Reticulated seeds, some with a wedged D-shape, and the hilum at the pointed basal end. Iris missouriensis. Reticulated seeds, some with a wedged D-shape, and the hilum at the pointed basal end.
Iris missouriensis
Iris missouriensis. Reticulated seeds, some with a wedged D-shape, and the hilum at the pointed basal end.
Isatis tinctoria. Lavender siliques with a longitudinal line in the center and remnants of the pedicel.  Isatis tinctoria. Lavender siliques with a longitudinal line in the center and remnants of the pedicel. 
Isatis tinctoria
Isatis tinctoria. Lavender siliques with a longitudinal line in the center and remnants of the pedicel. 
Isatis tinctoria. Lavender siliques with a longitudinal line in the center.  Isatis tinctoria. Lavender siliques with a longitudinal line in the center. 
Isatis tinctoria
Isatis tinctoria. Lavender siliques with a longitudinal line in the center. 

Ischaemum rugosum.  Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ. Ischaemum rugosum. Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum
Ischaemum rugosum. Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum. Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ. Ischaemum rugosum. Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum
Ischaemum rugosum. Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum.  Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ. Ischaemum rugosum. Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum
Ischaemum rugosum. Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum.  Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ. Ischaemum rugosum. Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum
Ischaemum rugosum. Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ.

Isocoma tenuisecta. Pubescent achenes that narrow at the basal half. Photo by Julia Scher, USDA-APHIS-PPQ. Isocoma tenuisecta. Pubescent achenes that narrow at the basal half. Photo by Julia Scher, USDA-APHIS-PPQ.
Isocoma tenuisecta
Isocoma tenuisecta. Pubescent achenes that narrow at the basal half. Photo by Julia Scher, USDA-APHIS-PPQ.
Isocoma veneta. Pubescent achenes with a long, silky, and abundant pappus. Photo by Julia Scher, USDA-APHIS-PPQ. Isocoma veneta. Pubescent achenes with a long, silky, and abundant pappus. Photo by Julia Scher, USDA-APHIS-PPQ.
Isocoma veneta
Isocoma veneta. Pubescent achenes with a long, silky, and abundant pappus. Photo by Julia Scher, USDA-APHIS-PPQ.
Iva annua. Achenes with two spaced-out longitudinal ribs on a flat surface.  Iva annua. Achenes with two spaced-out longitudinal ribs on a flat surface. 
Iva annua
Iva annua. Achenes with two spaced-out longitudinal ribs on a flat surface. 
Iva axillaris. Achenes are yellow to gray- black with a dull and rough surface texture.  Iva axillaris. Achenes are yellow to gray- black with a dull and rough surface texture. 
Iva axillaris
Iva axillaris. Achenes are yellow to gray- black with a dull and rough surface texture. 

Iva axillaris. Looking down on the bases of two fruits. The fruit attachment scar is thin and often crescent-shaped. Photo courtesy of USDA-APHIS-PPQ. Iva axillaris. Looking down on the bases of two fruits. The fruit attachment scar is thin and often crescent-shaped. Photo courtesy of USDA-APHIS-PPQ.
Iva axillaris
Iva axillaris. Looking down on the bases of two fruits. The fruit attachment scar is thin and often crescent-shaped. Photo courtesy of USDA-APHIS-PPQ.
Jacquemontia tamnifolia. Dull obovate seeds with tuberculate protuberances.  Jacquemontia tamnifolia. Dull obovate seeds with tuberculate protuberances. 
Jacquemontia tamnifolia
Jacquemontia tamnifolia. Dull obovate seeds with tuberculate protuberances. 
From Left to Right: 1. Ipomea hederacea 2. Ipomea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia . Seeds with a hilum with the axis not parallel to the seed axis. From Left to Right: 1. Ipomea hederacea 2. Ipomea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds with a hilum with the axis not parallel to the seed axis.
Jacquemontia tamnifolia
From Left to Right: 1. Ipomea hederacea 2. Ipomea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds with a hilum with the axis not parallel to the seed axis.
Juncus tenuis. Seeds are often in clusters with flaky material attached. Juncus tenuis. Seeds are often in clusters with flaky material attached.
Juncus tenuis
Juncus tenuis. Seeds are often in clusters with flaky material attached.

Juncus torreyi. Rectangularly reticulated seeds with a dark lobe on the radicle end. Juncus torreyi. Rectangularly reticulated seeds with a dark lobe on the radicle end.
Juncus torreyi
Juncus torreyi. Rectangularly reticulated seeds with a dark lobe on the radicle end.
Knautia arvensis. Achenes with a long neck and spikes at the apex. Achenes are enclosed in united petal bases. Knautia arvensis. Achenes with a long neck and spikes at the apex. Achenes are enclosed in united petal bases.
Knautia arvensis
Knautia arvensis. Achenes with a long neck and spikes at the apex. Achenes are enclosed in united petal bases.
Kniphofia uvaria. Seeds with many irregular flat surfaces.  Kniphofia uvaria. Seeds with many irregular flat surfaces. 
Kniphofia uvaria
Kniphofia uvaria. Seeds with many irregular flat surfaces. 
Koeleria macrantha. Florets with a palea that is transparent and elevated out from the lemma. Koeleria macrantha. Florets with a palea that is transparent and elevated out from the lemma.
Koeleria macrantha
Koeleria macrantha. Florets with a palea that is transparent and elevated out from the lemma.

