Flora of North America species comparison

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

nodes glabrous.

40-140 cm, usually somewhat decumbent;

nodes 4-7, mostly exposed, usually glabrous, occasionally puberulent.

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 and smooth, occasionally scabridulous or retrorsely hairy, sometimes purplish;

auricles to 1.5 mm, often absent;

ligules to 1 mm;

blades 4-12 mm wide, lax, usually deep green, adaxial surfaces usually pilose or villous, occasionally puberulent or scabridulous.

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.

6-20 cm long, 0.5-2 cm wide, nodding to pendent, with 2 spikelets per node, rarely with 3 at some nodes;

internodes 3-10(12) mm long, 0.2-0.7 mm thick at the thinnest sections, usually glabrous, sometimes sparsely hairy.

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.

12-20 mm, appressed to divergent, sometimes purplish at higher latitudes, with 2-4(7) florets, lowest florets functional;

disarticulation above the glumes and 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.

equal or subequal, the bases flat, occasionally indurate for 0.5 mm, veins usually evident, glume bodies (4.5)7-10(11) mm long, 0.7-1.5 mm wide, linear-lanceolate, entire, widening or parallel-sided above the base, 3-5-veined, usually scabridulous to scabrous, veins occasionally hirsute beyond midlength, margins hyaline or scarious, awns 1-10 mm, straight;

lemmas 7-14 mm, smooth or scabridulous, lateral veins hairy, margins hairy beyond midlength, marginal hairs 0.5-1 mm, longer than those elsewhere, awns (2)8-30 mm, flexuous to moderately outcurving;

paleas 6-13 mm, with hairs of varying lengths on the keels and apices, acute, bidentate;

anthers 2-3.5 mm.

from May to July.

= 28.

= 28.