Avena fatua |
Avena barbata |
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wild oat |
barbed oat |
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Habit | Annuals, the culms to 1 m. tall, hollow. | Annuals up to 1 m. tall, the culms hollow, glabrous or with a few long hairs. |
Leaves | Sheaths open; ligules 3-6 mm. long, obtuse to acute, puberulent; blades 3-10 mm. broad, scabrous, often with a few long hairs. |
Sheath open; ligules 2-4 mm. long, puberulent, obtuse; blades 3-6 mm. broad, scabrous, flat. |
Flowers | Inflorescence a large, open panicle, the spikelets pendulous; spikelets usually 3-flowered, the rachilla readily disarticulating between the florets, strongly bearded; glumes membranous, the first 7-nerved, the second 9-nerved; lemmas densely bearded on the callus, the upper portion greenish, but the tip membranous and acutely bilobed for 1 mm.; first 2 florets with twisted, strongly-bent awns up to 4 cm. long; lodicules 2 mm. long. |
Inflorescence a large, open panicle, the spikelets pendulous; spikelets 2- or 3-flowered; glumes 2.2-2.5 cm. long, exceeding the upper floret, membranous, the first 7-nerved, the second 9-nerved; lemmas with stiff, reddish hairs on the lower half, split at the tip into 2 pointed teeth; paleas shorter than the lemmas; rachilla prolonged behind the upper floret; lodicules 2 mm. long. |
Fruits | Utricle |
Utricle |
Avena fatua |
Avena barbata |
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Flowering time | May-September | May-June |
Habitat | Fields, roadsides, wastelots, and other disturbed areas. | Fields, roadsides, wastelots, and other disturbed areas. |
Distribution | Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
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Occurring chiefly west of the Cascades crest in Washington; Washington to California, east to Montana, Arizona, and New Mexico.
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Origin | Introduced from Eurasia | Introduced Eurasian |
Conservation status | Not of concern | Not of concern |
Sibling taxa | ||
Web links |
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