Poa arida |
Poa compressa |
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Canada bluegrass |
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Habit | Plants perennial, 15–60 cm tall; loosely cespitose or with solitary shoots, extensively rhizomatous. | |
Culms | wiry, strongly compressed; nodes strongly compressed; some proximal nodes usually exserted. |
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Basal branching | intra- and extravaginal or mostly extravaginal. |
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Leaves | sheaths closed to 20% of their length; ligules 1–3 mm; blades flat, 1.5–4 mm wide; cauline blades subequal. |
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Inflorescences | erect, lanceoloid to ovoid, often interrupted; sparse to congested, 2–10 cm; spikelets 15–80; branches erect to ascending, or infrequently spreading, 0.5–3 cm, 1–3 per node, with 1–15 spikelets. |
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Spikelets | (2.3)3.5–7 mm; florets (2)3–7(8). |
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Glumes | lower glumes 3-veined. |
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Calluses | with cobwebby hairs; less often glabrous. |
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Lemmas | lanceolate, 2.3–3.5 mm, distinctly keeled; keels and marginal veins short-villous; area between veins glabrous; tips acute. |
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Anthers | 1.3–1.8 mm. |
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2n | =42. |
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Poa arida |
Poa compressa |
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Distribution | ||
Discussion | Roadsides, moist or mesic meadows, disturbed areas, pavement cracks. 0–2000 m. All ecoregions except Owy. CA, ID, NV, WA; throughout North America; nearly worldwide. Exotic. Poa compressa is characterized by its compressed culms and nodes, rhizomatous habit, lower culm nodes exserted from the leaf sheaths, and proportionately small inflorescences with scabrous panicle branches. |
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Source | Flora of Oregon, volume 1, page 455 Rob Soreng, Barbara Wilson, Richard Brainerd, Nick Otting |
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Sibling taxa | ||
Web links |
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