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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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Hygrophila polysperma. Seeds with a finely stippled surface texture. Photo by Julia Scher, USDA-APHIS-PPQ. Hygrophila polysperma. Seeds with a finely stippled surface texture. Photo by Julia Scher, USDA-APHIS-PPQ.
Hygrophila polysperma
Hygrophila polysperma. Seeds with a finely stippled surface texture. Photo by Julia Scher, USDA-APHIS-PPQ.
Hygrophila polysperma. Seeds with an oval hilum on the margin. Photo by Julia Scher, USDA-APHIS-PPQ. Hygrophila polysperma. Seeds with an oval hilum on the margin. Photo by Julia Scher, USDA-APHIS-PPQ.
Hygrophila polysperma
Hygrophila polysperma. Seeds with an oval hilum on the margin. Photo by Julia Scher, USDA-APHIS-PPQ.
Hymenoxys hoopesii. Achenes with some moderate and longitudinal wrinkles. Hymenoxys hoopesii. Achenes with some moderate and longitudinal wrinkles.
Hymenoxys hoopesii
Hymenoxys hoopesii. Achenes with some moderate and longitudinal wrinkles.
Hyoscyamus niger. Seeds with strong reticulations with stipples at their bases. Hyoscyamus niger. Seeds with strong reticulations with stipples at their bases.
Hyoscyamus niger
Hyoscyamus niger. Seeds with strong reticulations with stipples at their bases.

Hyoscyamus niger. D-shaped seeds with a slightly raised hilum on the margin. Hyoscyamus niger. D-shaped seeds with a slightly raised hilum on the margin.
Hyoscyamus niger
Hyoscyamus niger. D-shaped seeds with a slightly raised hilum on the margin.
Hypericum perforatum. Small, cylindrical, and reticulate seeds. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Hypericum perforatum. Small, cylindrical, and reticulate seeds. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Hypericum perforatum
Hypericum perforatum. Small, cylindrical, and reticulate seeds. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Hypericum perforatum. Highly reticulated and shiny seeds with rounded ends. Hypericum perforatum. Highly reticulated and shiny seeds with rounded ends.
Hypericum perforatum
Hypericum perforatum. Highly reticulated and shiny seeds with rounded ends.
Hypochaeris radicata. Achenes with a long, narrow apical beak ending with a pappus collar.  Hypochaeris radicata. Achenes with a long, narrow apical beak ending with a pappus collar. 
Hypochaeris radicata
Hypochaeris radicata. Achenes with a long, narrow apical beak ending with a pappus collar. 

Hypoestes phyllostachya. Glandular seeds with a radicle lobe that protrudes outside the oval margin.  Hypoestes phyllostachya. Glandular seeds with a radicle lobe that protrudes outside the oval margin. 
Hypoestes phyllostachya
Hypoestes phyllostachya. Glandular seeds with a radicle lobe that protrudes outside the oval margin. 
Hyptis pectinata. Nutlets with a white, longitudinally elongated scar. The capsule is also pictured above. Hyptis pectinata. Nutlets with a white, longitudinally elongated scar. The capsule is also pictured above.
Hyptis pectinata
Hyptis pectinata. Nutlets with a white, longitudinally elongated scar. The capsule is also pictured above.
Hyptis suaveolens.  Nutlets with a large, longitudinal ridge that extends the entire length of the nutlet and splits the scar on the basal end of the ventral side. Hyptis suaveolens. Nutlets with a large, longitudinal ridge that extends the entire length of the nutlet and splits the scar on the basal end of the ventral side.
Hyptis suaveolens
Hyptis suaveolens. Nutlets with a large, longitudinal ridge that extends the entire length of the nutlet and splits the scar on the basal end of the ventral side.
Hyssopus officinalis. Nutlets with a white, heart-shaped hilum at the lateral side of the base. Hyssopus officinalis. Nutlets with a white, heart-shaped hilum at the lateral side of the base.
Hyssopus officinalis
Hyssopus officinalis. Nutlets with a white, heart-shaped hilum at the lateral side of the base.

Iberis sempervirens. Seeds with a strong longitudinal ridge near the margin of the cotyledon lobe. Iberis sempervirens. Seeds with a strong longitudinal ridge near the margin of the cotyledon lobe.
Iberis sempervirens
Iberis sempervirens. Seeds with a strong longitudinal ridge near the margin of the cotyledon lobe.
Iberis umbellata. Wrinkled seeds with a curved groove separating the radicle and cotyledon lobes.  Iberis umbellata. Wrinkled seeds with a curved groove separating the radicle and cotyledon lobes. 
Iberis umbellata
Iberis umbellata. Wrinkled seeds with a curved groove separating the radicle and cotyledon lobes. 
Impatiens balsamina. Seeds with small wrinkles and large tubercles. Impatiens balsamina. Seeds with small wrinkles and large tubercles.
Impatiens balsamina
Impatiens balsamina. Seeds with small wrinkles and large tubercles.
Impatiens walleriana. Seeds with small wrinkles, large tubercles, and a curved, narrow radicle end.  Impatiens walleriana. Seeds with small wrinkles, large tubercles, and a curved, narrow radicle end. 
Impatiens walleriana
Impatiens walleriana. Seeds with small wrinkles, large tubercles, and a curved, narrow radicle end. 

