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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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Euphorbia esula . Caruncle. Photo by Julia Scher, USDA-APHIS-PPQ. Euphorbia esula. Caruncle. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia esula
Euphorbia esula. Caruncle. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia esula . Seed capsules. Photo by Julia Scher, USDA-APHIS-PPQ. Euphorbia esula. Seed capsules. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia esula
Euphorbia esula. Seed capsules. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia esula . Cylindrical seeds are gray with brown flecks. Photo by Julia Scher, USDA-APHIS-PPQ. Euphorbia esula. Cylindrical seeds are gray with brown flecks. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia esula
Euphorbia esula. Cylindrical seeds are gray with brown flecks. Photo by Julia Scher, USDA-APHIS-PPQ.
From Left to Right: 1. Euphorbia marginata 2. Euphorbia davidii 3. Euphorbia esula.  Seeds are smooth to minutely reticulate. From Left to Right: 1. Euphorbia marginata 2. Euphorbia davidii 3. Euphorbia esula. Seeds are smooth to minutely reticulate.
Euphorbia esula
From Left to Right: 1. Euphorbia marginata 2. Euphorbia davidii 3. Euphorbia esula. Seeds are smooth to minutely reticulate.

Euphorbia heterophylla. Seeds with scattered tubercles. Euphorbia heterophylla. Seeds with scattered tubercles.
Euphorbia heterophylla
Euphorbia heterophylla. Seeds with scattered tubercles.
Euphorbia lucida. Seeds with an oblique hilum at the base that is sometimes covered with a caruncle. Photo by Julia Scher, USDA-APHIS-PPQ. Euphorbia lucida. Seeds with an oblique hilum at the base that is sometimes covered with a caruncle. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia lucida
Euphorbia lucida. Seeds with an oblique hilum at the base that is sometimes covered with a caruncle. Photo by Julia Scher, USDA-APHIS-PPQ.
From Left to Right: 1: Euphorbia marginata 2. Euphorbia davidii 3. Euphorbia esula . Seed surfaces are very rough with pointed elevations. From Left to Right: 1: Euphorbia marginata 2. Euphorbia davidii 3. Euphorbia esula. Seed surfaces are very rough with pointed elevations.
Euphorbia marginata
From Left to Right: 1: Euphorbia marginata 2. Euphorbia davidii 3. Euphorbia esula. Seed surfaces are very rough with pointed elevations.
Euphorbia marginata. Seeds are roughened by an irregular network of coarse lines.  Euphorbia marginata. Seeds are roughened by an irregular network of coarse lines. 
Euphorbia marginata
Euphorbia marginata. Seeds are roughened by an irregular network of coarse lines. 

Euphorbia myrsinites. Seeds with large ridges that are mostly longitudinally oriented, and a large caruncle.  Euphorbia myrsinites. Seeds with large ridges that are mostly longitudinally oriented, and a large caruncle. 
Euphorbia myrsinites
Euphorbia myrsinites. Seeds with large ridges that are mostly longitudinally oriented, and a large caruncle. 
Euphorbia oblongata. Black seeds with a white caruncle.  Euphorbia oblongata. Black seeds with a white caruncle. 
Euphorbia oblongata
Euphorbia oblongata. Black seeds with a white caruncle. 
Euphorbia serrata. Seeds with an oblique hilum and thin raphe.  Euphorbia serrata. Seeds with an oblique hilum and thin raphe. 
Euphorbia serrata
Euphorbia serrata. Seeds with an oblique hilum and thin raphe. 
Euphorbia terracina. Seeds with a hilum that is oblique with a suspended disc caruncle. Photo by Julia Scher, USDA-APHIS-PPQ. Euphorbia terracina. Seeds with a hilum that is oblique with a suspended disc caruncle. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia terracina
Euphorbia terracina. Seeds with a hilum that is oblique with a suspended disc caruncle. Photo by Julia Scher, USDA-APHIS-PPQ.

