Flora of North America species comparison

30-60 cm, slender.

(9)20-40 cm, erect or ascending.

pilose-pubescent to nearly glabrous;

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

sparsely pubescent or glabrous;

ligules 0.8-1.5 mm, glabrous or hairy, obtuse;

blades 5-20 cm long, 2-5 mm wide, abaxial surfaces glabrous, adaxial surfaces pilose.

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

branches appressed to spreading, sometimes flexuous.

2-7 cm long, 1-4 cm wide, erect, dense, obovoid, wedge-shaped at the base, sometimes interrupted;

branches shorter than the spikelets, erect, straight or almost so, sometimes verticillate.

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

12-25 mm, lanceolate, crowded, terete to moderately laterally compressed;

florets 5-10, bases concealed at maturity;

rachilla internodes concealed 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 to pubescent;

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

upper glumes 5-7 mm, 5-7-veined;

lemmas 7-10 mm long, 1.5-2 mm wide, lanceolate, glabrous, obscurely 7-veined, rounded over the midvein, margins rounded, not inrolled at maturity, apices sharply acute, bifid, teeth shorter than 1 mm;

awns 7-10 mm, flattened at the base, divaricate or recurved when mature, arising 1.5 mm or more below the lemma apices;

anthers 0.3-0.5 mm.

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

= unknown.

= 14.