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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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Larrea tridentata. The dorsal side of the fruit is densely covered with long hairs. Larrea tridentata. The dorsal side of the fruit is densely covered with long hairs.
Larrea tridentata
Larrea tridentata. The dorsal side of the fruit is densely covered with long hairs.
Larrea tridentata. The fruit splits into five indehiscent, one-seeded nutlets.  Larrea tridentata. The fruit splits into five indehiscent, one-seeded nutlets. 
Larrea tridentata
Larrea tridentata. The fruit splits into five indehiscent, one-seeded nutlets. 
Lasthenia californica. Achenes with a pappus of triangular and papery scales.  Lasthenia californica. Achenes with a pappus of triangular and papery scales. 
Lasthenia californica
Lasthenia californica. Achenes with a pappus of triangular and papery scales. 
Lasthenia glabrata. Achenes with an enlarged yellow attachment. Lasthenia glabrata. Achenes with an enlarged yellow attachment.
Lasthenia glabrata
Lasthenia glabrata. Achenes with an enlarged yellow attachment.

Lathyrus aphaca. Yellow, orange, and red seeds with broad black flecking or mottling, and whitened hilum margins. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Lathyrus aphaca. Yellow, orange, and red seeds with broad black flecking or mottling, and whitened hilum margins. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lathyrus aphaca
Lathyrus aphaca. Yellow, orange, and red seeds with broad black flecking or mottling, and whitened hilum margins. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lathyrus hirsutus . Hilum area and rough textured globose true seed. Photo by Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory. Germany, Erfurt. Lathyrus hirsutus. Hilum area and rough textured globose true seed. Photo by Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory. Germany, Erfurt.
Lathyrus hirsutus
Lathyrus hirsutus. Hilum area and rough textured globose true seed. Photo by Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory. Germany, Erfurt.
Lathyrus latifolius. The hilum is almost the full length of the light and dark brown mottled seeds. Lathyrus latifolius. The hilum is almost the full length of the light and dark brown mottled seeds.
Lathyrus latifolius
Lathyrus latifolius. The hilum is almost the full length of the light and dark brown mottled seeds.
Lathyrus sylvestris. Seeds with a long, linear hilum. Lathyrus sylvestris. Seeds with a long, linear hilum.
Lathyrus sylvestris
Lathyrus sylvestris. Seeds with a long, linear hilum.

Lathyrus sylvestris. Seeds with a long, linear hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Lathyrus sylvestris. Seeds with a long, linear hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lathyrus sylvestris
Lathyrus sylvestris. Seeds with a long, linear hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lathyrus tingitanus . Seeds with a bulky hilum that protrudes from the seed margin, and is half the seed length. Lathyrus tingitanus. Seeds with a bulky hilum that protrudes from the seed margin, and is half the seed length.
Lathyrus tingitanus
Lathyrus tingitanus. Seeds with a bulky hilum that protrudes from the seed margin, and is half the seed length.
Lavandula angustifolia. Nutlets with a white seed attachment area. Lavandula angustifolia. Nutlets with a white seed attachment area.
Lavandula angustifolia
Lavandula angustifolia. Nutlets with a white seed attachment area.
Lavatera trimestris. Mericarps with many transverse ribs, true seeds are rough.  Lavatera trimestris. Mericarps with many transverse ribs, true seeds are rough. 
Lavatera trimestris
Lavatera trimestris. Mericarps with many transverse ribs, true seeds are rough. 

