UW Burke Herbarium species comparison

Sheaths closed;

ligules 0.5-1 mm. long, hairy;

blades flat, 1.5-4 mm. broad.

Sheaths closed, usually pubescent;

auricles tiny, if any;

ligules 1-3 mm. long;

blades nearly flat, glabrous or pubescent, 3-12 mm. broad.

Inflorescence an erect, narrow, crowded panicle 3-10 cm. long, the spikelets exceeding the pedicles;

spikelets 5- to 7-flowered, 1-2 cm. long; first glume 4-6 mm. long, lanceolate, the second slightly longer and wider;

lemmas 6.5-8.5 mm. long, the area between the nerves depressed and concave;

lemmas with straight awns 6-10 mm. long from a bifid apex.

Inflorescence a narrow panicle 10-25 cm. long, the branches usually ascending;

spikelets 2-3 cm. long, strongly compressed, 5- to 10-flowered;

glumes lanceolate-acuminate, keeled, the first 5-9 mm. long, the second nearly twice as long;

lemmas keeled, shallowly bifid at the tip, with a straight awn 3-15 mm. long.

Utricle