Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

54-135 cm, 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.

evenly distributed;

sheaths glabrous;

auricles absent or to 1 mm;

ligules 0.6-1 mm, truncate, erose;

blades 5-13 mm wide, flat to involute, abaxial surfaces smooth, glabrous, adaxial surfaces glabrous, veins closely spaced, all more or less equally prominent, smooth or scabrous.

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.

10-50 cm long, 0.8-1.8 cm wide, with 1 spikelet per node, glabrous below the spikelets;

internodes 5-8 mm long, about 0.2 mm thick, about 0.3 mm wide, both surfaces hairy, hairs 0.2-0.4 mm.

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.

15-27 mm, appressed to ascending, with 5-7 florets;

rachillas scabridulous;

disarticulation above the glumes, beneath the florets.

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.

equal, 5-11 mm long, 1.3-1.8 mm wide, stiff, lanceolate to linear-lanceolate, strongly rounded to keeled distally, keels inconspicuous and smooth on the proximal 1/3-1/2, conspicuous and with a few teeth distally, lateral veins inconspicuous, hyaline margins 0.1-0.2 mm wide, apices acuminate to awned, awns to 8 mm;

lemmas 7-12 mm, glabrous, smooth, apices unawned or awned, awns to 12 mm, straight;

paleas ciliate on the keels, apices about 0.6 mm wide;

anthers 4-7 mm.

from late May to June.

= 28.

= 42.