Gallery

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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Strombocarpa burkartii. Dark brown seeds with a rough surface. Photo by Julia Scher, USDA-APHIS-PPQ.

Strombocarpa burkartii
Strombocarpa burkartii. Dark brown seeds with a rough surface. Photo by Julia Scher, USDA-APHIS-PPQ.

Strombocarpa burkartii. Hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.

Strombocarpa burkartii
Strombocarpa burkartii. Hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.

Strombocarpa burkartii. Fruits. Photo by Julia Scher, USDA-APHIS-PPQ.

Strombocarpa burkartii
Strombocarpa burkartii. Fruits. Photo by Julia Scher, USDA-APHIS-PPQ.

Symphyotrichum laeve. Achenes with a deep constriction below the pappus crown at the apex.

Symphyotrichum laeve
Symphyotrichum laeve. Achenes with a deep constriction below the pappus crown at the apex.

Symphyotrichum novae-angliae. Achenes with an enlarged apical crown.

Symphyotrichum novae-angliae
Symphyotrichum novae-angliae. Achenes with an enlarged apical crown.

Symphyotrichum oolentangiense. Achenes with four to five white longitudinal ribs.

Symphyotrichum oolentangiense
Symphyotrichum oolentangiense. Achenes with four to five white longitudinal ribs.

Taeniatherum caput-medusae. Compact floret with a very long awn.

Taeniatherum caput-medusae
Taeniatherum caput-medusae. Compact floret with a very long awn.

Taeniatherum caput-medusae. Floret with a callus below the transverse groove.

Taeniatherum caput-medusae
Taeniatherum caput-medusae. Floret with a callus below the transverse groove.

Tagetes erecta. Achenes with two white distal ends.

Tagetes erecta
Tagetes erecta. Achenes with two white distal ends.

Tagetes sp. Achenes with two white distal ends.

Tagetes erecta
Tagetes sp. Achenes with two white distal ends.

Tagetes lucida. Achenes with short united scales with a few longer bristles for a pappus.

Tagetes lucida
Tagetes lucida. Achenes with short united scales with a few longer bristles for a pappus.

Tagetes minuta. Long and thin achenes with remnants of the pappus scales.

Tagetes minuta
Tagetes minuta. Long and thin achenes with remnants of the pappus scales.

Tagetes patula. Long united scales form the pappus.

Tagetes patula
Tagetes patula. Long united scales form the pappus.

Tagetes patula. Long united scales form the pappus.

Tagetes patula
Tagetes patula. Long united scales form the pappus.

Tamarix ramosissima. Achenes have pappus threads that may be three to four times longer than the achene, and are many in number.

Tamarix ramosissima
Tamarix ramosissima. Achenes have pappus threads that may be three to four times longer than the achene, and are many in number.

Tamarix ramosissima. Achenes with a pointed basal end.

Tamarix ramosissima
Tamarix ramosissima. Achenes with a pointed basal end.

Tanacetum parthenium. Achenes with large, closely spaced longitudinal ribs.

Tanacetum parthenium
Tanacetum parthenium. Achenes with large, closely spaced longitudinal ribs.

Tanacetum parthenium. Achenes with a pappus crown composed of scaly points, which are the terminal ends of the ribs.

Tanacetum parthenium
Tanacetum parthenium. Achenes with a pappus crown composed of scaly points, which are the terminal ends of the ribs.

Tanacetum vulgare. Achenes with an evident apical collar.

Tanacetum vulgare
Tanacetum vulgare. Achenes with an evident apical collar.

Taraxacum erythrospermum. Achenes with barbs on the longitudinal ribs that are increasingly larger from the base to the apex.

Taraxacum laevigatum
Taraxacum erythrospermum. Achenes with barbs on the longitudinal ribs that are increasingly larger from the base to the apex.

Taraxacum officinale. Achenes with a long beak, which is usually broken off, leaving a short, blunt remnant at the apex.

Taraxacum officinale
Taraxacum officinale. Achenes with a long beak, which is usually broken off, leaving a short, blunt remnant at the apex.

Tetragonia tetragonioides. A multigerm with four to five perianth bases on the apex.

Tetragonia tetragonioides
Tetragonia tetragonioides. A multigerm with four to five perianth bases on the apex.

Teucrium canadense. Irregularly shaped nutlets with a large, depressed scar that has a collar.

Teucrium canadense
Teucrium canadense. Irregularly shaped nutlets with a large, depressed scar that has a collar.

Thalictrum dasycarpum. Achenes with the distal ends that curve in the opposite direction in a distinct S-shape.

Thalictrum dasycarpum
Thalictrum dasycarpum. Achenes with the distal ends that curve in the opposite direction in a distinct S-shape.

Thelesperma filifolium. Achenes that may have one side free of warts and a pappus crown that has two sharp scales appearing as horns.

Thelesperma filifolium
Thelesperma filifolium. Achenes that may have one side free of warts and a pappus crown that has two sharp scales appearing as horns.

Themeda villosa. Florets with a sharp callus and a rachilla with sterile florets.

Themeda villosa
Themeda villosa. Florets with a sharp callus and a rachilla with sterile florets.

Thermopsis divaricarpa. True seeds with a large hilum with a surrounding collar, often with an adhering aril. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Thermopsis divaricarpa
Thermopsis divaricarpa. True seeds with a large hilum with a surrounding collar, often with an adhering aril. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Thermopsis divaricarpa. True seeds with a large hilum.

Thermopsis divaricarpa
Thermopsis divaricarpa. True seeds with a large hilum.

Thinopyrum intermedium. Florets with a V-shaped rachilla.

Thinopyrum intermedium
Thinopyrum intermedium. Florets with a V-shaped rachilla.

Thinopyrum ponticum. Florets with a short rachilla and thick apex.

Thinopyrum ponticum
Thinopyrum ponticum. Florets with a short rachilla and thick apex.

Thlaspi arvense. True seeds with four to five concentric ridges on each side.

Thlaspi arvense
Thlaspi arvense. True seeds with four to five concentric ridges on each side.

Thunbergia alata. True seeds with a large opening to the internal part of the seeds, which is the hilum.

Thunbergia alata
Thunbergia alata. True seeds with a large opening to the internal part of the seeds, which is the hilum.

Thymus praecox. Nutlets with surface roughness that may be from massive stipulation.

Thymus praecox
Thymus praecox. Nutlets with surface roughness that may be from massive stipulation.

Thymus vulgaris. Nutlets with a hilum that is a small oblique point at the seed's base.

Thymus vulgaris
Thymus vulgaris. Nutlets with a hilum that is a small oblique point at the seed's base.

Tibouchina sp. True seeds with an embryo that has an angular fold at the apex of the seed.

Tibouchina sp.
Tibouchina sp. True seeds with an embryo that has an angular fold at the apex of the seed.

Tithonia rotundifolia. Achenes, some with strong ribs.

Tithonia rotundifolia
Tithonia rotundifolia. Achenes, some with strong ribs.

Tordylium aegyptiacum

Zigadenus venosus var. venosus. True seeds that are light brown but contain some green.

Toxicoscordion venenosus
Zigadenus venosus var. venosus. True seeds that are light brown but contain some green.