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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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Centaurea sulphurea. Pointed, hooked achenes with a black pappus. Centaurea sulphurea. Pointed, hooked achenes with a black pappus.
Centaurea sulphurea
Centaurea sulphurea. Pointed, hooked achenes with a black pappus.
Centaurea virgata ssp . squarrosa. Achenes with a light, bristly pappus. Centaurea virgata ssp. squarrosa. Achenes with a light, bristly pappus.
Centaurea virgata subsp. squarrosa
Centaurea virgata ssp. squarrosa. Achenes with a light, bristly pappus.
Cerastium biebersteinii. Seeds with stipples in reticulation are often arranged in rows. Cerastium biebersteinii. Seeds with stipples in reticulation are often arranged in rows.
Cerastium biebersteinii
Cerastium biebersteinii. Seeds with stipples in reticulation are often arranged in rows.
Cerastium fontanum ssp. vulgare. Seeds with irregular tubercles with minute projections.  Cerastium fontanum ssp. vulgare. Seeds with irregular tubercles with minute projections. 
Cerastium fontanum subsp. vulgare
Cerastium fontanum ssp. vulgare. Seeds with irregular tubercles with minute projections. 

Cercocarpus montanus var. montanus. Achenes are covered with white, appressed hairs. Cercocarpus montanus var. montanus. Achenes are covered with white, appressed hairs.
Cercocarpus montanus var. montanus
Cercocarpus montanus var. montanus. Achenes are covered with white, appressed hairs.
Cerinthe major. Nutlets with a large, heart-shaped attachment area, which is flat and light colored. Cerinthe major. Nutlets with a large, heart-shaped attachment area, which is flat and light colored.
Cerinthe major
Cerinthe major. Nutlets with a large, heart-shaped attachment area, which is flat and light colored.
Chaerophyllum sp. Mericarps with yellow ribs and brown interspaces.  Chaerophyllum sp. Mericarps with yellow ribs and brown interspaces. 
Chaerophyllum sp.
Chaerophyllum sp. Mericarps with yellow ribs and brown interspaces. 
Chaerophyllum tainturieri. Mericarps with ribs and a sharply pointed base. Chaerophyllum tainturieri. Mericarps with ribs and a sharply pointed base.
Chaerophyllum tainturieri
Chaerophyllum tainturieri. Mericarps with ribs and a sharply pointed base.

Chamaecrista fasciculata. Seeds are smooth and punctate with rows of small depressions curving from the apex to the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Chamaecrista fasciculata. Seeds are smooth and punctate with rows of small depressions curving from the apex to the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Chamaecrista fasciculata
Chamaecrista fasciculata. Seeds are smooth and punctate with rows of small depressions curving from the apex to the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Chamaecrista fasciculata. Seeds are black and brown mottled, with light brown edges, and a black and brown hilum and apex. Chamaecrista fasciculata. Seeds are black and brown mottled, with light brown edges, and a black and brown hilum and apex.
Chamaecrista fasciculata
Chamaecrista fasciculata. Seeds are black and brown mottled, with light brown edges, and a black and brown hilum and apex.
Chamaecrista nictitans. Seeds' surface is covered with checks or fine cracks.  Chamaecrista nictitans. Seeds' surface is covered with checks or fine cracks. 
Chamaecrista nictitans
Chamaecrista nictitans. Seeds' surface is covered with checks or fine cracks. 
Chamaecrista nictitans. Shiny seeds with rows of dimples. Chamaecrista nictitans. Shiny seeds with rows of dimples.
Chamaecrista nictitans
Chamaecrista nictitans. Shiny seeds with rows of dimples.

