Flora of North America species comparison

15-35(55) cm, prostrate to strongly decumbent, at least at the base;

nodes glabrous.

70-160 cm, erect;

nodes 4-9, mostly exposed, glabrous.

glabrous or shortly pilose;

auricles usually present, 0.5-1 mm;

ligules 0.2-0.4(0.7) mm, usually truncate, occasionally acute, entire to erose;

blades 1.5-4 mm wide, usually involute, adaxial surfaces prominently ribbed.

evenly distributed;

sheaths glabrous, often purplish;

auricles 1-2 mm, purplish or brownish black;

ligules usually 1-2 mm;

blades 5-17 mm wide, lax, adaxial surfaces usually pilose, at least on the veins, occasionally scabrous.

3.5-10 cm long, 0.8-1.2 cm wide excluding the awns, 3-6 cm wide including the awns, usually with 1 spikelet per node, occasionally with 2 spikelets at the lower nodes;

internodes 2.5-5(7) mm long, 0.5-1 mm wide, glabrous, mostly smooth, edges scabrous.

8-28 cm long, 3-5 cm wide, nodding to pendent, with 2 spikelets per node, rarely with 1 or 3 at a few nodes;

internodes 4-6(9) mm long, 0.2-0.3 mm thick at the thinnest sections, margins and summits often pubescent.

9-15 mm long, 6-12 mm wide, appressed to ascending, with 3-6 florets;

rachilla internodes 0.8-1.3 mm, scabridulous;

disarticulation initially at the rachis nodes, subsequently beneath each floret.

10-16 mm, appressed, with 2-4(5) florets, lowest florets functional;

disarticulation above the glumes, beneath each floret.

4-9 mm long, 0.5-1 mm wide, mostly glabrous, midveins scabrous, 3-5-veined, entire, tapering into a divergent, 12-30 mm awn;

lemmas 7-10 mm, usually glabrous, occasionally scabridulous, awned, awns 15-30 mm, divergent, scabridulous;

paleas usually longer than the lemmas, apices ciliate, truncate or the veins extending into teeth, teeth about 0.5 mm;

anthers 1-1.6 mm.

usually differing in length by at least (3)4 mm, occasionally obsolete, (1)2-15(20) mm long including the undifferentiated awns, indurate at the base, (0.1)0.2-0.4(0.6) mm wide, setaceous, 0-1-veined, tapering from the base, scabrous or hispidulous at least towards the apices, margins firm, awns often outcurving;

lemmas 7-12 mm, usually silvery-hirsute to sericeous, occasionally hirtellous or strigose, at least near the margins, backs sometimes scabrous, awns 18-35 mm, moderately to strongly outcurving at maturity;

paleas 7-10 mm, obtuse, occasionally emarginate;

anthers 2-4 mm.

from early June to late July.

= 28.

= 28.