Poa douglasii |
Poa macrantha |
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seashore bluegrass |
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Habit | Plants perennial, dioecious, (7)15–60 cm tall; loosely cespitose, rhizomatous, and stoloniferous, rhizomes and stolons to 400 cm long. | |
Culms | stout, 1.5–2 mm thick; nodes terete, 0(1) exserted. |
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Basal branching | mainly intravaginal; some extravaginal. |
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Leaves | sheaths closed about 50% of their length, bases of basal sheaths glabrous; collars smooth, glabrous; ligules 1–5 mm; blades moderately to densely scabrous or minutely hairy on and between veins, blades of tillers to 30 cm; cauline blades involute; somewhat arcuate, 2–4 mm wide; uppermost blades 1–10 cm. |
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Inflorescences | erect; ovoid to lanceolate, contracted, often interrupted, 3–15 cm; spikelets 15–80; branches 1-2; erect, 1–6 cm; stiff, with 3–17 spikelets. |
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Spikelets | 9–17 mm; to 3 times as long as wide; florets 3–6(10). |
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Glumes | broadly lanceolate, subequal to adjacent florets; keels sparsely scabrous near tips; lower glumes 3-veined; upper glumes usually more than 7 mm, 3–5-veined. |
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Calluses | usually with a line of crisp to sinuous hairs around the base of the lemma, sometimes glabrous or with diffuse; short; cobwebby hairs. |
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Lemmas | lanceolate; (6)7.5–11 mm, 5–7(11)-veined, distinctly keeled; keels and marginal veins, sometimes also intermediate veins; short-villous to softly puberulent; area between veins smooth to scabrous, glabrous or softly puberulent; tips acute. |
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Anthers | vestigial and 0.1–0.2 mm, or (2)3–4(5)mm. |
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2n | =28. |
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Poa douglasii |
Poa macrantha |
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Distribution | ||
Discussion | Coastal sand dunes. 0–100m. Est. CA, WA; north to AK. Native. |
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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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