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Noxious Weed Seed

AOSA Examination List

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Cynara cardunculus. Achenes are gray with yellow or black longitudinal lines and various degrees of black mottling between the lines. Cynara cardunculus. Achenes are gray with yellow or black longitudinal lines and various degrees of black mottling between the lines.
Cynara cardunculus
Cynara cardunculus. Achenes are gray with yellow or black longitudinal lines and various degrees of black mottling between the lines.
Cynara cardunculus. Achenes are gray with some yellow lines, black lines, and black spots.  Cynara cardunculus. Achenes are gray with some yellow lines, black lines, and black spots. 
Cynara cardunculus
Cynara cardunculus. Achenes are gray with some yellow lines, black lines, and black spots. 
From Left to Right: 1. Cynodon dactylon var. aridus 2. Cynodon dactylon var. dactylon . Caryopses are glossy, smooth, and laterally compressed. From Left to Right: 1. Cynodon dactylon var. aridus 2. Cynodon dactylon var. dactylon. Caryopses are glossy, smooth, and laterally compressed.
Cynodon dactylon var. aridus
From Left to Right: 1. Cynodon dactylon var. aridus 2. Cynodon dactylon var. dactylon. Caryopses are glossy, smooth, and laterally compressed.
Cynodon dactylon var. aridus. Dark brown caryopsis and a light brown floret.  Cynodon dactylon var. aridus. Dark brown caryopsis and a light brown floret. 
Cynodon dactylon var. aridus
Cynodon dactylon var. aridus. Dark brown caryopsis and a light brown floret. 

Cynodon dactylon var. aridus. Caryopses are moderately rough. Cynodon dactylon var. aridus. Caryopses are moderately rough.
Cynodon dactylon var. aridus
Cynodon dactylon var. aridus. Caryopses are moderately rough.
From Left to Right: 1. Cynodon dactylon var. aridus 2. Cynodon dactylon var. dactylon . Caryopses are glossy, smooth, and laterally compressed. From Left to Right: 1. Cynodon dactylon var. aridus 2. Cynodon dactylon var. dactylon. Caryopses are glossy, smooth, and laterally compressed.
Cynodon dactylon var. dactylon
From Left to Right: 1. Cynodon dactylon var. aridus 2. Cynodon dactylon var. dactylon. Caryopses are glossy, smooth, and laterally compressed.
Cynodon dactylon var. dactylon. Caryopses are glossy and smooth. Cynodon dactylon var. dactylon. Caryopses are glossy and smooth.
Cynodon dactylon var. dactylon
Cynodon dactylon var. dactylon. Caryopses are glossy and smooth.
Cynoglossum amabile. Nutlets with barbed spines at the ends. Cynoglossum amabile. Nutlets with barbed spines at the ends.
Cynoglossum amabile
Cynoglossum amabile. Nutlets with barbed spines at the ends.

Cynoglossum officinale. Nutlets are covered with large tubercles with crowns of retro-pointed spines.  Cynoglossum officinale. Nutlets are covered with large tubercles with crowns of retro-pointed spines. 
Cynoglossum officinale
Cynoglossum officinale. Nutlets are covered with large tubercles with crowns of retro-pointed spines. 
Cynosurus cristatus. Florets are coarsely granular with short hispid hairs on the apex of the lemma.  Cynosurus cristatus. Florets are coarsely granular with short hispid hairs on the apex of the lemma. 
Cynosurus cristatus
Cynosurus cristatus. Florets are coarsely granular with short hispid hairs on the apex of the lemma. 
Cyperus esculentus. Achenes are three-sided and are borne between one or two bracts. Cyperus esculentus. Achenes are three-sided and are borne between one or two bracts.
Cyperus esculentus
Cyperus esculentus. Achenes are three-sided and are borne between one or two bracts.
Cyperus esculentus. Achenes are smooth with interspersed honeycomb dots with dark borders. Cyperus esculentus. Achenes are smooth with interspersed honeycomb dots with dark borders.
Cyperus esculentus
Cyperus esculentus. Achenes are smooth with interspersed honeycomb dots with dark borders.

