Avena fatua |
Avena occidentalis |
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wild oats |
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Leaves | blades 10– 45 cm × 3–15(25) mm; flat or occasionally involute, scabrous. |
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Inflorescences | 7–40 × 6–12 cm; branches spreading; disarticulation beneath each floret. |
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Spikelets | 18– 32 mm with 2–3(5) florets. |
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Glumes | 18–32 mm with 9–11 veins; awnless. |
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Plant | 8–160 cm tall. |
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Calluses | hairs to 25% as long as the lemmas. |
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Lemmas | 14–22 mm with 5–9 veins; leathery; thin and membranous at the tip, densely pubescent below mid-length, sometimes sparsely pubescent or glabrous; tips bifid; teeth 0.3–1.5 mm but lacking long bristle-like tips; lemma awns 23–42 mm, arising in the middle 33% of the lemma backs. |
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Anthers | about 3 mm. |
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2n | =42. |
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Avena fatua |
Avena occidentalis |
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Distribution | ||
Discussion | Disturbed areas, roadsides, grain fields, upland grasslands. 0–1100m. BR, BW, CR, Est, Lava, Sisk, WV. CA, ID, NV, WA; throughout North America; worldwide. Exotic. Avena fatua invades upland grasslands, displacing native prairie species. It also can be a serious weed in grain crops. It may be the ancestor of cultivated A. sativa. Avena fatua × A. sativa hybrids resemble A. sativa but lack lobes on the wings of the lodicules and may have an awn on the lowest lemma. |
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Source | Flora of Oregon, volume 1, page 363 Barbara Wilson, Richard Brainerd, Nick Otting |
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Sibling taxa | ||
Web links |
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