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Canada bluegrass

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.

Basal branching

intra- and extravaginal or mostly extravaginal.

Leaves

sheaths closed to 20% of their length;

ligules 1–3 mm;

blades flat, 1.5–4 mm wide;

cauline blades subequal.

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.

Spikelets

(2.3)3.5–7 mm;

florets (2)3–7(8).

Glumes

lower glumes 3-veined.

Calluses

with cobwebby hairs; less often glabrous.

Lemmas

lanceolate, 2.3–3.5 mm, distinctly keeled;

keels and marginal veins short-villous; area between veins glabrous;

tips acute.

Anthers

1.3–1.8 mm.

2n

=42.

Poa arida

Poa compressa

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
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.

Source Flora of Oregon, volume 1, page 455
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. 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
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