Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

(15)50-130 cm, erect, mostly glabrous;

nodes usually glabrous, sometimes slightly pubescent.

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.

more or less evenly distributed;

basal sheaths glabrate, margins not evidently ciliate;

auricles absent or to 1.2 mm;

ligules 0.1-1.1 mm;

blades to 28 cm long, 1.7-5 mm wide, involute when dry, adaxial surfaces usually densely pubescent, rarely sparsely pubescent.

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.

5-20 cm long, 2.5-3 cm wide including the awns, erect to slightly nodding, with 1 spikelet per node;

internodes 5-12 mm long, about 0.2 mm thick, about 0.3 mm wide, glabrous 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.

10-22 mm long, about twice as long as the internodes, 2-8.5 mm wide, appressed, with 4-10 florets;

rachillas glabrous;

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.

4-10 mm long, 0.5-1.3 mm wide, narrowly lanceolate, widest at or below midlength, glabrous, often glaucous, 1-3-veined, flat or weakly keeled, margins 0.1-0.2 mm wide, widest near midlength, apices usually acuminate, awned or unawned, awns to 6 mm;

lemmas 6-12 mm, smooth or slightly scabrous, margins often sparsely pubescent proximally, apices awned, longest awns in the spikelets 9-28 mm, strongly divergent;

paleas 7.2-10.5 mm, keels scabrous distally, tapering to the 0.2-0.3 mm wide apices;

anthers 3.5-6 mm.

from late May to June.

= 28.

= 28.