Chamaemelum nobile.  Finely reticulated, oblanceolate achene. Chamaemelum nobile. Finely reticulated, oblanceolate achene.
Chamaemelum nobile
Chamaemelum nobile. Finely reticulated, oblanceolate achene.
Chamaemelum nobile.  Longitudinal ribs are light colored. Chamaemelum nobile. Longitudinal ribs are light colored.
Chamaemelum nobile
Chamaemelum nobile. Longitudinal ribs are light colored.
Chamaesyce maculata. Seeds are covered with large lateral waves. Chamaesyce maculata. Seeds are covered with large lateral waves.
Chamaesyce maculata
Chamaesyce maculata. Seeds are covered with large lateral waves.
Chamaesyce maculata. Looking down on the hilar end of two seeds. Photo courtesy of USDA-APHIS-PPQ. Chamaesyce maculata. Looking down on the hilar end of two seeds. Photo courtesy of USDA-APHIS-PPQ.
Chamaesyce maculata
Chamaesyce maculata. Looking down on the hilar end of two seeds. Photo courtesy of USDA-APHIS-PPQ.

Chamaesyce nutans. Seeds with two longitudinal ribs and one groove. Chamaesyce nutans. Seeds with two longitudinal ribs and one groove.
Chamaesyce nutans
Chamaesyce nutans. Seeds with two longitudinal ribs and one groove.
Chamaesyce prostrata. Seeds with two longitudinal ribs and one groove. Chamaesyce prostrata. Seeds with two longitudinal ribs and one groove.
Chamaesyce prostrata
Chamaesyce prostrata. Seeds with two longitudinal ribs and one groove.
Chamerion angustifolium  ssp. angustifolium. Seeds with longitudinal rows of small reticulations. Chamerion angustifolium ssp. angustifolium. Seeds with longitudinal rows of small reticulations.
Chamerion angustifolium subsp. angustifolium
Chamerion angustifolium ssp. angustifolium. Seeds with longitudinal rows of small reticulations.
Chenopodium album. Smooth, shiny black seeds with reticulate pericarps and scurfy sepals. Chenopodium album. Smooth, shiny black seeds with reticulate pericarps and scurfy sepals.
Chenopodium album
Chenopodium album. Smooth, shiny black seeds with reticulate pericarps and scurfy sepals.

Chenopodium album . Apex (left) and base (right) of two fruits without attached calyx bracts. Photo courtesy of USDA-APHIS-PPQ. Chenopodium album. Apex (left) and base (right) of two fruits without attached calyx bracts. Photo courtesy of USDA-APHIS-PPQ.
Chenopodium album
Chenopodium album. Apex (left) and base (right) of two fruits without attached calyx bracts. Photo courtesy of USDA-APHIS-PPQ.
Chenopodium berlandieri. Yellow pericarp and sepals. Chenopodium berlandieri. Yellow pericarp and sepals.
Chenopodium berlandieri
Chenopodium berlandieri. Yellow pericarp and sepals.
Chenopodium berlandieri . Face view of fruit, utricle. Photo by Madeline Maher, USDA-APHIS-PPQ. Chenopodium berlandieri. Face view of fruit, utricle. Photo by Madeline Maher, USDA-APHIS-PPQ.
Chenopodium berlandieri
Chenopodium berlandieri. Face view of fruit, utricle. Photo by Madeline Maher, USDA-APHIS-PPQ.
Chenopodium capitatum. The white hilum is located on the seed margin. Chenopodium capitatum. The white hilum is located on the seed margin.
Chenopodium capitatum
Chenopodium capitatum. The white hilum is located on the seed margin.

Chenopodium capitatum. Seed pods. Chenopodium capitatum. Seed pods.
Chenopodium capitatum
Chenopodium capitatum. Seed pods.
Chenopodium fremontii. Seeds are closely covered with a seed coat or a pointed pericarp.  Chenopodium fremontii. Seeds are closely covered with a seed coat or a pointed pericarp. 
Chenopodium fremontii
Chenopodium fremontii. Seeds are closely covered with a seed coat or a pointed pericarp. 
Chenopodium hircinum. Seeds are often covered with a fruit coat with white mottling radiating from the center. Chenopodium hircinum. Seeds are often covered with a fruit coat with white mottling radiating from the center.
Chenopodium hircinum
Chenopodium hircinum. Seeds are often covered with a fruit coat with white mottling radiating from the center.
Chenopodium leptophyllum. Seeds with a distinct margin between the radicle and cotyledon lobe endings. Pericarp presents. Chenopodium leptophyllum. Seeds with a distinct margin between the radicle and cotyledon lobe endings. Pericarp presents.
Chenopodium leptophyllum
Chenopodium leptophyllum. Seeds with a distinct margin between the radicle and cotyledon lobe endings. Pericarp presents.

