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Howell's bluegrass

Habit Plants annual, rarely perennial, (10)25– 80(120) cm tall; densely cespitose.
Basal branching

intravaginal.

Leaves

sheaths closed 50% or more of their length;

ligules 1.5–5(10)mm, blades of tillers flat, 1–7(10) mm wide, finely scabrous;

cauline blades 2–10 cm.

Inflorescences

erect, eventually open, 10–25(30)cm; the branches eventually spreading or reflexed.

Spikelets

(2)4– 6 mm;

florets 2–5;

rachilla internodes about 1 mm; smooth, softly puberulent or occasionally glabrous.

Glumes

slightly unequal;

keels and sometimes lateral veins scabrous;

lower glumes 1–3-veined.

Culm

nodes terete.

Calluses

with sparse cobwebby hairs on at least some florets.

Lemmas

lanceolate to narrowly lanceolate, 2.5– 3.5 mm, distinctly keeled, evenly crisply puberulent near the base, finely scabrous distally;

margins narrowly hyaline;

tips narrowly acute, rarely purple.

Anthers

0.2–1 mm.

Poa cuspidata

Poa howellii

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Open, often moist woods and bottomlands, often with moss or boulders. 0–1100m. Casc, ECas, Sisk, WV. CA, WA; north to British Columbia. Native.

Source Flora of Oregon, volume 1, page 457
Rob Soreng, Barbara Wilson, Richard Brainerd, Nick Otting
Sibling taxa
P. alpina, P. annua, P. bolanderi, P. bulbosa, P. chambersii, P. compressa, P. confinis, P. cusickii, P. fendleriana, P. glauca, P. howellii, P. iconia, P. infirma, P. laxiflora, P. leibergii, P. leptocoma, P. lettermanii, P. macrantha, P. mansfieldii, P. marcida, P. nemoralis, P. nervosa, P. palustris, P. piperi, P. pratensis, P. pringlei, P. reflexa, P. rhizomata, P. secunda, P. stenantha, P. suksdorfii, P. trivialis, P. unilateralis, P. wallowensis, P. wheeleri
P. alpina, P. annua, P. bolanderi, P. bulbosa, P. chambersii, P. compressa, P. confinis, P. cusickii, P. fendleriana, P. glauca, P. iconia, P. infirma, P. laxiflora, P. leibergii, P. leptocoma, P. lettermanii, P. macrantha, P. mansfieldii, P. marcida, P. nemoralis, P. nervosa, P. palustris, P. piperi, P. pratensis, P. pringlei, P. reflexa, P. rhizomata, P. secunda, P. stenantha, P. suksdorfii, P. trivialis, P. unilateralis, P. wallowensis, P. wheeleri
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