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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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Amaranthus hypochondriacus. Black.

Amaranthus hypochondriacus
Amaranthus hypochondriacus. Black.

Amaranthus hypochondriacus. Face view of seed. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus hypochondriacus
Amaranthus hypochondriacus. Face view of seed. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri. Hilum in notch. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri
Amaranthus palmeri. Hilum in notch. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri. Looking down on the hilar region. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri
Amaranthus palmeri. Looking down on the hilar region. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri. Utricle. Hilum at right. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri
Amaranthus palmeri. Utricle. Hilum at right. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri. Close-up of hilum. Note white funicular remnant. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri
Amaranthus palmeri. Close-up of hilum. Note white funicular remnant. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri. Close up of seed surface. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus palmeri
Amaranthus palmeri. Close up of seed surface. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus retroflexus. Seeds with a detectable embryo on the margin.

Amaranthus retroflexus
Amaranthus retroflexus. Seeds with a detectable embryo on the margin.

Amaranthus retroflexus. Face view of seed. Hilum in notch. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus retroflexus
Amaranthus retroflexus. Face view of seed. Hilum in notch. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus retroflexus. Close-up view of hilum. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus retroflexus
Amaranthus retroflexus. Close-up view of hilum. Photo courtesy of USDA-APHIS-PPQ.

Amaranthus sp. Seeds of the various species have different seed coats that are not black. Fruit coats and floral parts are sometimes attached. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Amaranthus sp.
Amaranthus sp. Seeds of the various species have different seed coats that are not black. Fruit coats and floral parts are sometimes attached. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Amberboa moschata. Large oblique scar at base. White, flat pappus.

Amberboa moschata
Amberboa moschata. Large oblique scar at base. White, flat pappus.

Amberboa moschata. Large oblique scar at base. White, flat pappus.

Amberboa moschata
Amberboa moschata. Large oblique scar at base. White, flat pappus.

From Left to Right: 1. Ambrosia trifida 2. Ambrosia artemisifolia upper central figure achene (fruit) upper right: cross-section showing outside layers of the head, achene, and seed.

Ambrosia artemisiifolia
From Left to Right: 1. Ambrosia trifida 2. Ambrosia artemisifolia upper central figure achene (fruit) upper right: cross-section showing outside layers of the head, achene, and seed.

Ambrosia artemisiifolia. The Ambrosia "seed" is equivalent to a "head" in the Asteraceae family. The spikes are the ends of the involucre bracts subtending the head. The seed is then a combination of the involucre, the pericarp, and the true seed. It may be described as an achene in an involucre.

Ambrosia artemisiifolia
Ambrosia artemisiifolia. The Ambrosia "seed" is equivalent to a "head" in the Asteraceae family. The spikes are the ends of the involucre bracts subtending the head. The seed is then a combination of the involucre, the pericarp, and the true seed. It may be described as an achene in an involucre.

From Left to Right: 1. Ambrosia artemisiifolia 2. Ambrosia psilostachya 3. Ambrosia trifida.

Ambrosia artemisiifolia
From Left to Right: 1. Ambrosia artemisiifolia 2. Ambrosia psilostachya 3. Ambrosia trifida.

Ambrosia artemisiifolia. Multiple views of fruit. Burs (=disseminules). Photo by Michael K. Kirkpatrick, USDA-APHIS-PPQ.

Ambrosia artemisiifolia
Ambrosia artemisiifolia. Multiple views of fruit. Burs (=disseminules). Photo by Michael K. Kirkpatrick, USDA-APHIS-PPQ.

From Left to Right: 1. Ambrosia tomentosa 2. Ambrosia gray 3. Ambrosia confertiflora.

Ambrosia confertiflora
From Left to Right: 1. Ambrosia tomentosa 2. Ambrosia gray 3. Ambrosia confertiflora.

Ambrosia dumosa. Burr with flat spine apexes.

Ambrosia dumosa
Ambrosia dumosa. Burr with flat spine apexes.

Ambrosia grayi. Seed type is best described as an achene in an involucre. Largest of the bursages. Bristles and pubescence are mostly on the apical half.

Ambrosia grayi
Ambrosia grayi. Seed type is best described as an achene in an involucre. Largest of the bursages. Bristles and pubescence are mostly on the apical half.

From Left to Right: 1. Ambrosia tomentosa 2. Ambrosia gray 3. Ambrosia confertiflora.

Ambrosia grayi
From Left to Right: 1. Ambrosia tomentosa 2. Ambrosia gray 3. Ambrosia confertiflora.