Chenopodium leptophyllum. Black seeds and pericarps. Chenopodium leptophyllum. Black seeds and pericarps.
Chenopodium leptophyllum
Chenopodium leptophyllum. Black seeds and pericarps.
Chenopodium quinoa. Seeds with the pericarp. Chenopodium quinoa. Seeds with the pericarp.
Chenopodium quinoa
Chenopodium quinoa. Seeds with the pericarp.
Chenopodium quinoa . Multiple views of fruit.  Seeds and utricles, with widely-varying pericarp color and testa color. Photo by Madeline Maher, USDA-APHIS-PPQ. Chenopodium quinoa. Multiple views of fruit.  Seeds and utricles, with widely-varying pericarp color and testa color. Photo by Madeline Maher, USDA-APHIS-PPQ.
Chenopodium quinoa
Chenopodium quinoa. Multiple views of fruit.  Seeds and utricles, with widely-varying pericarp color and testa color. Photo by Madeline Maher, USDA-APHIS-PPQ.
Chilopsis linearis. Seeds with long, silky hairs on both ends of the oval. Chilopsis linearis. Seeds with long, silky hairs on both ends of the oval.
Chilopsis linearis
Chilopsis linearis. Seeds with long, silky hairs on both ends of the oval.

Chilopsis linearis.  Hilum. Photo by Norma Diaz, USDA-APHIS-PPQ. Chilopsis linearis. Hilum. Photo by Norma Diaz, USDA-APHIS-PPQ.
Chilopsis linearis
Chilopsis linearis. Hilum. Photo by Norma Diaz, USDA-APHIS-PPQ.
Chloris divaricata. Florets with a white base. Chloris divaricata. Florets with a white base.
Chloris divaricata
Chloris divaricata. Florets with a white base.
Chloris elata. Florets with long, silky hairs on the lemma. Chloris elata. Florets with long, silky hairs on the lemma.
Chloris elata
Chloris elata. Florets with long, silky hairs on the lemma.
Chloris elata. Florets with long, silky hairs on the lemma. Chloris elata. Florets with long, silky hairs on the lemma.
Chloris elata
Chloris elata. Florets with long, silky hairs on the lemma.

Chloris gayana. Florets are smooth with hairs at the upper margins and the central nerve of the lemma. Chloris gayana. Florets are smooth with hairs at the upper margins and the central nerve of the lemma.
Chloris gayana
Chloris gayana. Florets are smooth with hairs at the upper margins and the central nerve of the lemma.
Chloris gayana. Florets are smooth with hairs at the upper margins and the central nerve of the lemma. Brown caryopses. Chloris gayana. Florets are smooth with hairs at the upper margins and the central nerve of the lemma. Brown caryopses.
Chloris gayana
Chloris gayana. Florets are smooth with hairs at the upper margins and the central nerve of the lemma. Brown caryopses.
Chondrilla juncea. Achenes with rings of small spines, which increase in size as the rings get closer to the apex.  Chondrilla juncea. Achenes with rings of small spines, which increase in size as the rings get closer to the apex. 
Chondrilla juncea
Chondrilla juncea. Achenes with rings of small spines, which increase in size as the rings get closer to the apex. 
Chondrilla juncea . Lateral view of fruit.  Photo courtesy of USDA-APHIS-PPQ. Chondrilla juncea. Lateral view of fruit.  Photo courtesy of USDA-APHIS-PPQ.
Chondrilla juncea
Chondrilla juncea. Lateral view of fruit.  Photo courtesy of USDA-APHIS-PPQ.