Flora of North America species comparison

30-130 cm, erect to slightly decumbent;

nodes 4-9, concealed or exposed, usually glabrous, rarely pubescent.

40-150 cm, erect or slightly geniculate at the base;

nodes 6-9, usually exposed, glabrous.

evenly distributed;

sheaths usually glabrous, rarely hirsute, occasionally reddish or purplish;

auricles absent or to 1.8 mm, pale brown;

ligules shorter than 1 mm;

blades 2-14(18) mm wide, usually spreading or lax, sometimes becoming involute, basal blades similar to the upper blades, adaxial surfaces usually smooth, sometimes scabridulous, usually glabrous, occasionally pubescent.

evenly distributed;

sheaths glabrous or hirsute, often purplish;

auricles to 1 mm, often absent;

ligules to 1 mm;

blades (3)5-14(16) mm wide, lax, adaxial surfaces usually pilose to hirsute on the veins, sometimes scabrous or smooth.

(3)4-16(22) cm long, 1-2.2(2.5) cm wide, erect, the bases often sheathed, with 2 spikelets per node, rarely with 3 at some nodes;

internodes 3-5 mm long, 0.25-0.5 thick at the thinnest sections, smooth and glabrous, or scabrous, or with hairs beneath the spikelets.

7-30 cm long, 2-5 cm wide, flexuous, nodding to pendent, with (1)2(3-4) spikelets per node, solitary spikelets usually basal or distal, rarely occurring throughout;

internodes 5-10 mm long, 0.2-0.7 mm thick at the thinnest sections, mostly glabrous, sometimes scabrous below the spikelets, angles ciliate.

10-15 mm, appressed to slightly divergent, with (2)3-4(6) florets, lowest florets functional;

disarticulation below the glumes and each floret, or the lowest floret falling with the glumes.

10-18 mm, appressed to divergent, usually becoming purplish, with (3)4-5(7) florets, lowest florets functional;

disarticulation above the glumes, beneath each floret.

subequal or equal, the basal 1-4 mm terete, indurate, without evident venation, bowed out, yellowish, glume bodies 7-15 mm long, (0.5)0.7-2.3 mm wide, linear-lanceolate, widening above the base, 3-5(8)-veined, usually smooth or scabridulous, margins firm, awns 3-10(15) mm, straight;

lemmas 6-10 mm, scabridulous, glabrous or villous-hirsute, awns (5)8-20(25) mm, straight;

paleas 5-9 mm, obtuse;

anthers 2-3.5(4) mm.

equal or subequal, the bases flat, evidently veined, not indurate, glume bodies 3-8 mm long, 0.4-1(1.2) mm wide, linear-lanceolate to subsetaceous, entire, widening or parallel-sided above the base, 3(5)-veined, veins smooth or scabrous, margins hyaline or scarious, awns 1-6 mm, straight;

lemmas 8-13 mm, densely scabridulous to scabrous, at least along the outer veins, awns 10-25 mm, usually somewhat outcurving from near the base;

paleas 8-12 mm, keels spinose-ciliate, bidentate, apices acute, 0.15-0.3 mm wide between the veins;

anthers 0.9-1.7 mm.

usually mid-June to late July (mid-August).

from June to July.

= 28.

= 28.