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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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Urtica dioic. Achenes that are often enclosed in sepals. Urtica dioic. Achenes that are often enclosed in sepals.
Urtica dioica
Urtica dioic. Achenes that are often enclosed in sepals.
Vaccaria hispanica. True seeds that are totally round with only a trace of cells forming a line half the way around the seed.  Vaccaria hispanica. True seeds that are totally round with only a trace of cells forming a line half the way around the seed. 
Vaccaria hispanica
Vaccaria hispanica. True seeds that are totally round with only a trace of cells forming a line half the way around the seed. 
Vaccaria hispanica. True seeds that are totally round with only a trace of cells forming a line half the way around the seed.  Vaccaria hispanica. True seeds that are totally round with only a trace of cells forming a line half the way around the seed. 
Vaccaria hispanica
Vaccaria hispanica. True seeds that are totally round with only a trace of cells forming a line half the way around the seed. 
Valeriana officinalis. Achenes with three longitudinal ribs on the dorsal side, whereas on the ventral side, there is only one. Valeriana officinalis. Achenes with three longitudinal ribs on the dorsal side, whereas on the ventral side, there is only one.
Valeriana officinalis
Valeriana officinalis. Achenes with three longitudinal ribs on the dorsal side, whereas on the ventral side, there is only one.

Ventenata dubia. Florets with glumes that have short bristles. Ventenata dubia. Florets with glumes that have short bristles.
Ventenata dubia
Ventenata dubia. Florets with glumes that have short bristles.
Verbascum thapsus. True seeds with the hilum on the narrowest end of the cylinder. Verbascum thapsus. True seeds with the hilum on the narrowest end of the cylinder.
Verbascum thapsus
Verbascum thapsus. True seeds with the hilum on the narrowest end of the cylinder.
Verbena bonariensis. Nutlets where the dorsal side has approximately three longitudinal ribs.  Verbena bonariensis. Nutlets where the dorsal side has approximately three longitudinal ribs. 
Verbena bonariensis
Verbena bonariensis. Nutlets where the dorsal side has approximately three longitudinal ribs. 
Verbena bonariensis. Nutlets where the dorsal side has approximately three longitudinal ribs.  Verbena bonariensis. Nutlets where the dorsal side has approximately three longitudinal ribs. 
Verbena bonariensis
Verbena bonariensis. Nutlets where the dorsal side has approximately three longitudinal ribs. 

Verbena hastata. Nutlets that are rounded on the exterior portion and flat on the two internal portions. Verbena hastata. Nutlets that are rounded on the exterior portion and flat on the two internal portions.
Verbena hastata
Verbena hastata. Nutlets that are rounded on the exterior portion and flat on the two internal portions.
From Left to Right: 1. Verbena stricta 2. Verbena hastata 3. Verbena urticifolia.    From Left to Right: 1. Verbena stricta 2. Verbena hastata 3. Verbena urticifolia.  
Verbena hastata
From Left to Right: 1. Verbena stricta 2. Verbena hastata 3. Verbena urticifolia.  
Verbena lasiostachys. Nutlets with two flat surfaces with a central ridge present on the ventral side. Verbena lasiostachys. Nutlets with two flat surfaces with a central ridge present on the ventral side.
Verbena lasiostachys
Verbena lasiostachys. Nutlets with two flat surfaces with a central ridge present on the ventral side.
Verbena. Nutlets with a coat that is flared at the apical end. Verbena. Nutlets with a coat that is flared at the apical end.
Verbena sp.
Verbena. Nutlets with a coat that is flared at the apical end.

From Left to Right: 1. Verbena stricta 2. Verbena hastata 3. Verbena urticifolia.    From Left to Right: 1. Verbena stricta 2. Verbena hastata 3. Verbena urticifolia.  
Verbena stricta
From Left to Right: 1. Verbena stricta 2. Verbena hastata 3. Verbena urticifolia.  
From Left to Right: 1. Verbena stricta 2. Verbena hastata 3. Verbena urticifolia.    From Left to Right: 1. Verbena stricta 2. Verbena hastata 3. Verbena urticifolia.  
Verbena urticifolia
From Left to Right: 1. Verbena stricta 2. Verbena hastata 3. Verbena urticifolia.  
Verbesina alternifolia. Achenes where the pappus crown has two opposing horn-like spikes. Verbesina alternifolia. Achenes where the pappus crown has two opposing horn-like spikes.
Verbesina alternifolia
Verbesina alternifolia. Achenes where the pappus crown has two opposing horn-like spikes.
Verbesina encelioides. Achenes are broad and have hairy marginal wings. Verbesina encelioides. Achenes are broad and have hairy marginal wings.
Verbesina encelioides
Verbesina encelioides. Achenes are broad and have hairy marginal wings.

Verbesina encelioides. Cypselae with partial head (top center. Achenes are broad and have hairy marginal wings. Photo Lindsey Seastone, USDA-APHIS-PPQ. Verbesina encelioides. Cypselae with partial head (top center. Achenes are broad and have hairy marginal wings. Photo Lindsey Seastone, USDA-APHIS-PPQ.
Verbesina encelioides
Verbesina encelioides. Cypselae with partial head (top center. Achenes are broad and have hairy marginal wings. Photo Lindsey Seastone, USDA-APHIS-PPQ.
Vernonia fasciculata. Achenes with the pappus crown slightly smaller than the achene circumference.  Vernonia fasciculata. Achenes with the pappus crown slightly smaller than the achene circumference. 
Vernonia fasciculata
Vernonia fasciculata. Achenes with the pappus crown slightly smaller than the achene circumference. 
Vernonia noveboracensis. Achenes with a pappus crown where the outer ring is made of short scales and the inner elements are long filamentous hairs.  Vernonia noveboracensis. Achenes with a pappus crown where the outer ring is made of short scales and the inner elements are long filamentous hairs. 
Vernonia noveboracensis
Vernonia noveboracensis. Achenes with a pappus crown where the outer ring is made of short scales and the inner elements are long filamentous hairs. 
Veronica anagallis-aquatica. True seeds with a somewhat irregular shape. Veronica anagallis-aquatica. True seeds with a somewhat irregular shape.
Veronica anagallis-aquatica
Veronica anagallis-aquatica. True seeds with a somewhat irregular shape.

