Flora of North America species comparison

30-60 cm, slender.

(22)30-70 cm, erect or ascending.

pilose-pubescent to nearly glabrous;

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

usually densely pilose;

upper sheaths sometimes pubescent or glabrous;

ligules 1-2.2 mm, pilose, obtuse, lacerate;

blades 10-20 cm long, 2-4 mm wide, usually pilose on both surfaces.

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

branches appressed to spreading, sometimes flexuous.

10-22 cm long, 4-13 cm wide, open, nodding;

branches usually longer than the spikelets, ascending to spreading or somewhat drooping, slender, flexuous, sometimes sinuous, often with more than 1 spikelet.

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

20-40 mm, lanceolate, terete to moderately laterally compressed;

florets 6-12, 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.

smooth or scabrous;

lower glumes 4.5-7 mm, (3)5-veined;

upper glumes 5-8 mm, 7-veined;

lemmas 7-9 mm long, 1.2-2.2 mm wide, lanceolate, coriaceous, smooth proximally, scabrous on the distal 1/2, obscurely (7)9-veined, rounded over the midvein, margins hyaline, 0.3-0.6 mm wide, obtusely angled above the middle, not inrolled at maturity, apices acute, bifid, teeth shorter than 1 mm;

awns 8-13 mm, strongly divergent at maturity, sometimes erect, twisted, flattened at the base, arising 1.5 mm or more below the lemma apices;

anthers 1-1.5 mm.

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

= unknown.

= 14.