Flora of North America species comparison

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

nodes glabrous.

50-120 cm, erect;

nodes 4-8, exposed or concealed, often reddish brown or blackish, 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 usually glabrous, sometimes pubescent at the summit;

auricles 1-2 mm, often reddish brown or blackish;

ligules to 1 mm, often reddish brown;

blades 3-11 mm wide, lax, adaxial surfaces glabrous or short-pilose.

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.

10-18 cm long, 3-5 cm wide, slightly nodding, with 2 spikelets per node;

internodes (5)7-13(18) mm long, about 0.2 mm thick at the thinnest sections, flexuous, with green lateral bands, glabrous except the dorsal angles hispid.

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.

10-15 mm, usually appressed, with 3(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.

often differing in length by more than 5 mm, sometimes vestigial to absent from the upper spikelets or throughout, 0-15(20) mm long including the undifferentiated awns, indurate at the base, 0.1-0.3 mm wide, setaceous to subulate, entire, 0-1-veined, glabrous, margins firm, awns often outcurving;

lemmas 8-10 mm, usually hairy, occasionally glabrous, awns (10)20-30(35) mm, slightly to strongly outcurving at maturity;

paleas 7-9 mm, obtuse to truncate, sometimes emarginate;

anthers 2.5-3 mm, evident in June.

= 28.

= unknown.