Flora of North America species comparison

100-180(220) cm, erect;

nodes 9-16, mostly concealed by the leaf sheaths, glabrous.

30-130 cm, erect to slightly decumbent;

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

evenly distributed;

sheaths usually glabrous, occasionally villous, often reddish brown;

auricles 1-3 mm, brown;

ligules to 1 mm;

blades (8)10-20(24) mm wide, flat, lax, dark green, adaxial surfaces usually thinly pilose, with weakly spreading hairs on the veins at least near the margins, sometimes villous or 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.

10-30 cm long, 3-5 cm wide, pendent, the bases often barely exserted, with 2 spikelets per node;

internodes 5-8(12) mm long, 0.2-0.3 mm thick at the thinnest sections, usually pubescent beneath the spikelets.

(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.

12-20 mm, divergent, with (3)4-6(7) florets, lowest florets functional;

disarticulation above the glumes and beneath each floret.

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.

equal or subequal, 12-30 mm including the often undifferentiated awns, the basal 0.5-1 mm subterete and slightly indurate, glume bodies 7-12 mm long, (0.2)0.4-0.9(1.1) mm wide, linear-setiform, entire, widening or parallel-sided above the base, 1-3(5)-veined, glabrous, hispidulous or villous, especially near the margins, margins firm, awns (5)8-15(18) mm, straight or flexuous;

lemmas 10-15 mm, usually uniformly appressed-villous, rarely scabrous-hirtellous or glabrous, awns 15-25(30) mm, moderately to strongly outcurving;

paleas 9-14 mm, narrowly truncate, minutely bidentate;

anthers 2-3.5 mm.

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.

from mid-July to early August.

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

= 28.

= 28.