Koeleria macrantha. Florets with a small lateral groove above the callus. Koeleria macrantha. Florets with a small lateral groove above the callus.
Koeleria macrantha
Koeleria macrantha. Florets with a small lateral groove above the callus.
Kummerowia stipulacea .The pod and calyx are important identification characters. Here the calyx is one-half the length of the pod and its lobes not slit to the base. The pod has strong venation and short appressed hairs. The hilum appears as a nipple on some seeds. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Kummerowia stipulacea.The pod and calyx are important identification characters. Here the calyx is one-half the length of the pod and its lobes not slit to the base. The pod has strong venation and short appressed hairs. The hilum appears as a nipple on some seeds. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Kummerowia stipulacea
Kummerowia stipulacea.The pod and calyx are important identification characters. Here the calyx is one-half the length of the pod and its lobes not slit to the base. The pod has strong venation and short appressed hairs. The hilum appears as a nipple on some seeds. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Kummerowia striata. Purple seeds with light colored flecks that are found in pods with appressed hairs.  Kummerowia striata. Purple seeds with light colored flecks that are found in pods with appressed hairs. 
Kummerowia striata
Kummerowia striata. Purple seeds with light colored flecks that are found in pods with appressed hairs. 
Lablab purpureus. The seed hilum is covered with white spongy tissue. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences, 2005. Lablab purpureus. The seed hilum is covered with white spongy tissue. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences, 2005.
Lablab purpureus
Lablab purpureus. The seed hilum is covered with white spongy tissue. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences, 2005.

Lablab purpureus . The seed hilum is covered with white spongy tissue. Photo courtesy of USDA-APHIS-PPQ. Lablab purpureus. The seed hilum is covered with white spongy tissue. Photo courtesy of USDA-APHIS-PPQ.
Lablab purpureus
Lablab purpureus. The seed hilum is covered with white spongy tissue. Photo courtesy of USDA-APHIS-PPQ.
Lactuca sativa. Black to white achenes with several ribs that are longitudinal, and finely serrated.  Lactuca sativa. Black to white achenes with several ribs that are longitudinal, and finely serrated. 
Lactuca sativa
Lactuca sativa. Black to white achenes with several ribs that are longitudinal, and finely serrated. 
Lactuca sativa. Black to white achenes with several ribs that are longitudinal and finely serrated. Photo by Ana Margina, USDA-APHIS-PPQ. Lactuca sativa. Black to white achenes with several ribs that are longitudinal and finely serrated. Photo by Ana Margina, USDA-APHIS-PPQ.
Lactuca sativa
Lactuca sativa. Black to white achenes with several ribs that are longitudinal and finely serrated. Photo by Ana Margina, USDA-APHIS-PPQ.
Lactuca tatarica  var. pulchella. Brown achenes with a white apex. Lactuca tatarica var. pulchella. Brown achenes with a white apex.
Lactuca tatarica var. pulchella
Lactuca tatarica var. pulchella. Brown achenes with a white apex.

Largarosiphon major . Photo by Julia Scher, USDA-APHIS-PPQ. Largarosiphon major. Photo by Julia Scher, USDA-APHIS-PPQ.
Lagarosiphon major
Largarosiphon major. Photo by Julia Scher, USDA-APHIS-PPQ.
Largarosiphon major . Photo by Julia Scher, USDA-APHIS-PPQ. Largarosiphon major. Photo by Julia Scher, USDA-APHIS-PPQ.
Lagarosiphon major
Largarosiphon major. Photo by Julia Scher, USDA-APHIS-PPQ.
Lagenaria siceraria. Seeds with broad lobes at the apical end, longitudinal ridges, and grooves.  Lagenaria siceraria. Seeds with broad lobes at the apical end, longitudinal ridges, and grooves. 
Lagenaria siceraria
Lagenaria siceraria. Seeds with broad lobes at the apical end, longitudinal ridges, and grooves. 
Lamium amplexicaule. Black nutlets with brown mottling. Lamium amplexicaule. Black nutlets with brown mottling.
Lamium amplexicaule
Lamium amplexicaule. Black nutlets with brown mottling.

Lamium amplexicaule . Ventral view of two nutlets. Elaiosome at bottom. Photo courtesy of USDA-APHIS-PPQ. Lamium amplexicaule. Ventral view of two nutlets. Elaiosome at bottom. Photo courtesy of USDA-APHIS-PPQ.
Lamium amplexicaule
Lamium amplexicaule. Ventral view of two nutlets. Elaiosome at bottom. Photo courtesy of USDA-APHIS-PPQ.
Lappula occidentalis var. occidentalis. Nutlets with a loop of spines that follow the dorsal margin.  Lappula occidentalis var. occidentalis. Nutlets with a loop of spines that follow the dorsal margin. 
Lappula occidentalis var. occidentalis
Lappula occidentalis var. occidentalis. Nutlets with a loop of spines that follow the dorsal margin. 
Lappula squarrosa. Nutlets with a row of spines with recurved hooks on their ends that are arranged along the margin of the ventral side.  Lappula squarrosa. Nutlets with a row of spines with recurved hooks on their ends that are arranged along the margin of the ventral side. 
Lappula squarrosa
Lappula squarrosa. Nutlets with a row of spines with recurved hooks on their ends that are arranged along the margin of the ventral side. 
Lapsana communis. Achenes with large longitudinal ribs with small ribs in between.  Lapsana communis. Achenes with large longitudinal ribs with small ribs in between. 
Lapsana communis
Lapsana communis. Achenes with large longitudinal ribs with small ribs in between.