Poa arida |
Poa marcida |
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withered bluegrass |
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Habit | Plants perennial, dioecious, 20–80 cm tall, loosely to densely cespitose. | |
Basal branching | mainly pseudointravaginal. |
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Leaves | sheaths closed approximatly 90% of their length; to near the collar; ligules 0.5–2 mm long; blades flat, 1.5–5 mm wide. |
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Inflorescences | lax, narrowly lanceolate, 6–22 cm; sparse; branches ascending, 1–3 per node. |
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Spikelets | 3.5–7 mm; florets (1)2(4); rachilla internodes about 1 mm long. |
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Glumes | keels scabrous; lower glumes 1-veined; upper glumes shorter than or subequal to lowest lemma. |
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Calluses | with sparse cobwebby hairs. |
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Lemmas | narrowly lanceolate, 3.2–5 mm long, distinctly keeled, glabrous; smooth; tips acuminate. |
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Anthers | 0.5–1.2 mm. |
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Poa arida |
Poa marcida |
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Distribution | ||
Discussion | Moist, late successional conifer forests. 0–1100m. Casc, CR, Est. WA; north to British Columbia. Native. Poa marcida has narrow, nodding, few-branched inflorescences with branches that parallel the inflorescence axis. The lemmas are long and taper more gradually than other Poa species. Poa laxiflora also has nodding inflorescences, but its branches are strongly spreading, and its lemma tips are more rounded. |
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Source | Flora of Oregon, volume 1, page 460 Rob Soreng, Barbara Wilson, Richard Brainerd, Nick Otting |
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Sibling taxa | ||
Web links |
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