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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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Tradescantia.  True seeds with a margin of large transverse wrinkles. Tradescantia. True seeds with a margin of large transverse wrinkles.
Tradescantia sp.
Tradescantia. True seeds with a margin of large transverse wrinkles.
Tragopogon porrifolius. Achenes with a long beak and longitudinal ribs. Tragopogon porrifolius. Achenes with a long beak and longitudinal ribs.
Tragopogon porrifolius
Tragopogon porrifolius. Achenes with a long beak and longitudinal ribs.
Tragopogon pratensis. Achenes with a long beak and longitudinal ribs and lateral scar. Tragopogon pratensis. Achenes with a long beak and longitudinal ribs and lateral scar.
Tragopogon pratensis
Tragopogon pratensis. Achenes with a long beak and longitudinal ribs and lateral scar.
Tribulus terrestris. Nutlets with large lateral horns. Tribulus terrestris. Nutlets with large lateral horns.
Tribulus terrestris
Tribulus terrestris. Nutlets with large lateral horns.

Tridax procumbens . Achenes with a dense pappus and the many pappus shafts are covered with lateral hairs. Tridax procumbens. Achenes with a dense pappus and the many pappus shafts are covered with lateral hairs.
Tridax procumbens
Tridax procumbens. Achenes with a dense pappus and the many pappus shafts are covered with lateral hairs.
Tridax procumbens . Achenes with a dense pappus and the many pappus shafts are covered with lateral hairs. Tridax procumbens. Achenes with a dense pappus and the many pappus shafts are covered with lateral hairs.
Tridax procumbens
Tridax procumbens. Achenes with a dense pappus and the many pappus shafts are covered with lateral hairs.
Tridax procumbens . Achenes and pappus thar are both hairy. Photo by Julia Scher, USDA-APHIS-PPQ. Tridax procumbens. Achenes and pappus thar are both hairy. Photo by Julia Scher, USDA-APHIS-PPQ.
Tridax procumbens
Tridax procumbens. Achenes and pappus thar are both hairy. Photo by Julia Scher, USDA-APHIS-PPQ.
Tridax procumbens . Achenes and pappus thar are both hairy. Photo by Julia Scher, USDA-APHIS-PPQ. Tridax procumbens. Achenes and pappus thar are both hairy. Photo by Julia Scher, USDA-APHIS-PPQ.
Tridax procumbens
Tridax procumbens. Achenes and pappus thar are both hairy. Photo by Julia Scher, USDA-APHIS-PPQ.

Tridax procumbens . Obovate achene with pappus shaft covered in hairs. Photo by Julia Scher, USDA-APHIS-PPQ. Tridax procumbens. Obovate achene with pappus shaft covered in hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Tridax procumbens
Tridax procumbens. Obovate achene with pappus shaft covered in hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Tridax procumbens . Obovate achene with pappus shaft covered in hairs. Photo by Julia Scher, USDA-APHIS-PPQ. Tridax procumbens. Obovate achene with pappus shaft covered in hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Tridax procumbens
Tridax procumbens. Obovate achene with pappus shaft covered in hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Tridens flavus. Florets with sturdy rachillas and calluses. Tridens flavus. Florets with sturdy rachillas and calluses.
Tridens flavus
Tridens flavus. Florets with sturdy rachillas and calluses.
Trifolium africanum. True seeds with the hilum located between the radicle and coleoptile lobes.  Trifolium africanum. True seeds with the hilum located between the radicle and coleoptile lobes. 
Trifolium africanum
Trifolium africanum. True seeds with the hilum located between the radicle and coleoptile lobes. 

