Flora of North America species comparison

100-180(220) cm, erect;

nodes 9-16, mostly concealed by the leaf sheaths, glabrous.

30-130 cm tall, 1-5 mm thick, erect or weakly decumbent;

nodes 3-4, glabrous, glaucous.

evenly distributed;

sheaths usually glabrous, occasionally villous, often reddish brown;

auricles 1-3 mm, brown;

ligules to 1 mm;

blades (8)10-20(24) mm wide, flat, lax, dark green, adaxial surfaces usually thinly pilose, with weakly spreading hairs on the veins at least near the margins, sometimes villous or glabrous.

basal and cauline;

sheaths glaucous, glabrous or with hairs, lower sheaths sometimes hairy, upper sheaths glabrous, margins sometimes ciliate;

auricles 1.5-2.5 mm;

ligules about 0.3 mm;

blades 10-25 cm long, 3-10 mm wide, glabrous or pilose.

10-30 cm long, 3-5 cm wide, pendent, the bases often barely exserted, with 2 spikelets per node;

internodes 5-8(12) mm long, 0.2-0.3 mm thick at the thinnest sections, usually pubescent beneath the spikelets.

10-22 cm long, 1.5-2.5 cm wide including the awns, 0.8-1 cm wide excluding the awns, inclined to nodding, with 1 spikelet at all or most nodes;

rachises scabrous on the edges, glabrous below the spikelets;

internodes 10-25 mm.

12-20 mm, divergent, with (3)4-6(7) florets, lowest florets functional;

disarticulation above the glumes and beneath each floret.

5-22 mm long, about 5 mm wide, appressed, with 4-12 florets;

disarticulation above the glumes, beneath the florets.

equal or subequal, 12-30 mm including the often undifferentiated awns, the basal 0.5-1 mm subterete and slightly indurate, glume bodies 7-12 mm long, (0.2)0.4-0.9(1.1) mm wide, linear-setiform, entire, widening or parallel-sided above the base, 1-3(5)-veined, glabrous, hispidulous or villous, especially near the margins, margins firm, awns (5)8-15(18) mm, straight or flexuous;

lemmas 10-15 mm, usually uniformly appressed-villous, rarely scabrous-hirtellous or glabrous, awns 15-25(30) mm, moderately to strongly outcurving;

paleas 9-14 mm, narrowly truncate, minutely bidentate;

anthers 2-3.5 mm.

narrowly elliptic to lance-oblong, apices acute to acuminate;

lower glumes 5-11 mm;

upper glumes 7-13 mm;

lemmas 7-12 mm, mostly glabrous, glabrate, or sparsely hairy, margins with coarse stiff hairs, hairs to 1 mm, apices abruptly narrowed, awned, awns 10-20 mm, scabrous, strongly outcurved to recurved;

paleas 2/3 - 4/5 the length of the lemmas, keels winged distally, distinctly outwardly curved below the apices, apices 0.5-0.6 mm wide, truncate to rounded;

anthers about 2 mm.

from mid-July to early August.

StY.

= 28.

= 28.