Flora of North America species comparison

5-90 cm, erect, slender, puberulent below the panicle.

10-40 cm, erect or ascending.

usually densely and softly retrorsely pubescent to pilose, upper sheaths sometimes glabrous;

auricles absent;

ligules 2-3 mm, glabrous, obtuse, lacerate;

blades to 16 cm long, 1-6 mm wide, both surfaces softly hairy.

5-20 cm long, 3-8 cm wide, open, lax, drooping distally, usually 1-sided;

branches 1-4 cm, drooping, usually 1-sided and longer than the spikelets, usually at least 1 branch with 4-8 spikelets.

6-15 cm long, 1-2 cm wide, racemose, dense, strongly contracted, stiffly erect;

branches shorter than the spikelets, stiff, erect, straight.

10-20 mm, usually shorter than the panicle branches, sides parallel or diverging distally, moderately laterally compressed, often purplish-tinged, not densely crowded, with 4-8 florets.

17-45 mm long, 4-7 mm wide, narrowly oblong or lanceolate, terete to moderately laterally compressed, usually 1 per node;

florets (4)8-12, bases concealed at maturity;

rachilla internodes concealed at maturity.

villous, pubescent, or glabrous, margins hyaline;

lower glumes 4-9 mm, 1-veined;

upper glumes 7-13 mm, 3-5-veined;

lemmas 9-12 mm, lanceolate, glabrous or pubescent to pilose, 5-7-veined, rounded over the midvein, margins hyaline, often with some hairs longer than those on the backs, apices acuminate, hyaline, bifid, teeth 0.8-2(3) mm;

awns 10-18 mm, straight, arising 1.5 mm or more below the lemma apices;

anthers 0.5-1 mm.

glabrous or puberulent;

lower glumes 7-9 mm, 3-veined, upper glumes 8-11 mm, 5-7-veined;

lemmas 11-15(17) mm long, 3-5 mm wide, lanceolate, glabrous or pubescent, 9-veined, rounded over the midvein, margins bluntly angled, not inrolled at maturity, apices and teeth acuminate, teeth shorter than 1 mm;

awns 12-20 mm, strongly divaricate at maturity, flattened and often basally twisted, arising 1.5 mm or more below the lemma apices;

anthers 0.75-1.5 mm.

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

sheaths densely retrorsely villous-pubescent, upper sheaths glabrous;

ligules 0.5-1 mm, glabrous, truncate, dentate or lacerate;

blades 5-20 cm long, 1.5-4 mm wide, pilose, sparingly pubescent, or subglabrous.

= 14.

= 14, 28.