Cyperus rotundus. Achenes are strongly three-sided with a smooth surface that is covered with underlying dots arranged in a honeycomb pattern.  Cyperus rotundus. Achenes are strongly three-sided with a smooth surface that is covered with underlying dots arranged in a honeycomb pattern. 
Cyperus rotundus
Cyperus rotundus. Achenes are strongly three-sided with a smooth surface that is covered with underlying dots arranged in a honeycomb pattern. 
Cyperus rotundus. Achenes are strongly three-sided with a smooth surface that is covered with underlying dots arranged in a honeycomb pattern.  Cyperus rotundus. Achenes are strongly three-sided with a smooth surface that is covered with underlying dots arranged in a honeycomb pattern. 
Cyperus rotundus
Cyperus rotundus. Achenes are strongly three-sided with a smooth surface that is covered with underlying dots arranged in a honeycomb pattern. 
Cyperus sp. Tubers are vegetative means of producing new plants in this genus.  Cyperus sp. Tubers are vegetative means of producing new plants in this genus. 
Cyperus sp.
Cyperus sp. Tubers are vegetative means of producing new plants in this genus. 
Cyperus sp. The covering (perigynium) for the achene is highly ornamented along its margin.  Cyperus sp. The covering (perigynium) for the achene is highly ornamented along its margin. 
Cyperus sp.
Cyperus sp. The covering (perigynium) for the achene is highly ornamented along its margin. 

Cypripedium parviflorum var. pubescens. Seeds surrounded by a transparent net. Cypripedium parviflorum var. pubescens. Seeds surrounded by a transparent net.
Cypripedium parviflorum var. pubescens
Cypripedium parviflorum var. pubescens. Seeds surrounded by a transparent net.
Cytisus scoparius. Seeds with an aril covering the hilum area, which is waxy and a lighter, yellowish-white than the rest of the seed. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Cytisus scoparius. Seeds with an aril covering the hilum area, which is waxy and a lighter, yellowish-white than the rest of the seed. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Cytisus scoparius
Cytisus scoparius. Seeds with an aril covering the hilum area, which is waxy and a lighter, yellowish-white than the rest of the seed. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Dactylis glomerata. Florets are smooth with a keel nerve strongly ciliate towards the apex.  Dactylis glomerata. Florets are smooth with a keel nerve strongly ciliate towards the apex. 
Dactylis glomerata
Dactylis glomerata. Florets are smooth with a keel nerve strongly ciliate towards the apex. 
Dactylis glomerata. Dorsal / abaxial view of fruit. Caryopses in dorsal view showing embryo at base. Photo courtesy of USDA-APHIS-PPQ. Dactylis glomerata. Dorsal / abaxial view of fruit. Caryopses in dorsal view showing embryo at base. Photo courtesy of USDA-APHIS-PPQ.
Dactylis glomerata
Dactylis glomerata. Dorsal / abaxial view of fruit. Caryopses in dorsal view showing embryo at base. Photo courtesy of USDA-APHIS-PPQ.

Dahlia sp. Achenes light colored pappus crowns and bases. Dahlia sp. Achenes light colored pappus crowns and bases.
Dahlia sp.
Dahlia sp. Achenes light colored pappus crowns and bases.
Dalea candida. Seeds with a fruit coat and calyx that are often present. Dalea candida. Seeds with a fruit coat and calyx that are often present.
Dalea candida
Dalea candida. Seeds with a fruit coat and calyx that are often present.
Dalea purpurea. Seeds are often in a hairy calyx. Dalea purpurea. Seeds are often in a hairy calyx.
Dalea purpurea
Dalea purpurea. Seeds are often in a hairy calyx.
Dalea purpurea. Seeds with axes of the radicle and cotyledon lobes that are nearly at right angles to each other.  Dalea purpurea. Seeds with axes of the radicle and cotyledon lobes that are nearly at right angles to each other. 
Dalea purpurea
Dalea purpurea. Seeds with axes of the radicle and cotyledon lobes that are nearly at right angles to each other. 

