Flora of North America species comparison

60-140 cm;

nodes glabrous or retrorsely pubescent.

30-130 cm, erect to slightly decumbent;

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

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, 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.

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.

(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.

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.

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.

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.

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.

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

= 28.

= 28.