Flora of North America species comparison

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

nodes glabrous.

25-100 cm tall, 1.3-3.5 mm thick, erect;

nodes 4-6, 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.

basal and cauline;

sheaths glaucous, glabrous or with hairs, margins glabrous or ciliate distally;

auricles 1-2 mm;

ligules 0.2-0.7 mm, truncate;

blades 3-10 mm wide, flattish, often glaucous.

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.

(6.5)10-25 cm long, 1.4-4 cm wide including the awns, 0.7-20 cm wide excluding the awns, flexuous, nodding;

rachises densely to sparsely hirsute on the edges, hairs about 0.2 mm, glabrous elsewhere, glaucous;

internodes (5)8-20 mm.

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.

15-25 mm, loosely appressed or ascending, with 5-10 florets;

rachillas hairy, hairs about 0.1 mm;

disarticulation above the glumes, beneath the florets.

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.

lanceolate, tapering from about midlength, adaxial surfaces glabrous, hyaline margins about 0.1 mm wide, strongly keeled distally, midvein scabrous distally, other veins smooth or scabrous, apices acute to acuminate, sometimes awned, awns 2-5 mm;

lower glumes 4-7 mm, 3-5-veined;

upper glumes 5-8 mm, 5-veined;

calluses glabrous;

lemmas 8-12 mm, lanceolate, glabrous or pilose, apices acute, awned, awns 20-40 mm, straight or flexuous;

paleas from slightly shorter than to longer than the lemmas, keels narrowly winged distally, not or scarcely extending beyond the intercostal region, distinctly outwardly curved below the apices, apices 0.3-0.5 mm wide;

anthers 1.5-2.5 mm.

= 28.

= 42.