Danthonia intermedia.  Florets with a lemma that is split on the apical end, forming two lateral pointed awns. Danthonia intermedia. Florets with a lemma that is split on the apical end, forming two lateral pointed awns.
Danthonia intermedia
Danthonia intermedia. Florets with a lemma that is split on the apical end, forming two lateral pointed awns.
Datura quercifolia . Seeds have coarse reticulations covered with fine reticulations. Datura quercifolia. Seeds have coarse reticulations covered with fine reticulations.
Datura quercifolia
Datura quercifolia. Seeds have coarse reticulations covered with fine reticulations.
Datura quercifolia . Close-up view of seed surface reticulations. Photo by Norma Diaz, USDA-APHIS-PPQ. Datura quercifolia. Close-up view of seed surface reticulations. Photo by Norma Diaz, USDA-APHIS-PPQ.
Datura quercifolia
Datura quercifolia. Close-up view of seed surface reticulations. Photo by Norma Diaz, USDA-APHIS-PPQ.
Datura stramonium . Reticulum is thick; the interspaces are shallow. The margin is laterally rounded.  Datura stramonium. Reticulum is thick; the interspaces are shallow. The margin is laterally rounded. 
Datura stramonium
Datura stramonium. Reticulum is thick; the interspaces are shallow. The margin is laterally rounded. 

Datura stramonium.  Reticulum is thick; the interspaces are shallow. The margin is laterally rounded. Photo by Shannon E. Jarman, USDA APHIS-PPQ. Datura stramonium. Reticulum is thick; the interspaces are shallow. The margin is laterally rounded. Photo by Shannon E. Jarman, USDA APHIS-PPQ.
Datura stramonium
Datura stramonium. Reticulum is thick; the interspaces are shallow. The margin is laterally rounded. Photo by Shannon E. Jarman, USDA APHIS-PPQ.
Datura wrightii. Seeds with a strong groove following the margin on the seed perimeter. Datura wrightii. Seeds with a strong groove following the margin on the seed perimeter.
Datura wrightii
Datura wrightii. Seeds with a strong groove following the margin on the seed perimeter.
Daucus carota. Mericarps with ridges with long straplike appendages, which are often broken off by conditioning. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Daucus carota. Mericarps with ridges with long straplike appendages, which are often broken off by conditioning. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Daucus carota
Daucus carota. Mericarps with ridges with long straplike appendages, which are often broken off by conditioning. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Daucus carota var. carota. Mericarps with ribs that have appendages, long spines, or bristles.  Daucus carota var. carota. Mericarps with ribs that have appendages, long spines, or bristles. 
Daucus carota var. carota
Daucus carota var. carota. Mericarps with ribs that have appendages, long spines, or bristles. 

Delphinium bicolor. Seeds are black with a gray-yellow edge.  Delphinium bicolor. Seeds are black with a gray-yellow edge. 
Delphinium bicolor
Delphinium bicolor. Seeds are black with a gray-yellow edge. 
Delphinium bicolor. Seed edges are covered with thick gelatinous material.  Delphinium bicolor. Seed edges are covered with thick gelatinous material. 
Delphinium bicolor
Delphinium bicolor. Seed edges are covered with thick gelatinous material. 
Delphinium elatum. Seeds with a reticulated surface that appears shiny and papery. Delphinium elatum. Seeds with a reticulated surface that appears shiny and papery.
Delphinium elatum
Delphinium elatum. Seeds with a reticulated surface that appears shiny and papery.
Delphinium elatum. Multiple views of the seed. Photo courtesy of USDA-APHIS-PPQ. Delphinium elatum. Multiple views of the seed. Photo courtesy of USDA-APHIS-PPQ.
Delphinium elatum
Delphinium elatum. Multiple views of the seed. Photo courtesy of USDA-APHIS-PPQ.

Delphinium glaucum . Seeds with transparent, irregular wings. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Delphinium glaucum. Seeds with transparent, irregular wings. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Delphinium glaucum
Delphinium glaucum. Seeds with transparent, irregular wings. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Dendrobium sp. Seeds inside a linear net. Dendrobium sp. Seeds inside a linear net.
Dendrobium sp.
Dendrobium sp. Seeds inside a linear net.
Dendrobium sp. Full seeds with appendages on both ends. Dendrobium sp. Full seeds with appendages on both ends.
Dendrobium sp.
Dendrobium sp. Full seeds with appendages on both ends.
Deschampsia cespitosa. Pubescent florets with dark brown caryopses. Deschampsia cespitosa. Pubescent florets with dark brown caryopses.
Deschampsia cespitosa
Deschampsia cespitosa. Pubescent florets with dark brown caryopses.