Flora of North America species comparison

20-110 cm, erect or ascending.

20-70 cm tall, to 3 mm thick, sometimes geniculate at the base.

usually smooth or scabridulous, sometimes slightly pubescent distally, not pilose at the throat;

auricles absent;

ligules 1-6 mm, densely hairy to ciliolate, acute to obtuse, erose;

blades 6-13 cm long, 6-8 mm wide, flat, both surfaces glabrous, sometimes scabrous.

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

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

9-20 cm long, 2-2.5 cm wide, dense;

lower branches shorter than 10 cm, 2-4 per node, erect, with 1-2 spikelets variously distributed.

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.

20-40 mm, usually longer than the branches and pedicels, elliptic to lanceolate, strongly laterally compressed, crowded, overlapping, with 3-7 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;

lower glumes 8-12 mm, (3)5(7)-veined;

upper glumes 10-13 mm, 7(9)-veined, shorter than the lowest lemma;

lemmas 12-14 mm, lanceolate, laterally compressed, distinctly 9-11-veined, strongly keeled at least distally, more or less uniformly hairy, often with bronze hyaline margins, apices entire or with acute teeth shorter than 1 mm;

awns (2)4-7 mm;

anthers 2-4 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.

= 56.