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Family

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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Abelmoschus esculentus.  Pointed extension from the hilum. Abelmoschus esculentus. Pointed extension from the hilum.
Abelmoschus esculentus
Abelmoschus esculentus. Pointed extension from the hilum.
Abelmoschus esculentus.  Hilar region. Photo courtesy of USDA-APHIS-PPQ. Abelmoschus esculentus. Hilar region. Photo courtesy of USDA-APHIS-PPQ.
Abelmoschus esculentus
Abelmoschus esculentus. Hilar region. Photo courtesy of USDA-APHIS-PPQ.
Abelmoschus esculentus. Photo by Norma Diaz, USDA-APHIS-PPQ. Abelmoschus esculentus. Photo by Norma Diaz, USDA-APHIS-PPQ.
Abelmoschus esculentus
Abelmoschus esculentus. Photo by Norma Diaz, USDA-APHIS-PPQ.
Abelmoschus esculentus.  Hilar region Slight compression on either side of the hilum. Photo courtesy of USDA-APHIS-PPQ. Abelmoschus esculentus. Hilar region Slight compression on either side of the hilum. Photo courtesy of USDA-APHIS-PPQ.
Abelmoschus esculentus
Abelmoschus esculentus. Hilar region Slight compression on either side of the hilum. Photo courtesy of USDA-APHIS-PPQ.

Abies concolor.  Winglike structure surrounding the true seed. Abies concolor. Winglike structure surrounding the true seed.
Abies concolor
Abies concolor. Winglike structure surrounding the true seed.
Abronia villosa. Achenes with long receptacles. Abronia villosa. Achenes with long receptacles.
Abronia villosa
Abronia villosa. Achenes with long receptacles.
From Left to Right: 1. Hibiscus trionum 2. Abutilon theophrasti.  From Left to Right: 1. Hibiscus trionum 2. Abutilon theophrasti. 
Abutilon theophrasti
From Left to Right: 1. Hibiscus trionum 2. Abutilon theophrasti. 
Abutilon theophrasti.  Seeds with a black, striate hilum. Abutilon theophrasti. Seeds with a black, striate hilum.
Abutilon theophrasti
Abutilon theophrasti. Seeds with a black, striate hilum.

Abutilon theophrasti.  Dissection, cross view of embryo. Photo courtesy of USDA-APHIS-PPQ. Abutilon theophrasti.  Dissection, cross view of embryo. Photo courtesy of USDA-APHIS-PPQ.
Abutilon theophrasti
Abutilon theophrasti.  Dissection, cross view of embryo. Photo courtesy of USDA-APHIS-PPQ.
Abutilon theophrasti.  Marginal view of a seed, showing hilar notch (left) and opposite side (right). Maximum seed thickness is 1.9 mm. Photo courtesy of USDA-APHIS-PPQ. Abutilon theophrasti.  Marginal view of a seed, showing hilar notch (left) and opposite side (right). Maximum seed thickness is 1.9 mm. Photo courtesy of USDA-APHIS-PPQ.
Abutilon theophrasti
Abutilon theophrasti.  Marginal view of a seed, showing hilar notch (left) and opposite side (right). Maximum seed thickness is 1.9 mm. Photo courtesy of USDA-APHIS-PPQ.
Acacia mearnsi.  Aril is attached to the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Acacia mearnsi. Aril is attached to the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Acacia mearnsii
Acacia mearnsi. Aril is attached to the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Acaena novae-zelandiae.  Achenes with spine pairs occasionally on the apex. Acaena novae-zelandiae. Achenes with spine pairs occasionally on the apex.
Acaena novae-zelandiae
Acaena novae-zelandiae. Achenes with spine pairs occasionally on the apex.

Acaena novae-zelandiae. Achenes with spine pairs occasionally on the apex. Acaena novae-zelandiae. Achenes with spine pairs occasionally on the apex.
Acaena novae-zelandiae
Acaena novae-zelandiae. Achenes with spine pairs occasionally on the apex.
Acalypha virginica.  Thin caruncle associated with hilum. Acalypha virginica. Thin caruncle associated with hilum.
Acalypha virginica
Acalypha virginica. Thin caruncle associated with hilum.
Acalypha virginica. Multiple views of seed. Photo courtesy of USDA-APHIS-PPQ. Acalypha virginica. Multiple views of seed. Photo courtesy of USDA-APHIS-PPQ.
Acalypha virginica
Acalypha virginica. Multiple views of seed. Photo courtesy of USDA-APHIS-PPQ.
Acamptopappus sphaerocephalus.  Pappus and fine pubescence. Acamptopappus sphaerocephalus. Pappus and fine pubescence.
Acamptopappus sphaerocephalus
Acamptopappus sphaerocephalus. Pappus and fine pubescence.

