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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Viola cornuta. Spikelet with a white and slightly oblique basal attachemnt.

Viola cornuta
Viola cornuta. Spikelet with a white and slightly oblique basal attachemnt.

Viola nuttallii. True seed with one longitudinal line from the base to the apex.

Viola nuttallii
Viola nuttallii. True seed with one longitudinal line from the base to the apex.

Vulpia microstachys. Floret with an indentation above the callus.

Vulpia microstachys
Vulpia microstachys. Floret with an indentation above the callus.

Vulpia microstachys. Floret with an indentation above the callus.

Vulpia microstachys
Vulpia microstachys. Floret with an indentation above the callus.

Vulpia microstachys. Linear hilum. Photo courtesy of USDA-APHIS-PPQ.

Vulpia microstachys
Vulpia microstachys. Linear hilum. Photo courtesy of USDA-APHIS-PPQ.

Vulpia myuros. Long and narrow floret with a long awn.

Vulpia myuros
Vulpia myuros. Long and narrow floret with a long awn.

Vulpia octoflora. Floret with a flat callus and a stout rachilla with a disced apex.

Vulpia octoflora
Vulpia octoflora. Floret with a flat callus and a stout rachilla with a disced apex.

Wyethia amplexicaulis. Achenes with short scales as the pappus, with an occasional pair of opposing bracts.

Wyethia amplexicaulis
Wyethia amplexicaulis. Achenes with short scales as the pappus, with an occasional pair of opposing bracts.

Xanthisma texanum. Achenes with long, triangular pappus scales.

Xanthisma texanum
Xanthisma texanum. Achenes with long, triangular pappus scales.

Xanthium spinosum. Burr that is a fused involucre which typically contains two achenes.

Xanthium spinosum
Xanthium spinosum. Burr that is a fused involucre which typically contains two achenes.

Xanthium spinosum. Burr. Note hairs on body. One beak is hidden by a couple of spines. Photo courtesy of USDA-APHIS-PPQ.

Xanthium spinosum
Xanthium spinosum. Burr. Note hairs on body. One beak is hidden by a couple of spines. Photo courtesy of USDA-APHIS-PPQ.

Xanthium strumarium. Burr with several involucre, hooked spines on the surface.

Xanthium strumarium
Xanthium strumarium. Burr with several involucre, hooked spines on the surface.

Xanthium strumarium. Burr with several involucre, hooked spines and a pair of beaks. Photo courtesy of USDA-APHIS-PPQ.

Xanthium strumarium
Xanthium strumarium. Burr with several involucre, hooked spines and a pair of beaks. Photo courtesy of USDA-APHIS-PPQ.

Xeranthemum annuum. Achenes with triangular pappus scales that are around half the length of the achene.

Xeranthemum annuum
Xeranthemum annuum. Achenes with triangular pappus scales that are around half the length of the achene.

Yucca sp. Wedge-shaped true seed.

Yucca sp.
Yucca sp. Wedge-shaped true seed.

Yucca sp. Longitudinal and cross section of fruit, showing mesocarp and seeds. Wedge-shaped true seed. Photo byNorma Diaz, USDA APHIS PPQ

Yucca sp.
Yucca sp. Longitudinal and cross section of fruit, showing mesocarp and seeds. Wedge-shaped true seed. Photo byNorma Diaz, USDA APHIS PPQ

Zea mays. Caryopsis with the embryo on the flat side of the base. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Zea mays
Zea mays. Caryopsis with the embryo on the flat side of the base. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Zea mexicana. Rachis segment that contains one floret.

Zea mexicana
Zea mexicana. Rachis segment that contains one floret.

Zinnia acerosa. Achenes with a pappus of flat blades or sharp awns.

Zinnia acerosa
Zinnia acerosa. Achenes with a pappus of flat blades or sharp awns.

Zinnia haageana. Achenes with a depressed pappus crown in the apex margin.

Zinnia haageana
Zinnia haageana. Achenes with a depressed pappus crown in the apex margin.

Zinnia haageana. Sharp awn is on only one side of the margin wing at the apex. Some achenes are pubescent, especially at their margins.

Zinnia haageana
Zinnia haageana. Sharp awn is on only one side of the margin wing at the apex. Some achenes are pubescent, especially at their margins.