Flora of North America species comparison

60-80 (150) cm, initially prostrate, usually becoming erect.

50-80 cm, erect.

of the basal leaves pilose, upper sheaths usually glabrous;

ligules 1-6 mm, obtuse;

blades 6-30 cm long, 2-20 mm wide, glabrous or pilose.

glabrous or sparsely pubescent, hairs 0.5-1 mm, sometimes confined to the margins;

ligules of the lower leaves 3-5 mm, those of the upper leaves 1.5-2.5 mm, acute;

blades 12-25 cm long, 5-11 mm wide.

15-35.5 (50) cm long, 6-12 cm wide, erect or nodding.

15-26 cm.

21-30 mm, with 2-3 florets;

disarticulation beneath each floret;

disarticulation scars elliptic to triangular.

30-40 mm, with 3-4(5) florets;

disarticulation beneath each floret;

disarticulation scars of the lower florets in a spikelet round to elliptic, those of the third and fourth florets heart-shaped.

subequal, 15-30 mm, 7-9-veined;

calluses bearded, hairs 2-3 mm;

lemmas 15-26 mm, densely strigose below midlength, apices acute, biaristate, 2 veins extending 2-4 mm beyond the apices, awns 30-45 mm, arising about midlength, geniculate;

lodicules narrowly triangular, without lobes on the wings;

anthers 2.5-4 mm.

subequal, 28-40 mm, 7-9-veined;

calluses bearded, hairs 3-5 mm;

lemmas 14-26 mm, usually densely strigose below midlength, sometimes sparsely strigose or glabrous, veins not extending beyond the apices, apices bifid, teeth sometimes shortly aristate, awns arising at midlength;

lodicules without lobes on the wing;

anthers 2-3.2 mm.

= 28.

= 42.