Flora of North America species comparison

30-60 cm, slender.

20-80 (120) cm, erect.

pilose-pubescent to nearly glabrous;

blades 7-28 cm long, 2-9 mm wide, pilose or glabrous.

10-20 cm long, 3-9 cm wide, erect, dense;

branches appressed to spreading, sometimes flexuous.

5-23 cm long, 2.5-12 cm wide, open, nodding;

branches spreading to ascending;

lower branches slightly drooping, often secund after anthesis, not sinuous.

15-20 mm, elliptic to lanceolate, more or less terete, with 3-9 florets.

10-20 mm, shorter than at least some panicle branches, ovoid-lanceolate or ovate, laterally compressed, not purple-tinged;

florets 4-9(10), ascending-spreading after flowering, bases visible at maturity;

rachilla internodes visible at maturity.

glabrous, acuminate;

lower glumes 8-10 mm, 1-veined;

upper glumes 12-16 mm, 3(5)-veined;

lemmas 11-14 mm, lanceolate to linear-lanceolate, sparsely pubescent, 5-veined, rounded over the midvein, apices acuminate, bifid, teeth 2-3 mm, usually aristate, sometimes acuminate;

awns 13-20 mm, geniculate, strongly to moderately twisted in the basal portion, arising 1.5 mm or more below the lemma apices;

anthers 2-2.5 mm.

scabrous or glabrous;

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

upper glumes 6-7 mm, 7-veined;

lemmas 6.5-8.5(10) mm long, 1.7-2.5 mm wide, elliptic, coriaceous, obscurely 7-veined, rounded over the midvein, backs usually glabrous, sometimes pubescent, scabrous to puberulent on the margins and near the apices, margins evenly rounded, inrolled at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm;

awns (0)3-6(9.5) mm, straight or flexuous, arising less than 1.5 mm below the lemma apices;

anthers 1-2 mm.

equaling the paleas, thick, strongly inrolled at maturity.

sheaths glabrous or loosely pubescent and glabrate;

ligules 2-3 mm, glabrous, obtuse;

blades 15-30 cm long, 2-4 mm wide, abaxial surfaces pilose or glabrous, adaxial surfaces pilose.

= unknown.

= 28.