Flora of North America species comparison

20-110 cm, erect or ascending.

50-100(110) cm, usually erect, sometimes decumbent at the base;

nodes 3-5, pubescent, puberulent, or glabrous;

internodes puberulent or glabrous.

and throats pilose or glabrous;

auricles absent;

ligules 0.5-1 mm, glabrous, truncate, erose;

blades 10-17 cm long, 5-10 mm wide, flat, with prow-shaped tips, both surfaces glabrous or pilose or only the adaxial surfaces pilose.

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

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

8-13 cm, open, drooping;

branches ascending to spreading, flexuous.

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.

15-25 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 7-11 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, margins often hyaline;

lower glumes 5-7.5 mm, 3-veined;

upper glumes 6.5-8.5 mm, 5-veined;

lemmas 7-11 mm, elliptic to lanceolate, rounded over the midvein, backs more or less uniformly pilose or pubescent, margins densely long-pilose, apices acute to obtuse, entire;

awns 1.5-3 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 1.5-2.5 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.