Flora of North America species comparison

50-140 cm, usually erect, occasionally geniculate below;

nodes 4-8, exposed or concealed, glabrous.

45-135 cm, erect or geniculately ascending, glabrous.

glabrous or villous;

auricles to 1.5 mm;

ligules 0.5-1.5 mm, truncate;

blades 15-30 cm long, 4-12 mm wide, sometimes villous, adaxial surfaces smooth or scabrous, primary and secondary veins alternating.

evenly distributed;

sheaths usually glabrous, occasionally pilose, often purplish;

auricles usually present, 0.5-3 mm, brown to black;

ligules 1-2(3) mm;

blades 4-16 mm wide, lax, usually deep glossy green, adaxial surfaces pilose or scabridulous.

7-20 cm long, 4-7 cm wide, more or less erect, usually with 2 spikelets per node, rarely with 3 at some nodes;

internodes (3)4-8(10) mm long, (0.1)0.2-0.3(0.4) mm thick at the thinnest sections, flexuous, usually glabrous, sometimes scabrous or hirsute, usually with green lateral bands.

8-30 cm long, 1-2 cm wide including the awns, 0.5-1 cm wide excluding the awns, erect or nodding, usually with 1 spikelet per node, sometimes with 2 spikelets at the lower nodes;

internodes 10-20 mm long, about 0.8 mm wide, scabrous on the margins and on the surfaces, marginal prickles larger than those on the surfaces, hirtellous just below the spikelets.

10-18 mm, strongly divergent to patent at maturity, with (1)2-4(6) florets, lowest florets functional;

disarticulation above the glumes, beneath each floret.

16-30 mm, loosely appressed, with 6-8 florets;

rachilla internodes about 0.8 mm, strigose, hairs to about 0.3 mm;

disarticulation above the glumes, beneath each floret.

usually vestigial, sometimes 1-3 mm long, about 0.1 mm wide, subulate, entire, with no evident veins, occasionally to 10(20) mm long including the undifferentiated awns and differing in length by more than 5 mm, 0.1-0.2 mm wide, setaceous, tapering from the base, usually glabrous, occasionally appressed-puberulent to strigose, sometimes scabrous, usually straight, rarely somewhat curving, margins firm;

lemmas 8-11 mm, usually glabrous, occasionally appressed-puberulent to strigose, especially near the margins and apices, awns (12)20-40(47) mm, usually straight, rarely somewhat curving;

paleas 7-11 mm, obtuse or truncate, occasionally emarginate;

anthers 2.5-5 mm.

subequal, 10-18 mm long, 1.1-2 mm wide, elliptic-lanceolate, green, not keeled, 5-7-veined, veins more or less equally prominent, scabrous, apices acute to acuminate;

lemmas 10-14 mm, scabrous or puberulent dorsally, awned, awns (4)12-18 mm, straight;

paleas 3/4 as long as to slightly shorter than the lemmas, keels outwardly curved below the apices, apices 0.3-0.7 mm wide, truncate;

anthers 3-6 mm.

mid-June to early July.

= 28.

= 28.