Flora of North America species comparison

60-140 cm;

nodes glabrous or retrorsely pubescent.

40-140 cm, usually somewhat decumbent;

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

evenly distributed;

sheaths glabrous or pubescent;

auricles usually present, 0.5-2 mm;

ligules 0.3-3.5 mm, truncate to acute, sometimes long-ciliate;

blades 4-6.5 mm wide, flat or the margins involute, straight.

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.

15-31 cm long, 0.4-1.5 cm wide including the awns, 0.4-0.8 cm wide excluding the awns, erect, with 1 spikelet per node;

internodes 9-27 mm long, 1-1.3 mm wide, glabrous, smooth.

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.

13-29 mm long, from shorter than to almost twice as long as the internodes, 2.5-5 mm wide, appressed, with 5-7 florets;

rachillas glabrous;

disarticulation above the glumes and 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.

subequal, 7.5-12 mm long, 1.2-1.5 mm wide, lanceolate, widest at about mid-length, flat or rounded on the back, 5-veined, veins smooth, scabrous or just the midvein scabridulous, margins widest at about midlength, apices acute, unawned;

lemmas 9-12 mm, glabrous, sometimes scabrous, acute, unawned or awned, awns to 28 mm, straight;

paleas subequal to the lemmas, tapering, apices 0.2-0.3 mm wide;

anthers (3.5)4-7 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.