Flora of North America species comparison

20-110 cm, erect or ascending.

80-150 cm, erect;

nodes 9-20, glabrous, usually concealed by the leaf sheaths;

internodes usually glabrous, sometimes hairy just below the nodes.

overlapping, densely to moderately retrorsely pilose or glabrous over most of their surface, throats and collars densely pilose;

auricles 1-2.5 mm on most lower leaves;

ligules 0.8-1.4 mm, hirsute, ciliate, truncate, erose;

blades 20-30 cm long, 5-15 mm wide, flat, usually glabrous, rarely pilose, with 2 prominent flanges at the collar.

4-16 cm long, 2-3 cm wide, erect, open;

branches sometimes longer than the spikelets, slender, usually ascending, slightly curved or straight.

10-22 cm, open, nodding;

branches spreading to ascending.

12-20 mm, lanceolate, terete to moderately laterally compressed;

florets 5-6, bases concealed at maturity;

rachilla internodes 1-1.5 mm, concealed at maturity.

15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 4-9 florets.

smooth to scabrous;

lower glumes 4-6 mm, (3)5-veined;

upper glumes 4-7 mm, 7-veined;

lemmas 6.5-8 mm long, 3-4.5 mm wide, elliptic to lanceolate, coriaceous, backs smooth, distinctly 7(9)-veined, not ribbed, rounded over the midvein, margins scabrous, rounded, not inrolled at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm;

awns 5-9 mm, all more or less equal in length, straight, arising less than 1.5 mm below the lemma apices;

anthers 1.5-3 mm.

pubescent or glabrous;

lower glumes 4-7.5 mm, 1(3)-veined;

upper glumes 6-9 mm, 3-veined, sometimes mucronate;

lemmas 8-14 mm, elliptic to lanceolate, rounded over the midvein, backs glabrous or pilose to pubescent, margins long-pilose, apices obtuse to acute, entire;

awns 3-4.5(7) mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-3 mm.

shorter than the paleas, thin, weakly inrolled or flat.

sheaths densely hairy, hairs stiff, often retrorse;

upper sheaths glabrous or pubescent;

ligules 1-2 mm, glabrous or hairy, erose;

blades 7-18 cm long, 1-4 mm wide, pilose on both surfaces.

= 28.

= 14.