Lavatera trimestris.  Mericarps, with true seeds partially exposed. Photo courtesy of USDA-APHIS-PPQ. Lavatera trimestris. Mericarps, with true seeds partially exposed. Photo courtesy of USDA-APHIS-PPQ.
Lavatera trimestris
Lavatera trimestris. Mericarps, with true seeds partially exposed. Photo courtesy of USDA-APHIS-PPQ.
Layia platyglossa. Three distinct achene types. Layia platyglossa. Three distinct achene types.
Layia platyglossa
Layia platyglossa. Three distinct achene types.
Lens culinaris. Lenticular seeds with sharp margins. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Lens culinaris. Lenticular seeds with sharp margins. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lens culinaris
Lens culinaris. Lenticular seeds with sharp margins. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Leonotis nepetifolia. Black and white mottled achenes with a ventral side with two flat surfaces separated by a rib. Leonotis nepetifolia. Black and white mottled achenes with a ventral side with two flat surfaces separated by a rib.
Leonotis nepetifolia
Leonotis nepetifolia. Black and white mottled achenes with a ventral side with two flat surfaces separated by a rib.

Leontopodium nivale . Achenes that are finely reticulate and sparsely covered with very short hairs. Leontopodium nivale. Achenes that are finely reticulate and sparsely covered with very short hairs.
Leontopodium nivale
Leontopodium nivale. Achenes that are finely reticulate and sparsely covered with very short hairs.
Leonurus cardiaca. Achenes with a flat apical end that is covered in short hairs. Leonurus cardiaca. Achenes with a flat apical end that is covered in short hairs.
Leonurus cardiaca
Leonurus cardiaca. Achenes with a flat apical end that is covered in short hairs.
Lepidium campestre. Seeds and silicles. Lepidium campestre. Seeds and silicles.
Lepidium campestre
Lepidium campestre. Seeds and silicles.
Lepidium campestre. Seeds with a rough and tuberculate surface. Lepidium campestre. Seeds with a rough and tuberculate surface.
Lepidium campestre
Lepidium campestre. Seeds with a rough and tuberculate surface.

From Left to Right: 1. Lepidium densiflorum 2. Lepidium sativum 3. Lepidium virginicum . Seeds with a groove between the lobes. From Left to Right: 1. Lepidium densiflorum 2. Lepidium sativum 3. Lepidium virginicum. Seeds with a groove between the lobes.
Lepidium densiflorum
From Left to Right: 1. Lepidium densiflorum 2. Lepidium sativum 3. Lepidium virginicum. Seeds with a groove between the lobes.
Lepidium densiflorum. Seeds with a brown, shiny, and rough surface. Lepidium densiflorum. Seeds with a brown, shiny, and rough surface.
Lepidium densiflorum
Lepidium densiflorum. Seeds with a brown, shiny, and rough surface.
Lepidium latifolium. Seeds with a deep groove dividing the radicle and cotyledon lobes.  Lepidium latifolium. Seeds with a deep groove dividing the radicle and cotyledon lobes. 
Lepidium latifolium
Lepidium latifolium. Seeds with a deep groove dividing the radicle and cotyledon lobes. 
Lepidium sativum. Seeds with a curved radicle margin. Lepidium sativum. Seeds with a curved radicle margin.
Lepidium sativum
Lepidium sativum. Seeds with a curved radicle margin.

From Left to Right: 1. Lepidium densiflorum 2. Lepidium sativum 3. Lepidium virginicum . Seeds with a groove at the base, between the lobes. From Left to Right: 1. Lepidium densiflorum 2. Lepidium sativum 3. Lepidium virginicum. Seeds with a groove at the base, between the lobes.
Lepidium sativum
From Left to Right: 1. Lepidium densiflorum 2. Lepidium sativum 3. Lepidium virginicum. Seeds with a groove at the base, between the lobes.
Lepidium virginicum.  Seeds that are light brown with a yellow wing and hilum area. Lepidium virginicum. Seeds that are light brown with a yellow wing and hilum area.
Lepidium virginicum
Lepidium virginicum. Seeds that are light brown with a yellow wing and hilum area.
From Left to Right: 1. Lepidium densiflorum 2. Lepidium sativum 3. Lepidium virginicum . Seeds with strong wings on the radicle lobe margin. From Left to Right: 1. Lepidium densiflorum 2. Lepidium sativum 3. Lepidium virginicum. Seeds with strong wings on the radicle lobe margin.
Lepidium virginicum
From Left to Right: 1. Lepidium densiflorum 2. Lepidium sativum 3. Lepidium virginicum. Seeds with strong wings on the radicle lobe margin.
Leptochloa chinensis . Pubescent florets. Photo by Julia Scher, USDA-APHIS-PPQ. Leptochloa chinensis. Pubescent florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa chinensis
Leptochloa chinensis. Pubescent florets. Photo by Julia Scher, USDA-APHIS-PPQ.

