UW Burke Herbarium species comparison

Sheaths closed;

ligules 0.5-1 mm. long, hairy;

blades flat, 1.5-4 mm. broad.

Sheaths closed, often with a few long hairs at the throat;

ligules 2-3 mm. long;

blades lax, flat, 5-10 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 an open panicle 10-18 cm. long, the slender branches drooping;

spikelets 5- to 7-flowered, 20-28 mm. long; first glume 5-8 mm. long, 1-nerved, the second 7-10 mm. long, 3-nerved;

lemmas pubescent along the marginal nerves but glabrous toward the tip, 8-13 mm. long, with awns 3-8 mm. long from the bifid apex;

anthers exerted.