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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Clidemia hirta. Seeds with strong reticulations.

Clidemia hirta
Clidemia hirta. Seeds with strong reticulations.

Centaurea benedicta. Achenes with strong ribs and a large collar with a serrated edge.

Cnicus benedictus
Centaurea benedicta. Achenes with strong ribs and a large collar with a serrated edge.

Cobaea scandens. Flat and winged seeds with a linear hilum that extends from the base to the center.

Cobaea scandens
Cobaea scandens. Flat and winged seeds with a linear hilum that extends from the base to the center.

Coccinia grandis. The seed has a large, extended hilum, and the woolly pubescence is conspicuous.

Coccinia grandis
Coccinia grandis. The seed has a large, extended hilum, and the woolly pubescence is conspicuous.

Codonopsis pilosula. Seeds are shiny with very fine longitudinal lines.

Codonopsis pilosula
Codonopsis pilosula. Seeds are shiny with very fine longitudinal lines.

Coleostephus multicaulis. Achenes with a pappus ring that's extended laterally and is void of pappus hairs.

Coleostephus multicaulis
Coleostephus multicaulis. Achenes with a pappus ring that's extended laterally and is void of pappus hairs.

Collinsia heterophylla. Seeds with a hilum scar that is sunken in the center of the lateral side with rounded margins.

Collinsia heterophylla
Collinsia heterophylla. Seeds with a hilum scar that is sunken in the center of the lateral side with rounded margins.

Commelina benghalensis. Seeds with a long, narrow scar, which is the hilum.

Commelina benghalensis
Commelina benghalensis. Seeds with a long, narrow scar, which is the hilum.

Commelina benghalensis. Seeds with large, irregular ribs with scurfy texture between them.

Commelina benghalensis
Commelina benghalensis. Seeds with large, irregular ribs with scurfy texture between them.

Commelina benghalensis. Seeds with large, irregular ribs with scurfy texture between them. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina benghalensis
Commelina benghalensis. Seeds with large, irregular ribs with scurfy texture between them. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina benghalensis. Seed hilum.Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina benghalensis
Commelina benghalensis. Seed hilum.Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina benghalensis. Brown and mottled seeds. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina benghalensis
Commelina benghalensis. Brown and mottled seeds. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina benghalensis. Brown and mottled seeds, with a long scar as the hilum. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina benghalensis
Commelina benghalensis. Brown and mottled seeds, with a long scar as the hilum. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina coelestis. Granular seeds with a short rib on the side. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina coelestis
Commelina coelestis. Granular seeds with a short rib on the side. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina coelestis. Granular seeds with an irregular hilum on the side. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina coelestis
Commelina coelestis. Granular seeds with an irregular hilum on the side. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina communis. Seeds with a rib on the center of the flat side that extends from the base to near the apex. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina communis
Commelina communis. Seeds with a rib on the center of the flat side that extends from the base to near the apex. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina communis. Seeds are scabrous in lateral rows. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina communis
Commelina communis. Seeds are scabrous in lateral rows. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina communis. The hilum is on the side margin. Photo by Julia Scher, USDA-APHIS-PPQ.

Commelina communis
Commelina communis. The hilum is on the side margin. Photo by Julia Scher, USDA-APHIS-PPQ.

Conium maculatum. Mericarps with a large stylopodium.

Conium maculatum
Conium maculatum. Mericarps with a large stylopodium.

Conium maculatum. Multiple views of fruit. Looking down on the apical (left) and basal (right) ends of the mericarp. Adaxial side at top. Photo courtesy of USDA-APHIS-PPQ.

Conium maculatum
Conium maculatum. Multiple views of fruit. Looking down on the apical (left) and basal (right) ends of the mericarp. Adaxial side at top. Photo courtesy of USDA-APHIS-PPQ.

Conoclinium coelestinum. Achenes with a white pappus ring, with some retained pappus hairs.

