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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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Chorispora tenella. A segment of the fruit enclosing a single seed.  Chorispora tenella. A segment of the fruit enclosing a single seed. 
Chorispora tenella
Chorispora tenella. A segment of the fruit enclosing a single seed. 
Chorispora tenella. The two faces of the seed. Hilum at top. Photo courtesy of USDA-APHIS-PPQ. Chorispora tenella. The two faces of the seed. Hilum at top. Photo courtesy of USDA-APHIS-PPQ.
Chorispora tenella
Chorispora tenella. The two faces of the seed. Hilum at top. Photo courtesy of USDA-APHIS-PPQ.
Chromolaena odorata. Achenes are black with a white scar, pappus, and ribs.  Chromolaena odorata. Achenes are black with a white scar, pappus, and ribs. 
Chromolaena odorata
Chromolaena odorata. Achenes are black with a white scar, pappus, and ribs. 
Chromolaena odorata. Achenes with barbed ribs. Chromolaena odorata. Achenes with barbed ribs.
Chromolaena odorata
Chromolaena odorata. Achenes with barbed ribs.

Chromolaena odorata.  Cypsela, showing flat face. Photo by Lindsey Seastone, Colorado State University Chromolaena odorata. Cypsela, showing flat face. Photo by Lindsey Seastone, Colorado State University
Chromolaena odorata
Chromolaena odorata. Cypsela, showing flat face. Photo by Lindsey Seastone, Colorado State University
Chrysopogon ciculatas . The base of the central floret is very hairy. Photo by Julia Scher, USDA-APHIS-PPQ. Chrysopogon ciculatas. The base of the central floret is very hairy. Photo by Julia Scher, USDA-APHIS-PPQ.
Chrysopogon aciculatus
Chrysopogon ciculatas. The base of the central floret is very hairy. Photo by Julia Scher, USDA-APHIS-PPQ.
Chrysopogon ciculatas . Two pedicel segments with two pedicel segments, with attached florets arising from the base of the floret. Photo by Julia Scher, USDA-APHIS-PPQ. Chrysopogon ciculatas. Two pedicel segments with two pedicel segments, with attached florets arising from the base of the floret. Photo by Julia Scher, USDA-APHIS-PPQ.
Chrysopogon aciculatus
Chrysopogon ciculatas. Two pedicel segments with two pedicel segments, with attached florets arising from the base of the floret. Photo by Julia Scher, USDA-APHIS-PPQ.
Chrysopogon ciculatas . Two pedicel segments with two pedicel segments, with attached florets arising from the base of the floret. Photo by Julia Scher, USDA-APHIS-PPQ. Chrysopogon ciculatas. Two pedicel segments with two pedicel segments, with attached florets arising from the base of the floret. Photo by Julia Scher, USDA-APHIS-PPQ.
Chrysopogon aciculatus
Chrysopogon ciculatas. Two pedicel segments with two pedicel segments, with attached florets arising from the base of the floret. Photo by Julia Scher, USDA-APHIS-PPQ.

Chrysothamnus viscidiflorus. Achenes with a spreading, barbed pappus when present. Chrysothamnus viscidiflorus. Achenes with a spreading, barbed pappus when present.
Chrysothamnus viscidiflorus
Chrysothamnus viscidiflorus. Achenes with a spreading, barbed pappus when present.
Chrysothamnus viscidiflorus. Achenes with thin longitudinal ribs and a surface covered with short hairs. Chrysothamnus viscidiflorus. Achenes with thin longitudinal ribs and a surface covered with short hairs.
Chrysothamnus viscidiflorus
Chrysothamnus viscidiflorus. Achenes with thin longitudinal ribs and a surface covered with short hairs.
Cichorium endivia. Achenes with short, oblong, scaly pappus.  Cichorium endivia. Achenes with short, oblong, scaly pappus. 
Cichorium endivia
Cichorium endivia. Achenes with short, oblong, scaly pappus. 
Cichorium intybus. Achenes with a short and scaly pappus. Cichorium intybus. Achenes with a short and scaly pappus.
Cichorium intybus
Cichorium intybus. Achenes with a short and scaly pappus.