Acanthospermum hispidum . Achene with many short spines. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Acanthospermum hispidum. Achene with many short spines. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Acanthospermum hispidum
Acanthospermum hispidum. Achene with many short spines. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Acer rubrum . Samara. Acer rubrum. Samara.
Acer rubrum
Acer rubrum. Samara.
Achillea millefolium. Achenes are gray and black mottled.  Achillea millefolium. Achenes are gray and black mottled. 
Achillea millefolium
Achillea millefolium. Achenes are gray and black mottled. 
Achillea millefolium. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Achillea millefolium. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Achillea millefolium
Achillea millefolium. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Achillea millefolium.  Face view (top) and lateral view (bottom) of two fruits, showing the basal fruit attachment scar on the left and the stylar remains on the right.  Photo courtesy of USDA-APHIS-PPQ. Achillea millefolium. Face view (top) and lateral view (bottom) of two fruits, showing the basal fruit attachment scar on the left and the stylar remains on the right.  Photo courtesy of USDA-APHIS-PPQ.
Achillea millefolium
Achillea millefolium. Face view (top) and lateral view (bottom) of two fruits, showing the basal fruit attachment scar on the left and the stylar remains on the right.  Photo courtesy of USDA-APHIS-PPQ.
Achillea millefolium.  Apex of two fruits, showing stylar remnant and flanged collar. Photo courtesy of USDA-APHIS-PPQ. Achillea millefolium. Apex of two fruits, showing stylar remnant and flanged collar. Photo courtesy of USDA-APHIS-PPQ.
Achillea millefolium
Achillea millefolium. Apex of two fruits, showing stylar remnant and flanged collar. Photo courtesy of USDA-APHIS-PPQ.
Achnatherum hymenoides.  Silky pubescence, bottom right. Achnatherum hymenoides. Silky pubescence, bottom right.
Achnatherum hymenoides
Achnatherum hymenoides. Silky pubescence, bottom right.
Acmella oleracea. Seeds with white spines on margins. Acmella oleracea. Seeds with white spines on margins.
Acmella oleracea
Acmella oleracea. Seeds with white spines on margins.

Actaea racemosa.  D-shaped seeds. Actaea racemosa. D-shaped seeds.
Actaea racemosa
Actaea racemosa. D-shaped seeds.
Adenostoma fasciculatum.  Achene with small wings at the terminal end. Adenostoma fasciculatum. Achene with small wings at the terminal end.
Adenostoma fasciculatum
Adenostoma fasciculatum. Achene with small wings at the terminal end.
Aegilops cylindrica.  Cylindrical-shaped floret with spike segment. Aegilops cylindrica. Cylindrical-shaped floret with spike segment.
Aegilops cylindrica
Aegilops cylindrica. Cylindrical-shaped floret with spike segment.
Aegilops cylindrica.  Spike segment embedded in floret. Aegilops cylindrica. Spike segment embedded in floret.
Aegilops cylindrica
Aegilops cylindrica. Spike segment embedded in floret.

Aegilops geniculata.  Long awns on the rachis segment. Aegilops geniculata. Long awns on the rachis segment.
Aegilops geniculata
Aegilops geniculata. Long awns on the rachis segment.
Aegilops geniculata.  Lateral view of spikelet. Photo by Steve Hurst. USDA Natural Resources Conservation Service. Aegilops geniculata. Lateral view of spikelet. Photo by Steve Hurst. USDA Natural Resources Conservation Service.
Aegilops geniculata
Aegilops geniculata. Lateral view of spikelet. Photo by Steve Hurst. USDA Natural Resources Conservation Service.
Aegilops triuncialis.  Upper: Seed. Middle and Lower: rachis segment. Aegilops triuncialis. Upper: Seed. Middle and Lower: rachis segment.
Aegilops triuncialis
Aegilops triuncialis. Upper: Seed. Middle and Lower: rachis segment.
Aegilops triuncialis.  Long awns with spines. Aegilops triuncialis. Long awns with spines.
Aegilops triuncialis
Aegilops triuncialis. Long awns with spines.

Aegilops triuncialis . Lateral view of inflorescence / infructescence. Photo by Madeline Maher, USDA-APHIS-PPQ. Aegilops triuncialis. Lateral view of inflorescence / infructescence. Photo by Madeline Maher, USDA-APHIS-PPQ.
Aegilops triuncialis
Aegilops triuncialis. Lateral view of inflorescence / infructescence. Photo by Madeline Maher, USDA-APHIS-PPQ.
Aegilops triuncialis . Caryopsis, with embryo visible.  Photo by Madeline Maher, USDA-APHIS-PPQ. Aegilops triuncialis. Caryopsis, with embryo visible.  Photo by Madeline Maher, USDA-APHIS-PPQ.
Aegilops triuncialis
Aegilops triuncialis. Caryopsis, with embryo visible.  Photo by Madeline Maher, USDA-APHIS-PPQ.
Aeginetia indica.  True seeds. Photo by Julia Scher, USDA-APHIS-PPQ. Aeginetia indica. True seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Aeginetia indica
Aeginetia indica. True seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Aeginetia indica.  Coarsely reticulate texture. Photo by Julia Scher, USDA-APHIS-PPQ. Aeginetia indica. Coarsely reticulate texture. Photo by Julia Scher, USDA-APHIS-PPQ.
Aeginetia indica
Aeginetia indica. Coarsely reticulate texture. Photo by Julia Scher, USDA-APHIS-PPQ.

Aeginetia sp. True seeds. Photo by Julia Scher, USDA-APHIS-PPQ. Aeginetia sp. True seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Aeginetia indica
Aeginetia sp. True seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Aeginetia sp. Reticulate seeds. Photo by Julia Scher, USDA-APHIS-PPQ. Aeginetia sp. Reticulate seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Aeginetia indica
Aeginetia sp. Reticulate seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Aeschynomene indica.  Seed encased in fruit segment (left), reniform-shaped seed (right). Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Aeschynomene indica. Seed encased in fruit segment (left), reniform-shaped seed (right). Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Aeschynomene indica
Aeschynomene indica. Seed encased in fruit segment (left), reniform-shaped seed (right). Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Aeschynomene indica.  Reniform-shaped seed with a short divergent radicle lobe. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Aeschynomene indica. Reniform-shaped seed with a short divergent radicle lobe. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Aeschynomene indica
Aeschynomene indica. Reniform-shaped seed with a short divergent radicle lobe. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.