Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

45-100 cm, erect or decumbent at the base;

nodes glabrous or almost so.

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.

evenly distributed over the lower 1/2 of the culms;

sheaths glabrous;

auricles usually present, to 1 mm;

ligules to 1 mm on the basal leaves, 1-3 mm on the flag leaves;

blades 2.5-6 mm wide, lax, abaxial surfaces smooth and glabrous, adaxial surfaces scabrous, with scattered 0.5-1 mm hairs, veins close together.

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.

12-25 cm long, 2.5-6 cm wide including the awns, 10-15 mm wide excluding the awns, flexuous, usually nodding or pendent at maturity, with 1 spikelet per node;

internodes 11-17 mm long, 0.4-1 mm wide, glabrous, mostly smooth, scabrous on the edges.

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.

14-26 mm long, 6-8 mm wide, appressed to divergent, 1.5-2 times as long as the internodes, with 4-6 florets;

rachillas glabrous;

disarticulation above the glumes and 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.

narrowly lanceolate, margins about 0.2 mm wide, 3(5)-veined, the bases flat, evidently veined, margins hyaline, widest at about midlength, acute or acuminate, unawned or awned, awns to 4 mm, straight;

lower glumes 5-9 mm;

upper glumes 8-10 mm;

lemmas 8-15 mm, scabrous, rounded on the back, awns 10-25 mm, arcuately diverging;

paleas as long as or longer than the lemmas, tapering, apices truncate, about 0.3 mm wide;

anthers 3-5 mm.

from late May to June.

= 28.

= 28.