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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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Convolvulus tricolor. Seeds have three surfaces: two adjacent and flat, and one rounded. Photo by Julia Scher, USDA-APHIS-PPQ. Convolvulus tricolor. Seeds have three surfaces: two adjacent and flat, and one rounded. Photo by Julia Scher, USDA-APHIS-PPQ.
Convolvulus tricolor
Convolvulus tricolor. Seeds have three surfaces: two adjacent and flat, and one rounded. Photo by Julia Scher, USDA-APHIS-PPQ.
Convolvulus tricolor. Seeds with a small, oblique hilum. Photo by Julia Scher, USDA-APHIS-PPQ. Convolvulus tricolor. Seeds with a small, oblique hilum. Photo by Julia Scher, USDA-APHIS-PPQ.
Convolvulus tricolor
Convolvulus tricolor. Seeds with a small, oblique hilum. Photo by Julia Scher, USDA-APHIS-PPQ.
Coreopsis gigantea. Achenes with longitudinal lines. Coreopsis gigantea. Achenes with longitudinal lines.
Coreopsis gigantea
Coreopsis gigantea. Achenes with longitudinal lines.
Coreopsis lanceolata. Achenes with large tubers on the ventral ends. Coreopsis lanceolata. Achenes with large tubers on the ventral ends.
Coreopsis lanceolata
Coreopsis lanceolata. Achenes with large tubers on the ventral ends.

Coreopsis lanceolata. Achenes with broadly winged lateral margins. Coreopsis lanceolata. Achenes with broadly winged lateral margins.
Coreopsis lanceolata
Coreopsis lanceolata. Achenes with broadly winged lateral margins.
Coreopsis lanceolata. Cypselae. Photo by Ana Margina, USDA-APHIS-PPQ. Coreopsis lanceolata. Cypselae. Photo by Ana Margina, USDA-APHIS-PPQ.
Coreopsis lanceolata
Coreopsis lanceolata. Cypselae. Photo by Ana Margina, USDA-APHIS-PPQ.
Coreopsis palmata. Achenes with a white margin and black center. Coreopsis palmata. Achenes with a white margin and black center.
Coreopsis palmata
Coreopsis palmata. Achenes with a white margin and black center.
Coreopsis tinctoria. Black achenes with light brown tubercles. Coreopsis tinctoria. Black achenes with light brown tubercles.
Coreopsis tinctoria
Coreopsis tinctoria. Black achenes with light brown tubercles.

Coreopsis tripteris. Achenes with narrow marginal wings. Coreopsis tripteris. Achenes with narrow marginal wings.
Coreopsis tripteris
Coreopsis tripteris. Achenes with narrow marginal wings.
Coriandrum sativum. Mericarps with the schizocarp often present. Coriandrum sativum. Mericarps with the schizocarp often present.
Coriandrum sativum
Coriandrum sativum. Mericarps with the schizocarp often present.
Coriandrum sativum. Mericarps with the schizocarp often present. Coriandrum sativum. Mericarps with the schizocarp often present.
Coriandrum sativum
Coriandrum sativum. Mericarps with the schizocarp often present.
Coriandrum sativum. Ventral/adaxial view. Seed in mericarp shell. Photo by Ana Margina, USDA-APHIS-PPQ. Coriandrum sativum. Ventral/adaxial view. Seed in mericarp shell. Photo by Ana Margina, USDA-APHIS-PPQ.
Coriandrum sativum
Coriandrum sativum. Ventral/adaxial view. Seed in mericarp shell. Photo by Ana Margina, USDA-APHIS-PPQ.

