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Common name

Noxious Weed Seed

AOSA Examination List

Species Category

Disseminule/Planting Unit

Shape

Seed length

Seed width

Seed thickness

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From Left to Right: 1. Descurainia sophia 2. Descurainia pinnata 3. Capsella brusa-pastoris . Seeds do not have an indentation between the radicle and cotyledon lobes. From Left to Right: 1. Descurainia sophia 2. Descurainia pinnata 3. Capsella brusa-pastoris. Seeds do not have an indentation between the radicle and cotyledon lobes.
Descurainia pinnata
From Left to Right: 1. Descurainia sophia 2. Descurainia pinnata 3. Capsella brusa-pastoris. Seeds do not have an indentation between the radicle and cotyledon lobes.
Descurainia pinnata. Seeds with longitudinal rows of small tubercles.  Descurainia pinnata. Seeds with longitudinal rows of small tubercles. 
Descurainia pinnata
Descurainia pinnata. Seeds with longitudinal rows of small tubercles. 
From Left to Right: 1. Descurainia sophia 2. Descurainia pinnata 3. Capsella brusa-pastoris . Seeds with an indentation between the radicle and cotyledon lobes. From Left to Right: 1. Descurainia sophia 2. Descurainia pinnata 3. Capsella brusa-pastoris. Seeds with an indentation between the radicle and cotyledon lobes.
Descurainia sophia
From Left to Right: 1. Descurainia sophia 2. Descurainia pinnata 3. Capsella brusa-pastoris. Seeds with an indentation between the radicle and cotyledon lobes.
Descurainia sophia. Yellowish-brown seeds with a longitudinal groove between the lobes.  Descurainia sophia. Yellowish-brown seeds with a longitudinal groove between the lobes. 
Descurainia sophia
Descurainia sophia. Yellowish-brown seeds with a longitudinal groove between the lobes. 

Desmanthus illinoensis. Seeds are smooth with a conspicuous pleurogram line following the margin. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Desmanthus illinoensis. Seeds are smooth with a conspicuous pleurogram line following the margin. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Desmanthus illinoensis
Desmanthus illinoensis. Seeds are smooth with a conspicuous pleurogram line following the margin. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Desmodium tortuosum. Dark brown seeds with a black hilum ring. Desmodium tortuosum. Dark brown seeds with a black hilum ring.
Desmodium tortuosum
Desmodium tortuosum. Dark brown seeds with a black hilum ring.
Dianthus barbatus (large seeds);  Dianthus armeria (small seeds). Dianthus barbatus (large seeds); Dianthus armeria (small seeds).
Dianthus armeria
Dianthus barbatus (large seeds); Dianthus armeria (small seeds).
Dianthus barbatus (large seeds);  Dianthus armeria (small seeds). Dianthus barbatus (large seeds); Dianthus armeria (small seeds).
Dianthus barbatus
Dianthus barbatus (large seeds); Dianthus armeria (small seeds).

Dianthus barbatus.  Rough to tuberculate seeds. Dianthus barbatus. Rough to tuberculate seeds.
Dianthus barbatus
Dianthus barbatus. Rough to tuberculate seeds.
Dianthus caryophyllus. Seeds with a long hilum in the center of the ventral side. Dianthus caryophyllus. Seeds with a long hilum in the center of the ventral side.
Dianthus caryophyllus
Dianthus caryophyllus. Seeds with a long hilum in the center of the ventral side.
Dianthus deltoides. Seeds with a circular hilum in the center of the ventral side. Dianthus deltoides. Seeds with a circular hilum in the center of the ventral side.
Dianthus deltoides
Dianthus deltoides. Seeds with a circular hilum in the center of the ventral side.
Dianthus plumarius . Seeds with reticulations that radiate from the hilum on the ventral side and longitudinally on the dorsal side. Dianthus plumarius. Seeds with reticulations that radiate from the hilum on the ventral side and longitudinally on the dorsal side.
Dianthus plumarius
Dianthus plumarius. Seeds with reticulations that radiate from the hilum on the ventral side and longitudinally on the dorsal side.

