UW Burke Herbarium species comparison

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Poa arida

Poa pratensis

Kentucky bluegrass
Habit Strongly rhizomatous perennial, the culms hollow, glabrous, 4-10 dm. tall.
Leaves

Sheaths closed about half their length;

ligules 1-1.5 mm. long, truncate, usually entire;

blades flat, numerous, 2-4 mm. broad, the tips strongly prow-shaped.
Flowers

Inflorescence a moderately loose panicle 3-10 cm. long, the branches slightly ascending, the lower ones 3-5 per node;

spikelets 3- to 5-flowered;

glumes 2.5 and 3 mm. long, strongly keeled;

lemmas about 3.5 mm. long, strongly keeled, cobwebby at the base;

palea subequal to the lemma, 2-keeled.

Poa arida

Poa pratensis
Flowering time April-October
Habitat Moist, distrurbed areas from the coast to middle elevations.
Distribution
[WildflowerSearch map]
[BONAP county map]
Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast: circumboreal.
[WildflowerSearch map]
[BONAP county map]
Origin Both native and introduced
Conservation status Not of concern
Sibling taxa
P. alpina, P. annua, P. arctica, P. bolanderi, P. bulbosa, P. compressa, P. confinis, P. curtifolia, P. cusickii, P. fendleriana, P. glauca, P. howellii, P. infirma, P. interior, P. laxiflora, P. leibergii, P. leptocoma, P. lettermanii, P. macrantha, P. marcida, P. ×multnomae, P. nemoralis, P. nervosa, P. palustris, P. paucispicula, P. pratensis, P. secunda, P. stenantha, P. suksdorfii, P. trivialis, P. unilateralis, P. wheeleri
P. alpina, P. annua, P. arctica, P. bolanderi, P. bulbosa, P. compressa, P. confinis, P. curtifolia, P. cusickii, P. fendleriana, P. glauca, P. howellii, P. infirma, P. interior, P. laxiflora, P. leibergii, P. leptocoma, P. lettermanii, P. macrantha, P. marcida, P. ×multnomae, P. nemoralis, P. nervosa, P. palustris, P. paucispicula, P. secunda, P. stenantha, P. suksdorfii, P. trivialis, P. unilateralis, P. wheeleri
Subordinate taxa
P. pratensis ssp. angustifolia, P. pratensis ssp. irrigata, P. pratensis ssp. pratensis
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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