Flora of North America species comparison

(30)50-110 cm, clumped, erect, glabrous or pubescent.

(20)40-80(100) cm, erect, smooth or scabridulous.

2-3 per culm;

sheaths scabridulous or pilose;

ligules 1.5-3 mm, truncate, erose to lacerate;

blades (8.5)15-20+ cm long, (3)7-12 mm wide, flat, ascending, lax at maturity, often scabridulous.

concentrated below midlength on the culms;

sheaths glabrous or pilose;

ligules 1.5-3.5 mm, rounded or truncate;

blades 10-20+ cm long, 2-9 mm wide, flat, lax.

10-30 cm long, (1)2-9 cm wide, open, nodding, green or tan, occasionally purple-tinged;

branches 2-12+ cm, most, except sometimes the uppermost, spikelet-bearing only towards the apices, with the basal (1/5)1/3-1/2 bare, filiform, flexuous, at least the lowest 1-3 whorls spreading or drooping.

8-20 cm long, usually 2-4 cm wide, lax, nodding, silvery-green or tan;

lower branches to 5 cm, ascending, naked below, the spikelets imbricate distally.

6-12 mm, subsessile to pedicellate, pedicels to 2 cm, usually with 2-3 functional florets below 1-2 reduced florets;

rachilla internodes and hairs 1-2.5 mm;

disarticulation above the glumes, beneath the florets.

5-7(9) mm, pedicellate, lance-ovate, with 2(4) florets;

rachilla internodes and hairs 1.3-2 mm.

unequal;

lower glumes 0.75-2(3) mm, subulate;

upper glumes 3.5-5 mm long, shorter than the lowest florets, 2-3 times as wide as the lower glumes, widest at or above the middle, ovate or obovate, rounded to the acuminate apices;

callus hairs to 1 mm;

lemmas 5-6 mm, broadly lanceolate, glabrous, bifid, teeth to 1.3 mm, awned, awns (7)9-14 mm, arising from above midlength to just below the teeth, exceeding the lemma apices, arcuate to flexuous;

paleas shorter than the lemmas;

anthers about 1 mm.

unequal, widest at or below the middle;

lower glumes 4-5.5 mm;

upper glumes 5-7 mm long, nearly as long as the florets, wider than the lower glumes;

callus hairs 1.5-2 mm;

lemmas 5-6 mm, smooth or scabridulous, apices usually minutely bifid, sometimes entire, unawned or awned.

2.5-3.2 mm, densely to sparsely pubescent.

about 3 mm, sparsely pubescent distally.

to 2 mm, arising just below and rarely exceeding the apices;

paleas shorter than the lemmas;

anthers 0.6-0.8 mm.

= 42.

= 14.