Cosmos bipinnatus. Achenes with minutely grooved ribs. Cosmos bipinnatus. Achenes with minutely grooved ribs.
Cosmos bipinnatus
Cosmos bipinnatus. Achenes with minutely grooved ribs.
Cosmos bipinnatus. Pappus of barbed awns at top of cypsela. Photo by courtesy of USDA-APHIS-PPQ. Cosmos bipinnatus. Pappus of barbed awns at top of cypsela. Photo by courtesy of USDA-APHIS-PPQ.
Cosmos bipinnatus
Cosmos bipinnatus. Pappus of barbed awns at top of cypsela. Photo by courtesy of USDA-APHIS-PPQ.
Cosmos sulphureus.  Oblanceolate and slightly curved achenes. Cosmos sulphureus. Oblanceolate and slightly curved achenes.
Cosmos sulphureus
Cosmos sulphureus. Oblanceolate and slightly curved achenes.
Cosmos sulphureus.  Close-up view of barbed surface texture near ribs. Photo by Norma Diaz, USDA-APHIS-PPQ. Cosmos sulphureus. Close-up view of barbed surface texture near ribs. Photo by Norma Diaz, USDA-APHIS-PPQ.
Cosmos sulphureus
Cosmos sulphureus. Close-up view of barbed surface texture near ribs. Photo by Norma Diaz, USDA-APHIS-PPQ.

Crambe hispanica.  The silicle is spherical and contains one seed, which is also spherical. The silicle is yellow, and the seed is black. Crambe hispanica. The silicle is spherical and contains one seed, which is also spherical. The silicle is yellow, and the seed is black.
Crambe hispanica
Crambe hispanica. The silicle is spherical and contains one seed, which is also spherical. The silicle is yellow, and the seed is black.
Crepis capillaris. Achenes with widely spaced ribs that are serrated. Crepis capillaris. Achenes with widely spaced ribs that are serrated.
Crepis capillaris
Crepis capillaris. Achenes with widely spaced ribs that are serrated.
Crotalaria longirostrata. Seeds with a divergent radicle lobe with a slight hook, which partially covers the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Crotalaria longirostrata. Seeds with a divergent radicle lobe with a slight hook, which partially covers the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Crotalaria longirostrata
Crotalaria longirostrata. Seeds with a divergent radicle lobe with a slight hook, which partially covers the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Crotalaria pallida. Seeds with a large and divergent radicle lobe, that's not hooked. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Crotalaria pallida. Seeds with a large and divergent radicle lobe, that's not hooked. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Crotalaria pallida
Crotalaria pallida. Seeds with a large and divergent radicle lobe, that's not hooked. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Crotalaria sagittalis. Seeds with a slight hook in the radicle lobe. Crotalaria sagittalis. Seeds with a slight hook in the radicle lobe.
Crotalaria sagittalis
Crotalaria sagittalis. Seeds with a slight hook in the radicle lobe.
Crotalaria spectabilis. Seeds with a whitish covering associated with the hilum area that is conspicuous and often appears as though the surface is cracked. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Crotalaria spectabilis. Seeds with a whitish covering associated with the hilum area that is conspicuous and often appears as though the surface is cracked. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Crotalaria spectabilis
Crotalaria spectabilis. Seeds with a whitish covering associated with the hilum area that is conspicuous and often appears as though the surface is cracked. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Croton setigerus. Seeds are brown with various black mottling. Croton setigerus. Seeds are brown with various black mottling.
Croton setigerus
Croton setigerus. Seeds are brown with various black mottling.
Croton setigerus. Close-up of hilum and raphe. Photo courtesy of USDA-APHIS-PPQ. Croton setigerus. Close-up of hilum and raphe. Photo courtesy of USDA-APHIS-PPQ.
Croton setigerus
Croton setigerus. Close-up of hilum and raphe. Photo courtesy of USDA-APHIS-PPQ.

Crupina crupinastrum. Achenes with a straight, thick, black, and brown pappus. Photo by Julia Scher, USDA-APHIS-PPQ. Crupina crupinastrum. Achenes with a straight, thick, black, and brown pappus. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina crupinastrum
Crupina crupinastrum. Achenes with a straight, thick, black, and brown pappus. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina crupinastrum. Achenes that are hairy, soft, and scurfy at the base. Photo by Julia Scher, USDA-APHIS-PPQ. Crupina crupinastrum. Achenes that are hairy, soft, and scurfy at the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina crupinastrum
Crupina crupinastrum. Achenes that are hairy, soft, and scurfy at the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina crupinastrum. Achenes that are hairy, soft, and scurfy at the base. Photo by Julia Scher, USDA-APHIS-PPQ. Crupina crupinastrum. Achenes that are hairy, soft, and scurfy at the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina crupinastrum
Crupina crupinastrum. Achenes that are hairy, soft, and scurfy at the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina vulgaris. Achenes are black with a light colored band at the apex. Photo by Julia Scher, USDA-APHIS-PPQ. Crupina vulgaris. Achenes are black with a light colored band at the apex. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina vulgaris
Crupina vulgaris. Achenes are black with a light colored band at the apex. Photo by Julia Scher, USDA-APHIS-PPQ.