Imperata brasiliensis. Florets with transparent apical ends. Photo by Julia Scher, USDA-APHIS-PPQ. Imperata brasiliensis. Florets with transparent apical ends. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata brasiliensis
Imperata brasiliensis. Florets with transparent apical ends. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata brasiliensis. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Imperata brasiliensis. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata brasiliensis
Imperata brasiliensis. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata brasiliensis. Caryopses are obovate, brown, and about 1 mm long. Photo by Julia Scher, USDA-APHIS-PPQ. Imperata brasiliensis. Caryopses are obovate, brown, and about 1 mm long. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata brasiliensis
Imperata brasiliensis. Caryopses are obovate, brown, and about 1 mm long. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata brasiliensis. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Imperata brasiliensis. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata brasiliensis
Imperata brasiliensis. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ.

Imperata brasiliensis. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Imperata brasiliensis. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata brasiliensis
Imperata brasiliensis. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata cylindrica . Florets with many long, silky hairs coming from the callus.  Imperata cylindrica. Florets with many long, silky hairs coming from the callus. 
Imperata cylindrica
Imperata cylindrica. Florets with many long, silky hairs coming from the callus. 
Imperata cylindrica. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Imperata cylindrica. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata cylindrica
Imperata cylindrica. Florets with many long, silky hairs coming from the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata cylindrica. Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ. Imperata cylindrica. Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata cylindrica
Imperata cylindrica. Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.

Imperata cylindrica. Hairy florets. Photo by Julia Scher, USDA-APHIS-PPQ. Imperata cylindrica. Hairy florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Imperata cylindrica
Imperata cylindrica. Hairy florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Indigofera hirsuta. Shiny seed with undulated with small depressions. Indigofera hirsuta. Shiny seed with undulated with small depressions.
Indigofera hirsuta
Indigofera hirsuta. Shiny seed with undulated with small depressions.
Indigofera hirsuta. Seed is covered with uniformly spaced indentations. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Indigofera hirsuta. Seed is covered with uniformly spaced indentations. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Indigofera hirsuta
Indigofera hirsuta. Seed is covered with uniformly spaced indentations. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Inula helenium. Achenes with a basal attachment that is wide and often laterally bent. Inula helenium. Achenes with a basal attachment that is wide and often laterally bent.
Inula helenium
Inula helenium. Achenes with a basal attachment that is wide and often laterally bent.

Ipomoea alba. Seeds with a large circular hilum. Ipomoea alba. Seeds with a large circular hilum.
Ipomoea alba
Ipomoea alba. Seeds with a large circular hilum.
Ipomoea alba. Very large seeds with two flat sides that are slightly indented. Ipomoea alba. Very large seeds with two flat sides that are slightly indented.
Ipomoea alba
Ipomoea alba. Very large seeds with two flat sides that are slightly indented.
Ipomoea aquatica. Seeds with a round, indented hilum with dense hairs. Photo by Julia Scher, USDA-APHIS-PPQ. Ipomoea aquatica. Seeds with a round, indented hilum with dense hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Ipomoea aquatica
Ipomoea aquatica. Seeds with a round, indented hilum with dense hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Ipomoea aquatica. Seeds with a round, indented hilum with dense hairs. Photo by Julia Scher, USDA-APHIS-PPQ. Ipomoea aquatica. Seeds with a round, indented hilum with dense hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Ipomoea aquatica
Ipomoea aquatica. Seeds with a round, indented hilum with dense hairs. Photo by Julia Scher, USDA-APHIS-PPQ.

Ipomoea aquatica. Dark brown seeds. Photo by Julia Scher, USDA-APHIS-PPQ. Ipomoea aquatica. Dark brown seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Ipomoea aquatica
Ipomoea aquatica. Dark brown seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Ipomoea hederacea. Wedge-shaped seeds with a smooth surface. Ipomoea hederacea. Wedge-shaped seeds with a smooth surface.
Ipomoea hederacea
Ipomoea hederacea. Wedge-shaped seeds with a smooth surface.
From Left to Right: 1. Ipomoea hederacea 2. Ipomoea purpurea 3. Calystegia sepium 4. C onvolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds with two flat surfaces.  From Left to Right: 1. Ipomoea hederacea 2. Ipomoea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds with two flat surfaces. 
Ipomoea hederacea
From Left to Right: 1. Ipomoea hederacea 2. Ipomoea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds with two flat surfaces. 
Ipomoea nil. Seeds with a basal hilum axis that is not parallel to the axis.  Ipomoea nil. Seeds with a basal hilum axis that is not parallel to the axis. 
Ipomoea nil
Ipomoea nil. Seeds with a basal hilum axis that is not parallel to the axis. 

Ipomoea purpurea. Grayish-black seeds. Ipomoea purpurea. Grayish-black seeds.
Ipomoea purpurea
Ipomoea purpurea. Grayish-black seeds.
Ipomoea purpurea . Grayish-black seeds. Ipomoea purpurea. Grayish-black seeds.
Ipomoea purpurea
Ipomoea purpurea. Grayish-black seeds.
From Left to Right: 1. Ipomoea hederacea 2. Ipomoea purpurea 3. Calystegia sepium 4. C onvolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia . Seeds are minutely grained with large, wavy ridges. From Left to Right: 1. Ipomoea hederacea 2. Ipomoea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds are minutely grained with large, wavy ridges.
Ipomoea purpurea
From Left to Right: 1. Ipomoea hederacea 2. Ipomoea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds are minutely grained with large, wavy ridges.
Ipomoea sp. Seeds with a longitudinal hilum that follows the rib. Ipomoea sp. Seeds with a longitudinal hilum that follows the rib.
Ipomoea sp.
Ipomoea sp. Seeds with a longitudinal hilum that follows the rib.