Veronica arvensis. True seeds with an obovate hilum that lies on the flat side of the seed.  Veronica arvensis. True seeds with an obovate hilum that lies on the flat side of the seed. 
Veronica arvensis
Veronica arvensis. True seeds with an obovate hilum that lies on the flat side of the seed. 
Veronica spicata. True seeds with the hilum on the basal end connecting with a longitudinal groove on the ventral side of the seed.  Veronica spicata. True seeds with the hilum on the basal end connecting with a longitudinal groove on the ventral side of the seed. 
Veronica spicata
Veronica spicata. True seeds with the hilum on the basal end connecting with a longitudinal groove on the ventral side of the seed. 
Veronicastrum virginicum. True seeds with a large cavity on the ventral side. Veronicastrum virginicum. True seeds with a large cavity on the ventral side.
Veronicastrum virginicum
Veronicastrum virginicum. True seeds with a large cavity on the ventral side.
Vicia benghalensis. True seeds with the hilum flush with the seed surface. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Vicia benghalensis. True seeds with the hilum flush with the seed surface. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia benghalensis
Vicia benghalensis. True seeds with the hilum flush with the seed surface. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Vicia cracca. True seeds that are spherical with a conspicuous hilum.  Vicia cracca. True seeds that are spherical with a conspicuous hilum. 
Vicia cracca
Vicia cracca. True seeds that are spherical with a conspicuous hilum. 
Vicia faba. True seeds with a hilum that is usually black. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Vicia faba. True seeds with a hilum that is usually black. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia faba
Vicia faba. True seeds with a hilum that is usually black. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia grandiflora. True seeds with the hilum about 2/3 the circumference of the seed. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Vicia grandiflora. True seeds with the hilum about 2/3 the circumference of the seed. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia grandiflora
Vicia grandiflora. True seeds with the hilum about 2/3 the circumference of the seed. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia hirsuta. True seeds where the hilum often has a cover that is attached by one end of the seed to the end of the hilum. Vicia hirsuta. True seeds where the hilum often has a cover that is attached by one end of the seed to the end of the hilum.
Vicia hirsuta
Vicia hirsuta. True seeds where the hilum often has a cover that is attached by one end of the seed to the end of the hilum.

Vicia pannonica. True seeds with the hilum and chalaza on opposite sides of the seed. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Vicia pannonica. True seeds with the hilum and chalaza on opposite sides of the seed. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia pannonica
Vicia pannonica. True seeds with the hilum and chalaza on opposite sides of the seed. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia sativa. True seed with a slightly depressed hilum. Vicia sativa. True seed with a slightly depressed hilum.
Vicia sativa
Vicia sativa. True seed with a slightly depressed hilum.
Vicia sativa subsp. nigra. True seed with a wedge-shaped hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Vicia sativa subsp. nigra. True seed with a wedge-shaped hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia sativa subsp. nigra
Vicia sativa subsp. nigra. True seed with a wedge-shaped hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia tetrasperma. True seed with a longitudinal groove in the center of the hilum.  Vicia tetrasperma. True seed with a longitudinal groove in the center of the hilum. 
Vicia tetrasperma
Vicia tetrasperma. True seed with a longitudinal groove in the center of the hilum. 

Vicia villosa. True seeds that are mostly black, but may have some faint mottling. Vicia villosa. True seeds that are mostly black, but may have some faint mottling.
Vicia villosa
Vicia villosa. True seeds that are mostly black, but may have some faint mottling.
Vicia villosa subsp. varia. True seed with the chalaza near the end of the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Vicia villosa subsp. varia. True seed with the chalaza near the end of the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vicia villosa subsp. varia
Vicia villosa subsp. varia. True seed with the chalaza near the end of the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vigna radiata. True seed with the hilum covered with a whitish layer surrounded by a dark green band. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Vigna radiata. True seed with the hilum covered with a whitish layer surrounded by a dark green band. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vigna radiata
Vigna radiata. True seed with the hilum covered with a whitish layer surrounded by a dark green band. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vigna unguiculata. True seed with a depressed hilum that's obscured by whitish corky tissue. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Vigna unguiculata. True seed with a depressed hilum that's obscured by whitish corky tissue. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Vigna unguiculata
Vigna unguiculata. True seed with a depressed hilum that's obscured by whitish corky tissue. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Viguiera stenoloba . Achene with a square cross-section.  Viguiera stenoloba. Achene with a square cross-section. 
Viguiera stenoloba
Viguiera stenoloba. Achene with a square cross-section. 
Viola × wittrockiana.  True seed with a slightly oblique basal attachment. Viola × wittrockiana. True seed with a slightly oblique basal attachment.
Viola ×wittrockiana
Viola × wittrockiana. True seed with a slightly oblique basal attachment.
Viola × wittrockiana.  True seed with a slightly oblique basal attachment. Viola × wittrockiana. True seed with a slightly oblique basal attachment.
Viola ×wittrockiana
Viola × wittrockiana. True seed with a slightly oblique basal attachment.
Viola arvensis.  True seed with one longitudinal line from the base to the apex. Viola arvensis. True seed with one longitudinal line from the base to the apex.
Viola arvensis
Viola arvensis. True seed with one longitudinal line from the base to the apex.