From Left to Right: 1. Ambrosia artemisiifolia 2. Ambrosia psilostachya 3. Ambrosia trifida.

Ambrosia psilostachya
From Left to Right: 1. Ambrosia artemisiifolia 2. Ambrosia psilostachya 3. Ambrosia trifida.

Ambrosia psilostachya. Achenes with a blunt terminal point with some pubescence.

Ambrosia psilostachya
Ambrosia psilostachya. Achenes with a blunt terminal point with some pubescence.

Ambrosia psilostachya. Lateral view of fruit. Close-up of disseminule. Photo courtesy of USDA-APHIS-PPQ.

Ambrosia psilostachya
Ambrosia psilostachya. Lateral view of fruit. Close-up of disseminule. Photo courtesy of USDA-APHIS-PPQ.

Ambrosia tomentosa. Seed type is best described as an achene enclosed in an involucre. Mid-sized bursae. Usually with two terminal spikes.

Ambrosia tomentosa
Ambrosia tomentosa. Seed type is best described as an achene enclosed in an involucre. Mid-sized bursae. Usually with two terminal spikes.

From Left to Right: 1. Ambrosia tomentosa 2. Ambrosia grayi 3. Ambrosia confertiflora.

Ambrosia tomentosa
From Left to Right: 1. Ambrosia tomentosa 2. Ambrosia grayi 3. Ambrosia confertiflora.

Ambrosia trifida. Terminal spine surrounded by a ring of blunt spines.

Ambrosia trifida
Ambrosia trifida. Terminal spine surrounded by a ring of blunt spines.

From Left to Right: 1. Ambrosia artemisiifolia 2. Ambrosia psilostachya 3. Ambrosia trifida.

Ambrosia trifida
From Left to Right: 1. Ambrosia artemisiifolia 2. Ambrosia psilostachya 3. Ambrosia trifida.

Amelichloa brachychaeta.

Amelichloa brachychaeta
Amelichloa brachychaeta.

Ammi majus. Obovate mericarps.

Ammi majus
Ammi majus. Obovate mericarps.

Ammi majus. Strong ridges with weak intermediate ridges.

Ammi majus
Ammi majus. Strong ridges with weak intermediate ridges.

Ammobium alatum. Oblanceolate achene.

Ammobium alatum
Ammobium alatum. Oblanceolate achene.

Amorpha canescens. The hilum is lateral near the base with the radicle. short, and strongly out-turned. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Amorpha canescens
Amorpha canescens. The hilum is lateral near the base with the radicle. short, and strongly out-turned. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Amorpha canescens. Seeds borne singly in a glandular pod.

Amorpha canescens
Amorpha canescens. Seeds borne singly in a glandular pod.

Amsinckia menziesii var. intermedia. Nutlets are obovate to spatulate in the dorsal view. Surface warty with a central longitudinal ridge. The scar is narrow and about one-half the length of the nutlet on the ventral side.

Amsinckia menziesii var. intermedia
Amsinckia menziesii var. intermedia. Nutlets are obovate to spatulate in the dorsal view. Surface warty with a central longitudinal ridge. The scar is narrow and about one-half the length of the nutlet on the ventral side.

Amsinckia menziesii var. intermedia. Nutlets in various positions. Photo courtesy of USDA-APHIS-PPQ.

Amsinckia menziesii var. intermedia
Amsinckia menziesii var. intermedia. Nutlets in various positions. Photo courtesy of USDA-APHIS-PPQ.

Amsinckia tessellata. Nutlets are spatulate from a dorsal view. The surface is extremely warty, which often forms minor transverse ridges. Surface texture is very hard and can appear porcelain-like. A scar is spatulate and central on the ventral side.

Amsinckia tessellata
Amsinckia tessellata. Nutlets are spatulate from a dorsal view. The surface is extremely warty, which often forms minor transverse ridges. Surface texture is very hard and can appear porcelain-like. A scar is spatulate and central on the ventral side.

Amsinckia tessellata. Ventral / adaxial view of fruit. Adaxial side of nutlet showing fruit attachment scar. Photo courtesy of USDA-APHIS-PPQ.

Amsinckia tessellata
Amsinckia tessellata. Ventral / adaxial view of fruit. Adaxial side of nutlet showing fruit attachment scar. Photo courtesy of USDA-APHIS-PPQ.

Anagallis arvensis. Blocky and irregularly shaped true seeds.

Anagallis arvensis
Anagallis arvensis. Blocky and irregularly shaped true seeds.

Anagallis arvensis. Red surface with light to dark brown granules.

Anagallis arvensis
Anagallis arvensis. Red surface with light to dark brown granules.

SeedImages