UW Burke Herbarium species comparison

Sheaths open;

ligules truncate to obtuse, 3-6 mm. long, usually lacerate;

blades flat or folded, 4-10 mm. broad.

Sheaths open, smooth;

ligules 3-8 mm. long, obtuse and lacerate;

blades flat, scabrous, 2-10 mm. broad.

Inflorescence a compressed to somewhat open panicle 5-30 cm. long, usually purplish, bearing spikelets nearly to the base;

spikelets 1-flowered, articulate above the glumes;

glumes subequal, 2-2.5 mm. long, acute;

lemmas 2/3 to 3/4 as long as the glumes, scabrous on the keel, awnless;

palea over 1/2 as long as the lemma;

lodicules 2, 0.4 mm. long.

Inflorescence a congested to open panicle 5-25 cm. long, the branches ascending to erect, green to purplish, scabrous throughout;

spikelets 1-flowered, articulate above the glume;

glumes 2.5-4.5 mm. long, pointed, often with an awn or bristle tip, the second glume somewhat shorter than the first;

lemma 1.5-2.5 mm. long, always shorter than the second glume, sometimes awned from above midlength;

callus slightly bearded;

palea 0.2-0.5 mm. long;

lodicules 2, 0.3-0.5 mm. long

Utricle