Leptochloa chinensis. Dark brown caryopses with striations. Photo by Julia Scher, USDA-APHIS-PPQ. Leptochloa chinensis. Dark brown caryopses with striations. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa chinensis
Leptochloa chinensis. Dark brown caryopses with striations. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa chinensis. Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ. Leptochloa chinensis. Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa chinensis
Leptochloa chinensis. Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ.
Lepthochloa chinensis. Pubescent florets and a brown caryopsis. Photo by Julia Scher, USDA-APHIS-PPQ. Lepthochloa chinensis. Pubescent florets and a brown caryopsis. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa chinensis
Lepthochloa chinensis. Pubescent florets and a brown caryopsis. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa dubia. Florets with oval caryopses and a slender rachilla with a wide disc at the apex. Leptochloa dubia. Florets with oval caryopses and a slender rachilla with a wide disc at the apex.
Leptochloa dubia
Leptochloa dubia. Florets with oval caryopses and a slender rachilla with a wide disc at the apex.

Leptochloa filiformis. Caryopsis is dark brown, obovate, and the surface is striate. Photo by Julia Scher, USDA-APHIS-PPQ. Leptochloa filiformis. Caryopsis is dark brown, obovate, and the surface is striate. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa panicea subsp. brachiata
Leptochloa filiformis. Caryopsis is dark brown, obovate, and the surface is striate. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa filiformis. Caryopsis is dark brown, obovate, and the surface is striate. Photo by Julia Scher, USDA-APHIS-PPQ. Leptochloa filiformis. Caryopsis is dark brown, obovate, and the surface is striate. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa panicea subsp. brachiata
Leptochloa filiformis. Caryopsis is dark brown, obovate, and the surface is striate. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa filiformis.  Florets with a slightly flared rachilla apex. Photo by Julia Scher, USDA-APHIS-PPQ. Leptochloa filiformis. Florets with a slightly flared rachilla apex. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa panicea subsp. brachiata
Leptochloa filiformis. Florets with a slightly flared rachilla apex. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa filiformis.  White pubescent florets. Photo by Julia Scher, USDA-APHIS-PPQ. Leptochloa filiformis. White pubescent florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Leptochloa panicea subsp. brachiata
Leptochloa filiformis. White pubescent florets. Photo by Julia Scher, USDA-APHIS-PPQ.

Lespedeza capitata. Seeds have large color variations.  Lespedeza capitata. Seeds have large color variations. 
Lespedeza capitata
Lespedeza capitata. Seeds have large color variations. 
Lespedeza cuneata. Seed pods and calyces have appressed hairs; green seeds are flecked with purple. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Lespedeza cuneata. Seed pods and calyces have appressed hairs; green seeds are flecked with purple. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lespedeza cuneata
Lespedeza cuneata. Seed pods and calyces have appressed hairs; green seeds are flecked with purple. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lespedeza juncea. Seeds are often found in flat, single-seeded pods.  Lespedeza juncea. Seeds are often found in flat, single-seeded pods. 
Lespedeza juncea
Lespedeza juncea. Seeds are often found in flat, single-seeded pods. 
Leucaena retusa. Seeds with a strong circular line between the margin and the seeds' flat center.  Leucaena retusa. Seeds with a strong circular line between the margin and the seeds' flat center. 
Leucaena retusa
Leucaena retusa. Seeds with a strong circular line between the margin and the seeds' flat center.