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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Trifolium repens. True seeds with the radicle lobe approximately the same length as the cotyledon lobe and diverging, leaving a depression for the hilum.

Trifolium repens
Trifolium repens. True seeds with the radicle lobe approximately the same length as the cotyledon lobe and diverging, leaving a depression for the hilum.

Trifolium repens. True seeds with no flecking. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Trifolium repens
Trifolium repens. True seeds with no flecking. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Trifolium rubens. True seeds that have a weak groove on the seed side between the radicle and cotyledon lobes.

Trifolium rubens
Trifolium rubens. True seeds that have a weak groove on the seed side between the radicle and cotyledon lobes.

Trifolium semipilosum. True seeds that are sometimes sandy on the surface.

Trifolium semipilosum
Trifolium semipilosum. True seeds that are sometimes sandy on the surface.

Trifolium subterraneum. True seeds with a radicle 3/4 the length of the cotyledon lobe and is divergent. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Trifolium subterraneum
Trifolium subterraneum. True seeds with a radicle 3/4 the length of the cotyledon lobe and is divergent. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Trifolium trichocephalum. True seeds with a surface grooves between lobes and are almost oval-shaped.

Trifolium trichocephalum
Trifolium trichocephalum. True seeds with a surface grooves between lobes and are almost oval-shaped.

Trifolium tumens. True seeds with light coloring between the lobes.

Trifolium tumens
Trifolium tumens. True seeds with light coloring between the lobes.

Trifolium velebiticum. True seeds with a surface groove between the seed lobes.

Trifolium velebiticum
Trifolium velebiticum. True seeds with a surface groove between the seed lobes.

Trifolium vesiculosum. True seeds where the radicle lobe is divergent and the hilum lies in the indentation between lobes. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Trifolium vesiculosum
Trifolium vesiculosum. True seeds where the radicle lobe is divergent and the hilum lies in the indentation between lobes. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Trifolium willdenovii. True seeds with the radicle and cotyledon lobes of usually the same length.

Trifolium willdenovii
Trifolium willdenovii. True seeds with the radicle and cotyledon lobes of usually the same length.

Triglochin maritima. Carpels contain one seed.

Triglochin maritima
Triglochin maritima. Carpels contain one seed.

Triglochin maritima. Carpel that is enclosed in a fruit segment.

Triglochin maritima
Triglochin maritima. Carpel that is enclosed in a fruit segment.

Trigonella foenum-graecum. True seed with the hilum located in a depression between the ends of the lobes.

Trigonella foenum-graecum
Trigonella foenum-graecum. True seed with the hilum located in a depression between the ends of the lobes.

Trigonella stellata. True seeds with the axis of the radicle and cotyledon lobes parallel.

Trigonella stellata
Trigonella stellata. True seeds with the axis of the radicle and cotyledon lobes parallel.

Tripleurospermum performatum. Achenes with very strong longitudinal ribs, a blunt base and apex, and a collar.

Tripleurospermum perforatum
Tripleurospermum performatum. Achenes with very strong longitudinal ribs, a blunt base and apex, and a collar.

Tripsacum dactyloides. Rachis segment that contains one floret that is not visible.

Tripsacum dactyloides
Tripsacum dactyloides. Rachis segment that contains one floret that is not visible.

Tripsacum dactyloides. Lateral view of spikelet. Photo by Steve Hurst, USDA-NRCS

Tripsacum dactyloides
Tripsacum dactyloides. Lateral view of spikelet. Photo by Steve Hurst, USDA-NRCS

Triticum aestivum subsp. aestivum. Caryopsis with an embryo with a rounded apex and deep groove on ventral side.

Triticum aestivum
Triticum aestivum subsp. aestivum. Caryopsis with an embryo with a rounded apex and deep groove on ventral side.

Triticum durum. Caryopsis is hard and semi-translucent, and its ventral crease is wide, V-shaped.

Triticum durum
Triticum durum. Caryopsis is hard and semi-translucent, and its ventral crease is wide, V-shaped.

Triticum monococcum subsp. monococcum. Caryopsis with a pointed embryo.

Triticum monococcum subsp. monococcum
Triticum monococcum subsp. monococcum. Caryopsis with a pointed embryo.

