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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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Avena fatua.  Lanceolate floret. Photo by Julia Scher, USDA-APHIS-PPQ. Avena fatua. Lanceolate floret. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena fatua
Avena fatua. Lanceolate floret. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena fatua.  Awn arising from the middle of the lemma. Photo by Julia Scher, USDA-APHIS-PPQ. Avena fatua. Awn arising from the middle of the lemma. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena fatua
Avena fatua. Awn arising from the middle of the lemma. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena fatua.  Photo by Julia Scher, USDA-APHIS-PPQ. Avena fatua. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena fatua
Avena fatua. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena nuda.  Oblong caryopsis with missing lemma and palea. Avena nuda. Oblong caryopsis with missing lemma and palea.
Avena nuda
Avena nuda. Oblong caryopsis with missing lemma and palea.

Avena sativa.  Awn is often not present. Avena sativa. Awn is often not present.
Avena sativa
Avena sativa. Awn is often not present.
Avena sterilis.  Floret. Avena sterilis. Floret.
Avena sterilis
Avena sterilis. Floret.
Avena sterilis.  Long Lanceolate caryopsis. Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Long Lanceolate caryopsis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Long Lanceolate caryopsis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis.  Strong, geniculated awn. Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Strong, geniculated awn. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Strong, geniculated awn. Photo by Julia Scher, USDA-APHIS-PPQ.

Avena sterilis.  Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis.  Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis.  Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis.  Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.

Avena sterilis.  Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis.  Callus with many reddish hairs. Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Callus with many reddish hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Callus with many reddish hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis.  Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis.  Photo by Julia Scher, USDA-APHIS-PPQ. Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.
Avena sterilis
Avena sterilis. Photo by Julia Scher, USDA-APHIS-PPQ.

Axonopus fissifolius.  Marginal nerves with long, fine pubescence. Axonopus fissifolius. Marginal nerves with long, fine pubescence.
Axonopus fissifolius
Axonopus fissifolius. Marginal nerves with long, fine pubescence.
Azolla pinnata . Photo by Julia Scher, USDA-APHIS-PPQ. Azolla pinnata. Photo by Julia Scher, USDA-APHIS-PPQ.
Azolla pinnata
Azolla pinnata. Photo by Julia Scher, USDA-APHIS-PPQ.
Azolla pinnata . Photo by Julia Scher, USDA-APHIS-PPQ. Azolla pinnata. Photo by Julia Scher, USDA-APHIS-PPQ.
Azolla pinnata
Azolla pinnata. Photo by Julia Scher, USDA-APHIS-PPQ.
Azolla pinnata . Photo by Julia Scher, USDA-APHIS-PPQ. Azolla pinnata. Photo by Julia Scher, USDA-APHIS-PPQ.
Azolla pinnata
Azolla pinnata. Photo by Julia Scher, USDA-APHIS-PPQ.

Azolla pinnata . Photo by Julia Scher, USDA-APHIS-PPQ. Azolla pinnata. Photo by Julia Scher, USDA-APHIS-PPQ.
Azolla pinnata
Azolla pinnata. Photo by Julia Scher, USDA-APHIS-PPQ.
Baccharis emoryi. Achenes with a long pappus that may be attached to the apical end. Baccharis emoryi. Achenes with a long pappus that may be attached to the apical end.
Baccharis emoryi
Baccharis emoryi. Achenes with a long pappus that may be attached to the apical end.
Bahiopsis laciniata. Achenes with coarse, appressed hairs at the apex. Bahiopsis laciniata. Achenes with coarse, appressed hairs at the apex.
Bahiopsis laciniata
Bahiopsis laciniata. Achenes with coarse, appressed hairs at the apex.
Baileya multiradiata. Scurfy achenes with slightly indented sides. Baileya multiradiata. Scurfy achenes with slightly indented sides.
Baileya multiradiata
Baileya multiradiata. Scurfy achenes with slightly indented sides.

