Poa leptocoma |
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bog bluegrass |
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Habit | Plants perennial, 15–100 cm, often partially purplish, more or less cespitose. |
Basal branching | mostly extravaginal. |
Leaves | sheaths closed 25–67% of their length; smooth or sparsely scabrous; ligules 1.5– 4(6)mm; blades flat, 1–4 mm wide. |
Inflorescences | lax; open; sparse, 5–15 cm; branches spreading to reflexed; capillary; (2)3– 8 cm, 1–3(5) per node, usually moderately scabrous, with (3)4– 15 spikelets. |
Spikelets | lanceolate or narrowly lanceolate, 4–8 mm, green, or partly purple to dark purple; florets 2–5. |
Glumes | tapered from the base or lanceolate; thin; keels usually scabrous; lower glumes 1-veined; upper glumes distinctly shorter than to nearly equaling lowest lemma. |
Calluses | with sparse cobwebby hairs. |
Lemmas | lanceolate, 3–4 mm, often partly purple, distinctly keeled; thin; smooth, or sparsely scabrous near the tip; keels softly puberulent to long-villous on 25–67% the length; marginal veins softly puberulent to long-villous; hairs frequently sparse; lateral veins and area between veins glabrous; margins infolded; tips sharply acute to acuminate, usually bronze-colored. |
Anthers | 0.2–1.1 mm. |
2n | =42. |
Poa leptocoma |
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Distribution | |
Discussion | Montane to alpine streamsides, lakeshores, and wet meadows. 1100–2800m. BR, BW, Casc, ECas, Sisk. CA, ID, NV, WA; western Canada and US; Asia. Native. Poa leptocoma is a loosely cespitose grass with short anthers and somewhat open panicles. It is most similar to P. reflexa, a plant of drier habitats that has less scabrous panicle branches, longer anthers, and sparsely hairy lateral lemma veins, at least on one side of the lemma. |
Source | Flora of Oregon, volume 1, page 459 Rob Soreng, Barbara Wilson, Richard Brainerd, Nick Otting |
Sibling taxa | |
Synonyms | Poa leptocoma ssp. leptocoma, Poa leptocoma var. leptocoma, Poa vaseyochloa |
Web links |
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