Cichorium intybus. Achenes with minute lateral ridges and various numbers of longitudinal ribs.  Cichorium intybus. Achenes with minute lateral ridges and various numbers of longitudinal ribs. 
Cichorium intybus
Cichorium intybus. Achenes with minute lateral ridges and various numbers of longitudinal ribs. 
Cichorium intybus. Yellow achenes with various amounts of black. Cichorium intybus. Yellow achenes with various amounts of black.
Cichorium intybus
Cichorium intybus. Yellow achenes with various amounts of black.
Cicuta douglasii. The point of the mericarp attachment to the stem (stylopodium) is large. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Cicuta douglasii. The point of the mericarp attachment to the stem (stylopodium) is large. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Cicuta douglasii
Cicuta douglasii. The point of the mericarp attachment to the stem (stylopodium) is large. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Cicuta maculata.  Brown mericarps with dark brown stripes. Cicuta maculata. Brown mericarps with dark brown stripes.
Cicuta maculata
Cicuta maculata. Brown mericarps with dark brown stripes.

On the Top: Carduus nutans. From Left to Right: 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense . Achenes are brown, usually with a yellow collar and some yellow longitudinal lines.  On the Top: Carduus nutans. From Left to Right: 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense. Achenes are brown, usually with a yellow collar and some yellow longitudinal lines. 
Cirsium arvense
On the Top: Carduus nutans. From Left to Right: 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense. Achenes are brown, usually with a yellow collar and some yellow longitudinal lines. 
Cirsium arvense. Achenes are brown, usually with a yellow collar, some yellow longitudinal lines. Photo by Julia Scher, USDA-APHIS-PPQ. Cirsium arvense. Achenes are brown, usually with a yellow collar, some yellow longitudinal lines. Photo by Julia Scher, USDA-APHIS-PPQ.
Cirsium arvense
Cirsium arvense. Achenes are brown, usually with a yellow collar, some yellow longitudinal lines. Photo by Julia Scher, USDA-APHIS-PPQ.
Cirsium arvense. Achenes with a small stylar knob. Photo by Julia Scher, USDA-APHIS-PPQ. Cirsium arvense. Achenes with a small stylar knob. Photo by Julia Scher, USDA-APHIS-PPQ.
Cirsium arvense
Cirsium arvense. Achenes with a small stylar knob. Photo by Julia Scher, USDA-APHIS-PPQ.
Cirsium arvense. Seed hilum. Photo by Julia Scher, USDA-APHIS-PPQ. Cirsium arvense. Seed hilum. Photo by Julia Scher, USDA-APHIS-PPQ.
Cirsium arvense
Cirsium arvense. Seed hilum. Photo by Julia Scher, USDA-APHIS-PPQ.

Cirsium arvense . Achenes are curved with a small stylar knob and a basal scar.  Cirsium arvense. Achenes are curved with a small stylar knob and a basal scar. 
Cirsium arvense
Cirsium arvense. Achenes are curved with a small stylar knob and a basal scar. 
Cirsium ochrocentrum. Achenes with a strong, deep pappus crown and a long stylar knob. Photo by Julia Scher, USDA-APHIS-PPQ. Cirsium ochrocentrum. Achenes with a strong, deep pappus crown and a long stylar knob. Photo by Julia Scher, USDA-APHIS-PPQ.
Cirsium ochrocentrum
Cirsium ochrocentrum. Achenes with a strong, deep pappus crown and a long stylar knob. Photo by Julia Scher, USDA-APHIS-PPQ.
Cirsium undulatum. Yellow-brown achenes with a yellow apical rim. Cirsium undulatum. Yellow-brown achenes with a yellow apical rim.
Cirsium undulatum
Cirsium undulatum. Yellow-brown achenes with a yellow apical rim.
On the Top: Carduus nutans . From Left to Right: 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense . Achenes with many faint longitudinal ridges over a shiny but rough texture.  On the Top: Carduus nutans. From Left to Right: 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense. Achenes with many faint longitudinal ridges over a shiny but rough texture. 
Cirsium undulatum
On the Top: Carduus nutans. From Left to Right: 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense. Achenes with many faint longitudinal ridges over a shiny but rough texture. 