From Left to Right: 1 . Barbarea vulgaris 2. Barbarea verna.  From Left to Right: 1. Barbarea vulgaris 2. Barbarea verna. 
Barbarea verna
From Left to Right: 1. Barbarea vulgaris 2. Barbarea verna. 
Barbarea verna. Seeds are covered with a well-developed reticulum made of thin brown ridges, making narrow, deep, and glossy interspaces.  Barbarea verna. Seeds are covered with a well-developed reticulum made of thin brown ridges, making narrow, deep, and glossy interspaces. 
Barbarea verna
Barbarea verna. Seeds are covered with a well-developed reticulum made of thin brown ridges, making narrow, deep, and glossy interspaces. 
From Left to Right: 1. Barbarea vulgaris 2. Barbarea verna.   From Left to Right: 1. Barbarea vulgaris 2. Barbarea verna. 
Barbarea vulgaris
From Left to Right: 1. Barbarea vulgaris 2. Barbarea verna. 
Barbarea vulgaris. Small, bronze seeds with a hilum at the basal end. Barbarea vulgaris. Small, bronze seeds with a hilum at the basal end.
Barbarea vulgaris
Barbarea vulgaris. Small, bronze seeds with a hilum at the basal end.

Barbarea vulgaris. Seeds with a uniform reticulum. Barbarea vulgaris. Seeds with a uniform reticulum.
Barbarea vulgaris
Barbarea vulgaris. Seeds with a uniform reticulum.
Basella alba. Clusters with a large, white base and stipples between the ridges. Basella alba. Clusters with a large, white base and stipples between the ridges.
Basella alba
Basella alba. Clusters with a large, white base and stipples between the ridges.
Bassia scoparia. Seeds with the pericarp and sepals are often present.  Bassia scoparia. Seeds with the pericarp and sepals are often present. 
Bassia scoparia
Bassia scoparia. Seeds with the pericarp and sepals are often present. 
Bassia scoparia. Apical view of fruit. Two disseminules with tubercles, two with wings. Photo courtesy of USDA-APHIS-PPQ. Bassia scoparia. Apical view of fruit. Two disseminules with tubercles, two with wings. Photo courtesy of USDA-APHIS-PPQ.
Bassia scoparia
Bassia scoparia. Apical view of fruit. Two disseminules with tubercles, two with wings. Photo courtesy of USDA-APHIS-PPQ.

Beckmannia syzigachne. Spikelets with large bulbous glumes. Beckmannia syzigachne. Spikelets with large bulbous glumes.
Beckmannia syzigachne
Beckmannia syzigachne. Spikelets with large bulbous glumes.
Beckmannia syzigachne. Caryopses and spikelet tissue. Photo by Anna Margina, USDA-APHIS-PPQ. Beckmannia syzigachne. Caryopses and spikelet tissue. Photo by Anna Margina, USDA-APHIS-PPQ.
Beckmannia syzigachne
Beckmannia syzigachne. Caryopses and spikelet tissue. Photo by Anna Margina, USDA-APHIS-PPQ.
Begonia sp. Seeds with a strong style segment at the base. Begonia sp. Seeds with a strong style segment at the base.
Begonia sp.
Begonia sp. Seeds with a strong style segment at the base.
Belamcanda chinensis.  Seeds are black with brown mottling. Belamcanda chinensis. Seeds are black with brown mottling.
Belamcanda chinensis
Belamcanda chinensis. Seeds are black with brown mottling.

Bellis perennis . Seeds with appressed hairs on the sides. Bellis perennis. Seeds with appressed hairs on the sides.
Bellis perennis
Bellis perennis. Seeds with appressed hairs on the sides.
Berteroa incana. Seeds with indentations on the flat surface reveal the configuration of the embryo within. Berteroa incana. Seeds with indentations on the flat surface reveal the configuration of the embryo within.
Berteroa incana
Berteroa incana. Seeds with indentations on the flat surface reveal the configuration of the embryo within.
Beta vulgaris
Beta vulgaris. Polygerm fruit with woody perianths. Photo by Madeline Maher, USDA-APHIS-PPQ. Beta vulgaris. Polygerm fruit with woody perianths. Photo by Madeline Maher, USDA-APHIS-PPQ.
Beta vulgaris
Beta vulgaris. Polygerm fruit with woody perianths. Photo by Madeline Maher, USDA-APHIS-PPQ.