Triticum polonicum. Caryopsis with a ridge on the dorsal side and the ventral side is bowed inward.

Triticum polonicum
Triticum polonicum. Caryopsis with a ridge on the dorsal side and the ventral side is bowed inward.

Triticum aestivum subsp. spelta. Spikelet with multiple florets and short glumes.

Triticum spelta
Triticum aestivum subsp. spelta. Spikelet with multiple florets and short glumes.

Triticum turgidum. Spikelet that usually contains two florets.

Triticum turgidum
Triticum turgidum. Spikelet that usually contains two florets.

Triumfetta rhomboidea. Burrs with short, stiff, hairs and hooked spines.

Triumfetta rhomboidea
Triumfetta rhomboidea. Burrs with short, stiff, hairs and hooked spines.

Triumfetta semitriloba. Burrs with prominent, stiff, hooked spines.

Triumfetta semitriloba
Triumfetta semitriloba. Burrs with prominent, stiff, hooked spines.

Tropaeolum majus. Mericarps with longitudinal grooves on the curved side.

Tropaeolum majus
Tropaeolum majus. Mericarps with longitudinal grooves on the curved side.

Ulex europaeus. True seeds with the hilum area between the lobes and covered with a large corky caruncle (aril), and can appear wing-like at times. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Ulex europaeus
Ulex europaeus. True seeds with the hilum area between the lobes and covered with a large corky caruncle (aril), and can appear wing-like at times. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Urena lobata. True seed with a carpel wall that has long spines.

Urena lobata
Urena lobata. True seed with a carpel wall that has long spines.

Urochloa panicoides. The unit is found in spikelet and floret form. Photo by Julia Scher, USDA-APHIS-PPQ.

Urochloa panicoides
Urochloa panicoides. The unit is found in spikelet and floret form. Photo by Julia Scher, USDA-APHIS-PPQ.

Urochloa panicoides. Spikelet with a caryopsis that is slightly translucent. Photo by Julia Scher, USDA-APHIS-PPQ.

Urochloa panicoides
Urochloa panicoides. Spikelet with a caryopsis that is slightly translucent. Photo by Julia Scher, USDA-APHIS-PPQ.

Urochloa panicoides. Spikelet with a caryopsis that is slightly translucent. Photo by Julia Scher, USDA-APHIS-PPQ.

Urochloa panicoides
Urochloa panicoides. Spikelet with a caryopsis that is slightly translucent. Photo by Julia Scher, USDA-APHIS-PPQ.

Urochloa platyphylla. Florets with a palea that is transversely rough between its margin ridges and shiny smooth outside the ridges.

Urochloa platyphylla
Urochloa platyphylla. Florets with a palea that is transversely rough between its margin ridges and shiny smooth outside the ridges.

Urochloa ramosa. Spikelet with five longitudinal nerves on the second glume.

Urochloa ramosa
Urochloa ramosa. Spikelet with five longitudinal nerves on the second glume.

Urochloa ramosa. Spikelets with coverings that are papery, short, and long glumes and a sterile lemma. Photo by Julia Scher, USDA-APHIS-PPQ.

Urochloa ramosa
Urochloa ramosa. Spikelets with coverings that are papery, short, and long glumes and a sterile lemma. Photo by Julia Scher, USDA-APHIS-PPQ.

Urochloa ramosa. Spikelet with five longitudinal nerves on the second glume.

Urochloa ramosa
Urochloa ramosa. Spikelet with five longitudinal nerves on the second glume.

Urochloa texana. Spikelet with glumes and sterile lemma that are smooth and papery.

Urochloa texana
Urochloa texana. Spikelet with glumes and sterile lemma that are smooth and papery.

Urochloa texana. Spikelet with glumes that have strong longitudinal nerves.

Urochloa texana
Urochloa texana. Spikelet with glumes that have strong longitudinal nerves.

Urochloa texana. Spikelet where the palea is transversely rough between its margin ridges and shiny smooth outside the ridges. Photo by Julia Scher, USDA-APHIS-PPQ.

Urochloa texana
Urochloa texana. Spikelet where the palea is transversely rough between its margin ridges and shiny smooth outside the ridges. Photo by Julia Scher, USDA-APHIS-PPQ.