On the Top: Carduus nutans . From Left to Right: 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense . Achenes with a strong stylar knob. On the Top: Carduus nutans. From Left to Right: 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense. Achenes with a strong stylar knob.
Cirsium vulgare
On the Top: Carduus nutans. From Left to Right: 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense. Achenes with a strong stylar knob.
Cirsium vulgare. Achenes with a strong stylar knob. Cirsium vulgare. Achenes with a strong stylar knob.
Cirsium vulgare
Cirsium vulgare. Achenes with a strong stylar knob.
Cirsium vulgare. Achenes with a yellow apical rim. Photo by Julia Scher, USDA-APHIS-PPQ. Cirsium vulgare. Achenes with a yellow apical rim. Photo by Julia Scher, USDA-APHIS-PPQ.
Cirsium vulgare
Cirsium vulgare. Achenes with a yellow apical rim. Photo by Julia Scher, USDA-APHIS-PPQ.
Citrullus lanatus. Seeds with a rather corky and soft texture.  Citrullus lanatus. Seeds with a rather corky and soft texture. 
Citrullus lanatus
Citrullus lanatus. Seeds with a rather corky and soft texture. 

Clarkia amoena. The seeds are covered with scales or short, stiff hairs. Clarkia amoena. The seeds are covered with scales or short, stiff hairs.
Clarkia amoena
Clarkia amoena. The seeds are covered with scales or short, stiff hairs.
Clarkia amoena. The seeds are covered with scales or short, stiff hairs. Clarkia amoena. The seeds are covered with scales or short, stiff hairs.
Clarkia amoena
Clarkia amoena. The seeds are covered with scales or short, stiff hairs.
Clarkia speciosa. The seed hilum is on the flat surface of the entire length of the seed. Clarkia speciosa. The seed hilum is on the flat surface of the entire length of the seed.
Clarkia speciosa
Clarkia speciosa. The seed hilum is on the flat surface of the entire length of the seed.
Clarkia unguiculata. The Seed surface is covered with irregular tubercles or scales. Clarkia unguiculata. The Seed surface is covered with irregular tubercles or scales.
Clarkia unguiculata
Clarkia unguiculata. The Seed surface is covered with irregular tubercles or scales.

Clematis orientalis. Achenes with a long, hairy apical awn. Clematis orientalis. Achenes with a long, hairy apical awn.
Clematis orientalis
Clematis orientalis. Achenes with a long, hairy apical awn.
Clematis orientalis. Achenes with a long, hairy apical awn. Clematis orientalis. Achenes with a long, hairy apical awn.
Clematis orientalis
Clematis orientalis. Achenes with a long, hairy apical awn.
Cleome hassleriana.  True seeds with a deep hilum cavity between the radicle and cotyledon lobe ends. Cleome hassleriana. True seeds with a deep hilum cavity between the radicle and cotyledon lobe ends.
Cleome hassleriana
Cleome hassleriana. True seeds with a deep hilum cavity between the radicle and cotyledon lobe ends.
Cleome hassleriana.  True seeds with irregular colors. Cleome hassleriana. True seeds with irregular colors.
Cleome hassleriana
Cleome hassleriana. True seeds with irregular colors.

Cleome isomeris.  True seeds with large grooves on either side of the radicle lobe. Cleome isomeris. True seeds with large grooves on either side of the radicle lobe.
Cleome isomeris
Cleome isomeris. True seeds with large grooves on either side of the radicle lobe.
Cleretum bellidiforme. The seed surface alternates between smooth and tuberculate patches. Cleretum bellidiforme. The seed surface alternates between smooth and tuberculate patches.
Cleretum bellidiforme
Cleretum bellidiforme. The seed surface alternates between smooth and tuberculate patches.
Cleretum bellidiforme. Seeds with pointed ends that appear folded. Cleretum bellidiforme. Seeds with pointed ends that appear folded.
Cleretum bellidiforme
Cleretum bellidiforme. Seeds with pointed ends that appear folded.
Cleretum bellidiforme. Basal view of seed. Hilum visible. Photo by Madeline Maher, USDA-APHIS-PPQ. Cleretum bellidiforme. Basal view of seed. Hilum visible. Photo by Madeline Maher, USDA-APHIS-PPQ.
Cleretum bellidiforme
Cleretum bellidiforme. Basal view of seed. Hilum visible. Photo by Madeline Maher, USDA-APHIS-PPQ.