Dicentra eximia. Black seeds with a caruncle-like structure that is often attached to the hilum. Dicentra eximia. Black seeds with a caruncle-like structure that is often attached to the hilum.
Dicentra eximia
Dicentra eximia. Black seeds with a caruncle-like structure that is often attached to the hilum.
Dichanthelium clandestinum. Florets are shiny with fine reticulations, with strongly ribbed glumes and sterile lemmas.  Dichanthelium clandestinum. Florets are shiny with fine reticulations, with strongly ribbed glumes and sterile lemmas. 
Dichanthelium clandestinum
Dichanthelium clandestinum. Florets are shiny with fine reticulations, with strongly ribbed glumes and sterile lemmas. 
Dichanthelium leibergii. Units are seen as a papery spikelet or a shiny floret. One of the papery spikelet covers is a sterile lemma, which is subtended by a small glume. Dichanthelium leibergii. Units are seen as a papery spikelet or a shiny floret. One of the papery spikelet covers is a sterile lemma, which is subtended by a small glume.
Dichanthelium leibergii
Dichanthelium leibergii. Units are seen as a papery spikelet or a shiny floret. One of the papery spikelet covers is a sterile lemma, which is subtended by a small glume.
Dichelostemma capitatum ssp. capitatum. True seeds with sharp ridges between irregular flat surface. Dichelostemma capitatum ssp. capitatum. True seeds with sharp ridges between irregular flat surface.
Dichelostemma capitatum subsp. capitatum
Dichelostemma capitatum ssp. capitatum. True seeds with sharp ridges between irregular flat surface.

Dichondra micrantha.  Seeds are brown and white mottled, with some roughness from the mottling. Dichondra micrantha. Seeds are brown and white mottled, with some roughness from the mottling.
Dichondra micrantha
Dichondra micrantha. Seeds are brown and white mottled, with some roughness from the mottling.
Dichrostachys cinerea. The flat surface of the seed has a pleurogram line that curves with the seed margin. The area within this pleurogram (known as the areola) is cracked on the surface. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Dichrostachys cinerea. The flat surface of the seed has a pleurogram line that curves with the seed margin. The area within this pleurogram (known as the areola) is cracked on the surface. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Dichrostachys cinerea
Dichrostachys cinerea. The flat surface of the seed has a pleurogram line that curves with the seed margin. The area within this pleurogram (known as the areola) is cracked on the surface. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Dieteria bigelovii.  Apex with expanded pappus crown. Dieteria bigelovii. Apex with expanded pappus crown.
Dieteria bigelovii
Dieteria bigelovii. Apex with expanded pappus crown.
Digitalis purpurea. Seeds with reticulations that give the surface a honeycomb effect. Digitalis purpurea. Seeds with reticulations that give the surface a honeycomb effect.
Digitalis purpurea
Digitalis purpurea. Seeds with reticulations that give the surface a honeycomb effect.

Digitaria abyssinica . Inflorescence. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria abyssinica. Inflorescence. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria abyssinica
Digitaria abyssinica. Inflorescence. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria abyssinica . The seeds are totally round with only a trace of cells forming a line half the way around the seed. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria abyssinica. The seeds are totally round with only a trace of cells forming a line half the way around the seed. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria abyssinica
Digitaria abyssinica. The seeds are totally round with only a trace of cells forming a line half the way around the seed. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria abyssinica . Florets with a sterile lemma and glumes that are papery and ribbed. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria abyssinica. Florets with a sterile lemma and glumes that are papery and ribbed. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria abyssinica
Digitaria abyssinica. Florets with a sterile lemma and glumes that are papery and ribbed. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria abyssinica . Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria abyssinica. Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria abyssinica
Digitaria abyssinica. Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ.