Conoclinium coelestinum
Conoclinium coelestinum. Achenes with a white pappus ring, with some retained pappus hairs.

Conringia orientalis. Seeds with fine, square reticulations and a white hilum on the apical end.

Conringia orientalis
Conringia orientalis. Seeds with fine, square reticulations and a white hilum on the apical end.

Consolida ajacis. Seeds that are covered with continuous transverse ribs.

Consolida ajacis
Consolida ajacis. Seeds that are covered with continuous transverse ribs.

Consolida ajacis. Lateral view of seed. Looking down on a seed ridge. Photo courtesy of USDA-APHIS-PPQ.

Consolida ajacis
Consolida ajacis. Lateral view of seed. Looking down on a seed ridge. Photo courtesy of USDA-APHIS-PPQ.

Consolida orientalis. Seeds with closely spaced, continuous rows of papery ribs.

Consolida orientalis
Consolida orientalis. Seeds with closely spaced, continuous rows of papery ribs.

Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points.

Convolvulus arvensis
Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points.

Convolvulus arvensis. Seeds with two flat surfaces that reflect the crowding of the seeds within the ovary.

Convolvulus arvensis
Convolvulus arvensis. Seeds with two flat surfaces that reflect the crowding of the seeds within the ovary.

Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points.

Convolvulus arvensis
Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points.

From Left to Right: 1. Ipomea hederacea 2. Ipomea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds are covered with tuberculate, wavy lines or points.

Convolvulus arvensis
From Left to Right: 1. Ipomea hederacea 2. Ipomea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds are covered with tuberculate, wavy lines or points.

From Left to Right: 1. Convolvulus equitans 2. Calystegia sepium 3. Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points.

Convolvulus arvensis
From Left to Right: 1. Convolvulus equitans 2. Calystegia sepium 3. Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points.

Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points. Photo by Julia Scher, USDA-APHIS-PPQ.

Convolvulus arvensis
Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points. Photo by Julia Scher, USDA-APHIS-PPQ.

Convolvulus arvensis. Seeds with a large, blunt hilum. Photo by Julia Scher, USDA-APHIS-PPQ.

Convolvulus arvensis
Convolvulus arvensis. Seeds with a large, blunt hilum. Photo by Julia Scher, USDA-APHIS-PPQ.

Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points. Photo by Julia Scher, USDA-APHIS-PPQ.

Convolvulus arvensis
Convolvulus arvensis. Seeds are covered with tuberculate, wavy lines or points. Photo by Julia Scher, USDA-APHIS-PPQ.

Convolvulus arvensis. The seed hilum is kidney-shaped, and the surface is not parallel to the seed axis. Photo by Julia Scher, USDA-APHIS-PPQ.

Convolvulus arvensis
Convolvulus arvensis. The seed hilum is kidney-shaped, and the surface is not parallel to the seed axis. Photo by Julia Scher, USDA-APHIS-PPQ.

Convolvulus arvensis. Seed pods. Photo by Julia Scher, USDA-APHIS-PPQ.

Convolvulus arvensis
Convolvulus arvensis. Seed pods. Photo by Julia Scher, USDA-APHIS-PPQ.

From Left to Right: 1. Convolvulus equitans 2. Calystegia sepium 3. Convolvulus arvensis. Granular seeds.

Convolvulus equitans
From Left to Right: 1. Convolvulus equitans 2. Calystegia sepium 3. Convolvulus arvensis. Granular seeds.

From Left to Right: 1. Ipomea hederacea 2. Ipomea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds with a granular texture.

Convolvulus equitans
From Left to Right: 1. Ipomea hederacea 2. Ipomea purpurea 3. Calystegia sepium 4. Convolvulus arvensis 5. Convolvulus equitans 6. Jacquemontia tamnifolia. Seeds with a granular texture.

Convolvulus equitans. Seeds have a rough, granular texture.

Convolvulus equitans
Convolvulus equitans. Seeds have a rough, granular texture.