Euphorbia terracina. Seeds with a deep circle on the apex and a thin raphe. Photo by Julia Scher, USDA-APHIS-PPQ. Euphorbia terracina. Seeds with a deep circle on the apex and a thin raphe. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia terracina
Euphorbia terracina. Seeds with a deep circle on the apex and a thin raphe. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia terracina. Seed capsule. Photo by Julia Scher, USDA-APHIS-PPQ. Euphorbia terracina. Seed capsule. Photo by Julia Scher, USDA-APHIS-PPQ.
Euphorbia terracina
Euphorbia terracina. Seed capsule. Photo by Julia Scher, USDA-APHIS-PPQ.
Eustachys distichophylla. Lemma has a strong central rib, and the margin has long hairs. Eustachys distichophylla. Lemma has a strong central rib, and the margin has long hairs.
Eustachys distichophylla
Eustachys distichophylla. Lemma has a strong central rib, and the margin has long hairs.
Eustoma exaltatum ssp. russellianum. Seeds are shiny between rough reticulations. Eustoma exaltatum ssp. russellianum. Seeds are shiny between rough reticulations.
Eustoma exaltatum subsp. russellianum
Eustoma exaltatum ssp. russellianum. Seeds are shiny between rough reticulations.

Euthamia occidentalis. Achenes with a finely barbed pappus. Euthamia occidentalis. Achenes with a finely barbed pappus.
Euthamia occidentalis
Euthamia occidentalis. Achenes with a finely barbed pappus.
Eutrochium maculatum. Seeds are black with a white pappus crown. Eutrochium maculatum. Seeds are black with a white pappus crown.
Eutrochium maculatum
Eutrochium maculatum. Seeds are black with a white pappus crown.
Eutrochium maculatum. Seeds are black with a white pappus crown; pappus is sometimes present. Eutrochium maculatum. Seeds are black with a white pappus crown; pappus is sometimes present.
Eutrochium maculatum
Eutrochium maculatum. Seeds are black with a white pappus crown; pappus is sometimes present.
Eutrochium purpureum. White achenes with a slight indentation below the pappus crown. Eutrochium purpureum. White achenes with a slight indentation below the pappus crown.
Eutrochium purpureum
Eutrochium purpureum. White achenes with a slight indentation below the pappus crown.

Fagopyrum esculentum . Achenes are light brown with dark, lateral, feather-like streaking. Fagopyrum esculentum. Achenes are light brown with dark, lateral, feather-like streaking.
Fagopyrum esculentum
Fagopyrum esculentum. Achenes are light brown with dark, lateral, feather-like streaking.
Fagopyrum esculentum . Basal view of fruit. Achene with part of calyx remaining. Photo by Ana Margina, Ana, USDA-APHIS-PPQ. Fagopyrum esculentum. Basal view of fruit. Achene with part of calyx remaining. Photo by Ana Margina, Ana, USDA-APHIS-PPQ.
Fagopyrum esculentum
Fagopyrum esculentum. Basal view of fruit. Achene with part of calyx remaining. Photo by Ana Margina, Ana, USDA-APHIS-PPQ.
Fallugia paradoxa. Achenes with a long awn. Fallugia paradoxa. Achenes with a long awn.
Fallugia paradoxa
Fallugia paradoxa. Achenes with a long awn.
Festuca filiformis. Florets are dark from the caryopsis color. Festuca filiformis. Florets are dark from the caryopsis color.
Festuca filiformis
Festuca filiformis. Florets are dark from the caryopsis color.

Festuca idahoensis. The rachilla is covered with short hairs, and the florets may have a short awn. Festuca idahoensis. The rachilla is covered with short hairs, and the florets may have a short awn.
Festuca idahoensis
Festuca idahoensis. The rachilla is covered with short hairs, and the florets may have a short awn.
Festuca idahoensis. The rachilla is covered with short hairs. Festuca idahoensis. The rachilla is covered with short hairs.
Festuca idahoensis
Festuca idahoensis. The rachilla is covered with short hairs.
Festuca ovina. Florets are sparsely pubescent across the top and glabrous below. Caryopsis is also pictured.  Festuca ovina. Florets are sparsely pubescent across the top and glabrous below. Caryopsis is also pictured. 
Festuca ovina
Festuca ovina. Florets are sparsely pubescent across the top and glabrous below. Caryopsis is also pictured. 
Festuca rubra. Linear florets with the rachilla pressed outward. Brown caryopsis is also pictured. Festuca rubra. Linear florets with the rachilla pressed outward. Brown caryopsis is also pictured.
Festuca rubra
Festuca rubra. Linear florets with the rachilla pressed outward. Brown caryopsis is also pictured.

