Aristida adscensionis |
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sixweeks three-awn |
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Habit | Plants annual, (3)10–50(80)cm tall, tufted. |
Culms | much branched above the base, with solid internodes. |
Leaves | sheaths glabrous; ligules about 0.5 mm, with a fringe of dense hairs; blades 2–14 cm × 1–2.5 mm; flat to involute. |
Inflorescences | panicles, 5–15(20) × 0.5–3 cm; branches erect to ascending. |
Spikelets | 5–8 mm. |
Glumes | subequal to lemmas, 1-veined, glabrous, acuminate to short-awned; lower glumes 4–8 mm; upper glumes 6–11 mm. |
Calluses | 0.5–0.8 mm; hairy. |
Lemmas | 6–9 mm, 3-veined; leathery; midveins scabrous, glabrous elsewhere; lemma awns 3; the central awn 7–15(20)mm; the lateral awns somewhat shorter, occasionally only 1–2 mm, flattened near the base; straight to somewhat curved. |
Anthers | 3, 0.3–0.7 mm. |
2n | =22, 33, 44. |
Aristida adscensionis |
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Distribution | |
Discussion | Waste ground, roadsides, degraded rangelands, and dry hillsides, often in sandy soils. 800–1200m. Lava. CA, ID, NV, WA; southwestern states and scattered elsewhere in US; South America. Exotic. |
Source | Flora of Oregon, volume 1, page 361 Barbara Wilson, Richard Brainerd, Nick Otting |
Sibling taxa | |
Web links |