Flora of North America species comparison

15-65 cm, erect to ascending, usually puberulent;

nodes 4-6, mostly 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 glabrous or white-villous;

auricles usually present, 0.5-1.5 mm;

ligules to 1 mm, truncate, entire or lacerate;

blades 1.5-4(5) mm wide, often ascending and involute, adaxial surfaces scabrous, pilose, or villous.

5-20 cm long, 5-15 cm wide, erect, sometimes partially enclosed at the base, with 2 spikelets per node, rarely with 3-4 at some nodes;

internodes 3-5(8) mm long, 0.1-0.3 mm thick at the thinnest sections, glabrous beneath the spikelets.

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.

10-15 mm, divergent, with 2-4 florets, lowest florets sterile and glumelike in 1 or both spikelets at each node;

disarticulation initially at the rachis nodes, subsequently 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.

subequal, (10)30-100 mm including the awns, the bases indurate and glabrous, glume bodies (2)5-10 mm long, 1-2 mm wide, setaceous, 2-3-veined, margins firm, awns (8)25-90 mm, each split into 3-9 unequal divisions, scabrous, flexuous to outcurving from near the glume bases at maturity;

fertile lemmas 8-10 mm, smooth or scabrous near the apices, 2 lateral veins extending into bristles to 10 mm, awns (10)20-110 mm long, about 0.2 mm wide at the base, divergent to arcuate;

paleas 7-9 mm, veins usually extending into about 1 mm bristles, apices acute to truncate;

anthers 1-2 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.

from late May to June.

= 28.

= 28.