Festuca rubra. Ventral / adaxial view of floret. Photo by Mark S. Towata, USDA-APHIS-PPQ. Festuca rubra. Ventral / adaxial view of floret. Photo by Mark S. Towata, USDA-APHIS-PPQ.
Festuca rubra
Festuca rubra. Ventral / adaxial view of floret. Photo by Mark S. Towata, USDA-APHIS-PPQ.
Festuca rubra ssp . fallax. Florets with a brown caryopsis and a compressed rachilla. Festuca rubra ssp. fallax. Florets with a brown caryopsis and a compressed rachilla.
Festuca rubra subsp. fallax
Festuca rubra ssp. fallax. Florets with a brown caryopsis and a compressed rachilla.
Festuca subverticillata. Florets are light brown with the dark color of the caryopsis showing through.  Festuca subverticillata. Florets are light brown with the dark color of the caryopsis showing through. 
Festuca subverticillata
Festuca subverticillata. Florets are light brown with the dark color of the caryopsis showing through. 
Festuca thurberi. Florets with a longitudinal groove in the center of the palea. Caryopsis is also pictured. Festuca thurberi. Florets with a longitudinal groove in the center of the palea. Caryopsis is also pictured.
Festuca thurberi
Festuca thurberi. Florets with a longitudinal groove in the center of the palea. Caryopsis is also pictured.

Festuca thurberi. Florets with an indentation above the callus. Festuca thurberi. Florets with an indentation above the callus.
Festuca thurberi
Festuca thurberi. Florets with an indentation above the callus.
Festuca trachyphylla. Florets are small and broad in the middle and quickly compress toward the apex. Caryopsis is also pictured.  Festuca trachyphylla. Florets are small and broad in the middle and quickly compress toward the apex. Caryopsis is also pictured. 
Festuca trachyphylla
Festuca trachyphylla. Florets are small and broad in the middle and quickly compress toward the apex. Caryopsis is also pictured. 
Fimbristylis autumnalis. Achenes with a strong style with lateral lumps, three longitudinal ridges, and a basal scar.  Fimbristylis autumnalis. Achenes with a strong style with lateral lumps, three longitudinal ridges, and a basal scar. 
Fimbristylis autumnalis
Fimbristylis autumnalis. Achenes with a strong style with lateral lumps, three longitudinal ridges, and a basal scar. 
Foeniculum vulgare. Mericarps with a dark color between ribs and on the flat surface. Foeniculum vulgare. Mericarps with a dark color between ribs and on the flat surface.
Foeniculum vulgare
Foeniculum vulgare. Mericarps with a dark color between ribs and on the flat surface.

Fragaria sp. Achenes with a marginal rib that follows the entire circumference of the seed. Fragaria sp. Achenes with a marginal rib that follows the entire circumference of the seed.
Fragaria sp.
Fragaria sp. Achenes with a marginal rib that follows the entire circumference of the seed.
Frasera speciosa.  True seeds, laterally compressed and slightly winged at the margin. Frasera speciosa. True seeds, laterally compressed and slightly winged at the margin.
Frasera speciosa
Frasera speciosa. True seeds, laterally compressed and slightly winged at the margin.
Fremontodendron decumbens. Seeds with the hilum at the base that have the lower attachment to the radicle cover.  Fremontodendron decumbens. Seeds with the hilum at the base that have the lower attachment to the radicle cover. 
Fremontodendron decumbens
Fremontodendron decumbens. Seeds with the hilum at the base that have the lower attachment to the radicle cover. 
Gaillardia aristata. Achenes with hairs of a length equal to the achene covering the surface. Gaillardia aristata. Achenes with hairs of a length equal to the achene covering the surface.
Gaillardia aristata
Gaillardia aristata. Achenes with hairs of a length equal to the achene covering the surface.