Trifolium alexandrinum. True seeds with the radicle lobe about 2/3 the cotyledon length.  Trifolium alexandrinum. True seeds with the radicle lobe about 2/3 the cotyledon length. 
Trifolium alexandrinum
Trifolium alexandrinum. True seeds with the radicle lobe about 2/3 the cotyledon length. 
Trifolium alpestre . True seeds with a radicle lobe that is about two-thirds the cotyledon length. Trifolium alpestre. True seeds with a radicle lobe that is about two-thirds the cotyledon length.
Trifolium alpestre
Trifolium alpestre. True seeds with a radicle lobe that is about two-thirds the cotyledon length.
Trifolium ambiguum. True seeds with a light colored line on the side of the seed between the radicle and cotyledon lobes.  Trifolium ambiguum. True seeds with a light colored line on the side of the seed between the radicle and cotyledon lobes. 
Trifolium ambiguum
Trifolium ambiguum. True seeds with a light colored line on the side of the seed between the radicle and cotyledon lobes. 
Trifolium angulatum. True seeds with the hilum at one end of the oval, where the radicle and cotyledon lobes end.  Trifolium angulatum. True seeds with the hilum at one end of the oval, where the radicle and cotyledon lobes end. 
Trifolium angulatum
Trifolium angulatum. True seeds with the hilum at one end of the oval, where the radicle and cotyledon lobes end. 

Trifolium apertum. True seeds with a radicle lobe length that varies from 1/2 to the full length of the cotyledon lobe.  Trifolium apertum. True seeds with a radicle lobe length that varies from 1/2 to the full length of the cotyledon lobe. 
Trifolium apertum
Trifolium apertum. True seeds with a radicle lobe length that varies from 1/2 to the full length of the cotyledon lobe. 
Trifolium arvense. True seeds that have a surface that is covered with small, uniformly spaced dots.  Trifolium arvense. True seeds that have a surface that is covered with small, uniformly spaced dots. 
Trifolium arvense
Trifolium arvense. True seeds that have a surface that is covered with small, uniformly spaced dots. 
Trifolium campestre. True seeds that are narrow and oval, with a flat radicle tip. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Trifolium campestre. True seeds that are narrow and oval, with a flat radicle tip. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium campestre
Trifolium campestre. True seeds that are narrow and oval, with a flat radicle tip. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium depauperatum. True seeds with a rough surface with small dots. Trifolium depauperatum. True seeds with a rough surface with small dots.
Trifolium depauperatum
Trifolium depauperatum. True seeds with a rough surface with small dots.

Trifolium dubium. True seeds that are broadly oval, and the radicle lobe is slightly shorter than the cotyledon lobe. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Trifolium dubium. True seeds that are broadly oval, and the radicle lobe is slightly shorter than the cotyledon lobe. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium dubium
Trifolium dubium. True seeds that are broadly oval, and the radicle lobe is slightly shorter than the cotyledon lobe. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium fragiferum. True seeds with purple flecking that can vary from small specks to solid color.  Trifolium fragiferum. True seeds with purple flecking that can vary from small specks to solid color. 
Trifolium fragiferum
Trifolium fragiferum. True seeds with purple flecking that can vary from small specks to solid color. 
Trifolium fragiferum. True seeds that are  Trifolium fragiferum. True seeds that are "human" heart-shaped to oval-circular. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium fragiferum
Trifolium fragiferum. True seeds that are "human" heart-shaped to oval-circular. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium heldreichianum . True seeds with the hilum more exposed because the two lobes are more spread apart. Trifolium heldreichianum. True seeds with the hilum more exposed because the two lobes are more spread apart.
Trifolium heldreichianum
Trifolium heldreichianum. True seeds with the hilum more exposed because the two lobes are more spread apart.