Crupina vulgaris. Achenes are black with a light colored band at the apex. Photo by Julia Scher, USDA-APHIS-PPQ. Crupina vulgaris. Achenes are black with a light colored band at the apex. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina vulgaris
Crupina vulgaris. Achenes are black with a light colored band at the apex. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina vulgaris. Achenes with a ring of black bristles for a pappus. Photo by Julia Scher, USDA-APHIS-PPQ. Crupina vulgaris. Achenes with a ring of black bristles for a pappus. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina vulgaris
Crupina vulgaris. Achenes with a ring of black bristles for a pappus. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina vulgaris. Achenes' collar and stylar lobe can be seen from above the pappus ring. Photo by Julia Scher, USDA-APHIS-PPQ. Crupina vulgaris. Achenes' collar and stylar lobe can be seen from above the pappus ring. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina vulgaris
Crupina vulgaris. Achenes' collar and stylar lobe can be seen from above the pappus ring. Photo by Julia Scher, USDA-APHIS-PPQ.
Crupina vulgaris. Achenes with a ring of black bristles for a pappus.  Crupina vulgaris. Achenes with a ring of black bristles for a pappus. 
Crupina vulgaris
Crupina vulgaris. Achenes with a ring of black bristles for a pappus. 

Cryptantha virgata. Nutlets with transverse and irregular ribs. Cryptantha virgata. Nutlets with transverse and irregular ribs.
Cryptantha virgata
Cryptantha virgata. Nutlets with transverse and irregular ribs.
Cucumis melo. Yellow seeds that are elongated ovals with marginal wings at the base and a rounded apical end.  Cucumis melo. Yellow seeds that are elongated ovals with marginal wings at the base and a rounded apical end. 
Cucumis melo
Cucumis melo. Yellow seeds that are elongated ovals with marginal wings at the base and a rounded apical end. 
Cucumis melo subsp . agrestis var. dudaim. White seeds that are somewhat oval with a very slight point at the apex.  Cucumis melo subsp. agrestis var. dudaim. White seeds that are somewhat oval with a very slight point at the apex. 
Cucumis melo subsp. agrestis var. dudaim
Cucumis melo subsp. agrestis var. dudaim. White seeds that are somewhat oval with a very slight point at the apex. 
Cucumis sativus. Seeds with a winged margin at the hilum end, and an acutely angled apex. Cucumis sativus. Seeds with a winged margin at the hilum end, and an acutely angled apex.
Cucumis sativus
Cucumis sativus. Seeds with a winged margin at the hilum end, and an acutely angled apex.

Cucurbita foetidissima. Seeds that often have fragments of the fruit tissue dried on the surface. Cucurbita foetidissima. Seeds that often have fragments of the fruit tissue dried on the surface.
Cucurbita foetidissima
Cucurbita foetidissima. Seeds that often have fragments of the fruit tissue dried on the surface.
Cucurbita maxima. Seeds with a perimeter groove that is just inside the margin.  Cucurbita maxima. Seeds with a perimeter groove that is just inside the margin. 
Cucurbita maxima
Cucurbita maxima. Seeds with a perimeter groove that is just inside the margin. 
Cucurbita moschata. Seeds with the hilum at the end of the extended neck, and a groove that follows the seed margin.  Cucurbita moschata. Seeds with the hilum at the end of the extended neck, and a groove that follows the seed margin. 
Cucurbita moschata
Cucurbita moschata. Seeds with the hilum at the end of the extended neck, and a groove that follows the seed margin. 
Cucurbita pepo. Seeds with a broad, wrinkled groove following the margin.  Cucurbita pepo. Seeds with a broad, wrinkled groove following the margin. 
Cucurbita pepo
Cucurbita pepo. Seeds with a broad, wrinkled groove following the margin.