Flora of North America species comparison

20-62 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.

densely pilose;

ligules 0.5-2 mm, hairy, obtuse, erose;

blades 3-13 cm long, 2-4 mm wide, pilose to pubescent on both surfaces.

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.

5-15 cm long, 3-7 cm wide, open, secund, nodding;

branches sometimes longer than the spikelets, curved to reflexed.

10-22 cm, open, nodding;

branches spreading to ascending.

15-27 mm long, 8-12 mm wide, ovate, laterally compressed;

florets 7-15, bases concealed at maturity;

rachilla internodes concealed at maturity.

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

smooth or scabridulous;

lower glumes 5-6 mm, 3-5-veined;

upper glumes 6-8 mm, 7-9-veined;

lemmas 9-10 mm long, 6-8 mm wide, inflated, obovate or rhombic, coriaceous, smooth or scabridulous, obscurely 9-veined, rounded over the midvein, margins hyaline, 1-1.3 mm wide, abruptly angled, not inrolled at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm;

awns usually absent, sometimes to 1 mm, arising less than 1.5 mm below the lemma apices;

anthers 0.7-1 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.

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

= 14.

= 14.