Trifolium hirtum. True seeds with noticeable longitudinal wrinkling to the upper portion of the cotyledonary lobe. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Trifolium hirtum. True seeds with noticeable longitudinal wrinkling to the upper portion of the cotyledonary lobe. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium hirtum
Trifolium hirtum. True seeds with noticeable longitudinal wrinkling to the upper portion of the cotyledonary lobe. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium hybridum. True seeds with a yellow background and purple flecking, that are heart-shaped. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Trifolium hybridum. True seeds with a yellow background and purple flecking, that are heart-shaped. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium hybridum
Trifolium hybridum. True seeds with a yellow background and purple flecking, that are heart-shaped. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium incarnatum. True seeds with the radicle lobe compressed against the cotyledon.  Trifolium incarnatum. True seeds with the radicle lobe compressed against the cotyledon. 
Trifolium incarnatum
Trifolium incarnatum. True seeds with the radicle lobe compressed against the cotyledon. 
Trifolium incarnatum. True seeds with the hilum located half the distance of the cotyledon and isn't indented. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Trifolium incarnatum. True seeds with the hilum located half the distance of the cotyledon and isn't indented. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium incarnatum
Trifolium incarnatum. True seeds with the hilum located half the distance of the cotyledon and isn't indented. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Trifolium lupinaster. True seeds with a strong indentation on the side of the seed between the two lobes.  Trifolium lupinaster. True seeds with a strong indentation on the side of the seed between the two lobes. 
Trifolium lupinaster
Trifolium lupinaster. True seeds with a strong indentation on the side of the seed between the two lobes. 
Trifolium medium. True seeds with an indentation on the seed side between the two lobes, which may be associated with a lighter color.  Trifolium medium. True seeds with an indentation on the seed side between the two lobes, which may be associated with a lighter color. 
Trifolium medium
Trifolium medium. True seeds with an indentation on the seed side between the two lobes, which may be associated with a lighter color. 
Trifolium michelianum. True seeds with the area around the hilum light-colored.  Trifolium michelianum. True seeds with the area around the hilum light-colored. 
Trifolium michelianum
Trifolium michelianum. True seeds with the area around the hilum light-colored. 
Trifolium montanum. True seeds with a strong groove between the lobes. Trifolium montanum. True seeds with a strong groove between the lobes.
Trifolium montanum
Trifolium montanum. True seeds with a strong groove between the lobes.

Trifolium nigrescens.  True seeds with a small hump on the cotyledon side above the hilum. Trifolium nigrescens. True seeds with a small hump on the cotyledon side above the hilum.
Trifolium nigrescens
Trifolium nigrescens. True seeds with a small hump on the cotyledon side above the hilum.
Trifolium caucsicum . True seeds with the radicle lobe 3/4 the length of the cotyledon lobe.  Trifolium caucsicum. True seeds with the radicle lobe 3/4 the length of the cotyledon lobe. 
Trifolium ochroleucon subsp. ochroleucon
Trifolium caucsicum. True seeds with the radicle lobe 3/4 the length of the cotyledon lobe. 
Trifolium ochroleucum. True seeds with a line on the seed surface separating the radicle and cotyledon lobes. Trifolium ochroleucum. True seeds with a line on the seed surface separating the radicle and cotyledon lobes.
Trifolium ochroleucum
Trifolium ochroleucum. True seeds with a line on the seed surface separating the radicle and cotyledon lobes.
Trifolium ornithopodioides. True seeds with irregular shapes and colors. Trifolium ornithopodioides. True seeds with irregular shapes and colors.
Trifolium ornithopodioides
Trifolium ornithopodioides. True seeds with irregular shapes and colors.

Trifolium pallescens. True seeds with color varying from solid black to strong black mottling on a yellow background. Trifolium pallescens. True seeds with color varying from solid black to strong black mottling on a yellow background.
Trifolium pallescens
Trifolium pallescens. True seeds with color varying from solid black to strong black mottling on a yellow background.
Trifolium pannonicum. True seeds with the axis of the radicle and cotyledon lobes not parallel. Trifolium pannonicum. True seeds with the axis of the radicle and cotyledon lobes not parallel.
Trifolium pannonicum
Trifolium pannonicum. True seeds with the axis of the radicle and cotyledon lobes not parallel.
Trifolium patulum. True seeds with a strong groove on the seed side separating the radicle and cotyledon lobes. Trifolium patulum. True seeds with a strong groove on the seed side separating the radicle and cotyledon lobes.
Trifolium patulum
Trifolium patulum. True seeds with a strong groove on the seed side separating the radicle and cotyledon lobes.
Trifolium pratense. True seeds with purple shading. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Trifolium pratense. True seeds with purple shading. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium pratense
Trifolium pratense. True seeds with purple shading. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.