Flora of North America species comparison

60-120 cm, erect or spreading;

nodes (3)4-6(7), usually pilose;

internodes glabrous.

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

pilose or glabrous;

auricles absent;

ligules 2-6 mm, glabrous, obtuse or truncate, erose or lacerate;

blades 13-25(33) cm long, to 14 mm wide, flat, abaxial surfaces usually glabrous, sometimes pilose, adaxial surfaces usually pilose, sometimes 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.

10-15 cm, open;

branches ascending to drooping.

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.

15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (3)4-9 florets.

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

florets 6-12, bases concealed at maturity;

rachilla internodes concealed at maturity.

glabrous or pilose;

lower glumes 5-8 mm, 1(3)-veined;

upper glumes 8-12 mm, 3-veined;

lemmas 8-15 mm, lanceolate, rounded over the midvein, backs sparsely hairy or glabrous, margins usually coarsely pubescent, sometimes glabrous, apices subulate to acute, entire;

awns (4)6-12 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-4 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.

= 14.

= 14.