Flora of North America species comparison

30-60 cm, slender.

80-110 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.

11-30 cm long, 4-20 cm wide, open, erect or nodding;

branches usually longer than the spikelets, ascending to widely spreading, slender, slightly curved or straight.

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

10-25 mm, lanceolate, terete to moderately laterally compressed, often purple-tinged;

florets 4-10, bases concealed or visible at maturity;

rachilla internodes concealed or 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.

glabrous;

lower glumes 4-6 mm, 3-veined;

upper glumes 5-8 mm, 5-veined;

lemmas 7-9 mm long, 1.1-1.5 mm wide, lanceolate, obscurely 7-veined, rounded over the midvein, glabrous, coriaceous, margins slightly angled, inrolled or not at maturity, apices acute, bifid, teeth shorter than 1 mm;

awns 6-11 mm, straight, arising at varying distances below the lemma apices;

anthers 2.5-5 mm.

shorter than the paleas, weakly to strongly inrolled.

sheaths with dense, soft, appressed hairs;

ligules 1-1.5 mm, hairy, obtuse, erose;

blades 10-20 cm long, 2-6 mm wide, coarsely pilose on both surfaces.

= unknown.

= 14.