Flora of North America species comparison

30-130 cm, erect to slightly decumbent;

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

usually (40)60-100(120) cm, erect or the bases somewhat decumbent;

nodes 4-8, 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 usually glabrous, occasionally hirsute;

auricles 0-2 mm, pale or reddish brown;

ligules to 1 mm;

blades 3-9 mm wide, lax, pale green, adaxial surfaces densely short-pilose, hispidulous, or scabridulous, especially on the veins.

(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.

5-20 cm long, 2-5 cm wide, erect to slightly nodding, with 2 spikelets per node;

internodes (5)8-14 mm long, 0.2-0.3 mm thick at the thinnest sections, without pronounced dorsal angles, often with green lateral bands, glabrous beneath the spikelets.

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.

(6)9-15(22) mm, somewhat to strongly divergent, with 2-5 florets, lowest florets functional;

disarticulation above the glumes and 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.

subequal, 15-30 mm including the weakly differentiated awns, the basal 0-1 mm subterete and indurate, glume bodies, when distinguishable, about 6-10 mm long, (0.2)0.3-0.5(0.7) mm wide, linear-setiform to setaceous, entire, widening or parallel-sided above the base, 1-3-veined, glabrous or scabridulous, margins firm, awns straight or flexuous;

lemmas 7-10 mm, smooth or scabridulous, occasionally hirtellous especially near the margins, awns 15-22 mm, straight to moderately outcurving;

paleas 6-9 mm, obtuse or narrowly truncate, sometimes emarginate;

anthers 2-4.5 mm.

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

May to July.

= 28.

= 28.