Digitaria horizontalis. Florets with most of the glume pubescence on the margin. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria horizontalis. Florets with most of the glume pubescence on the margin. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria horizontalis
Digitaria horizontalis. Florets with most of the glume pubescence on the margin. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria ischaemum. Florets with pubescent glumes, a fertile lemma, and longitudinal striations. Digitaria ischaemum. Florets with pubescent glumes, a fertile lemma, and longitudinal striations.
Digitaria ischaemum
Digitaria ischaemum. Florets with pubescent glumes, a fertile lemma, and longitudinal striations.
Digitaria ischaemum. Florets with pubescent glumes, a fertile lemma, and longitudinal striations. Digitaria ischaemum. Florets with pubescent glumes, a fertile lemma, and longitudinal striations.
Digitaria ischaemum
Digitaria ischaemum. Florets with pubescent glumes, a fertile lemma, and longitudinal striations.
Digitaria sanguinalis. Ribs and margins of the glumes are pubescent. The floret has fine striations.  Digitaria sanguinalis. Ribs and margins of the glumes are pubescent. The floret has fine striations. 
Digitaria sanguinalis
Digitaria sanguinalis. Ribs and margins of the glumes are pubescent. The floret has fine striations. 

Digitaria velutina. Florets with marginal ribs. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria velutina. Florets with marginal ribs. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina
Digitaria velutina. Florets with marginal ribs. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina. Florets with marginal ribs. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria velutina. Florets with marginal ribs. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina
Digitaria velutina. Florets with marginal ribs. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina. Florets are ribbed and have pubescence. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria velutina. Florets are ribbed and have pubescence. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina
Digitaria velutina. Florets are ribbed and have pubescence. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina. Florets with papery glumes. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria velutina. Florets with papery glumes. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina
Digitaria velutina. Florets with papery glumes. Photo by Julia Scher, USDA-APHIS-PPQ.

Digitaria velutina. Light brown florets and light brown glumes. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria velutina. Light brown florets and light brown glumes. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina
Digitaria velutina. Light brown florets and light brown glumes. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina.  Light brown florets and light brown glumes. Photo by Julia Scher, USDA-APHIS-PPQ. Digitaria velutina. Light brown florets and light brown glumes. Photo by Julia Scher, USDA-APHIS-PPQ.
Digitaria velutina
Digitaria velutina. Light brown florets and light brown glumes. Photo by Julia Scher, USDA-APHIS-PPQ.
Dimorphotheca tragus. Achenes with large wings with a marginal line. Dimorphotheca tragus. Achenes with large wings with a marginal line.
Dimorphotheca tragus
Dimorphotheca tragus. Achenes with large wings with a marginal line.
Dimorphotheca tragus. The seed is in a small spatulate structure in the center of the achene. Dimorphotheca tragus. The seed is in a small spatulate structure in the center of the achene.
Dimorphotheca tragus
Dimorphotheca tragus. The seed is in a small spatulate structure in the center of the achene.

Dimorphotheca tragus. Achenes. Dimorphotheca tragus. Achenes.
Dimorphotheca tragus
Dimorphotheca tragus. Achenes.
Diodia teres. Mericarps with a brown and hairy external side, with a flat, white internal side. Diodia teres. Mericarps with a brown and hairy external side, with a flat, white internal side.
Diodia teres
Diodia teres. Mericarps with a brown and hairy external side, with a flat, white internal side.
Diplacus longiflorus. Seeds with reticulation rows that are longitudinal and semi-transparent. Diplacus longiflorus. Seeds with reticulation rows that are longitudinal and semi-transparent.
Diplacus longiflorus
Diplacus longiflorus. Seeds with reticulation rows that are longitudinal and semi-transparent.
Distichlis spicata. Caryopses with elongated basal ends. Distichlis spicata. Caryopses with elongated basal ends.
Distichlis spicata
Distichlis spicata. Caryopses with elongated basal ends.