Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

40-100 cm, erect or decumbent only at the base, glabrous.

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.

somewhat basally concentrated;

sheaths glabrous;

auricles usually present, to 0.8 mm;

ligules 0.2-0.5 mm, ciliolate;

blades 1-3 mm wide, usually involute, adaxial surfaces scabrous to strigose.

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.

4-14 cm long, 1.5-2.5 cm wide including the awns, 0.3-0.8 cm wide excluding the awns, erect, with 1 spikelet per node;

internodes 6-14 mm long, 0.2-0.4 mm wide, glabrous or pubescent beneath 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.

10-18 mm, 1.5-2 times longer than the internodes, appressed to ascending, with 3-7 florets;

rachillas strigillose;

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, 1/2 as long as to almost equaling the adjacent lemmas, glabrous or hairy, weakly keeled, keels and adjacent veins smooth to evenly and strongly scabrous from the base to the apices, margins 0.2-0.3 mm wide, apices acute, acuminate, or shortly awned;

lower glumes 4-8 mm;

upper glumes 4.5-8 mm;

lemmas 7.5-9.5 mm, glabrous or densely hairy, awns 4-12 mm, at least some strongly divergent;

paleas subequal to the lemmas, tapering to the 0.1-0.3 mm wide apices;

anthers 3-5 mm.

from late May to June.

= 28.

= 28.