Poa arida |
Poa unilateralis |
|
---|---|---|
San Francisco bluegrass |
||
Habit | Plants perennial, 5–40 cm long, frequently glaucous; densely cespitose. | |
Basal branching | intra- and extravaginal or mainly intravaginal. |
|
Leaves | sheaths closed 10(20)% of their length, bases of basal sheaths glabrous; ligules (0.8)2–6 mm long, blades of tillers usually 1–1.5 mm wide; thin; soon withering, distinctly narrower than those of the culm, infrequently broad and flat, or involute; cauline blades flat or folded, 2–5 mm wide; soft; thin and soon withering or moderately thick and somewhat fleshy and retaining their form; smooth; blades gradually reduced in length higher on the culm. |
|
Inflorescences | erect, nearly cylindrical, contracted, 3–7 cm; spikelets (20)30–80(120); branches 0.5–1.5(4.5)cm long, 3–7 per node, densely papillose and sparsely scabrous. |
|
Spikelets | lanceolate to narrowly ovate; to 3.5 times as long as wide, 4.5–7 mm; florets 3–5. |
|
Glumes | lanceolate, slightly unequal; keels smooth and papillate or scabrous; lower glumes 3-veined. |
|
Calluses | glabrous or with a crown of tiny crisp hairs around the base; hairs 0.1–0.2 mm long. |
|
Lemmas | lanceolate, distinctly keeled, 3–4.5 mm, glabrous, or keels and marginal veins short-villous on proximal half, sparsely crisply puberulent near the base; margins glabrous; tips acute. |
|
Anthers | 1.5–3 mm. |
|
Poa arida |
Poa unilateralis |
|
Distribution | ||
Discussion | 2 subspecies. Poa unilateralis is a cespitose grass with dense inflorescences that grows on coastal headlands. Its leaf sheaths are open most of their length, and its calluses are glabrous or nearly so. |
|
Source | Flora of Oregon, volume 1, page 467 Rob Soreng, Barbara Wilson, Richard Brainerd, Nick Otting |
|
Sibling taxa | ||
Subordinate taxa | ||
Web links |