Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

50-110 cm, erect or somewhat geniculate at the base;

nodes 6-9, mostly exposed, 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 usually glabrous, occasionally pilose, hairs somewhat retrorse;

auricles about 1 mm, pale or brownish;

ligules about 1 mm, erase;

blades 3-12 mm wide, lax, adaxial surfaces sparsely scabridulous, sometimes hispidulous to pilose on the veins, usually glaucous.

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.

4-12 cm long, 2-3 cm wide, erect, the bases sometimes sheathed, with 2 spikelets per node;

internodes 3-6 mm, about 0.2 mm thick at the thinnest sections, with 2 hispid dorsal angles, without green lateral bands.

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.

10-15 mm excluding the awns, 18-30 mm including the awns, appressed, with 3-5(6) florets, lowest florets functional;

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, 12-22 mm long including the undifferentiated awns, 0.2-0.3(0.6) mm wide, setaceous, entire, 0-1(2)-veined, tapering from the base, glabrous, margins firm, awns more or less straight;

lemmas 8-10 mm, usually scabrous-hispid or thinly strigose, at least distally, awns 8-22 mm, straight or flexuous;

paleas 7-8 mm, obtuse, often emarginate;

anthers 2.5-4 mm.

from late May to June.

May to June.

= 28.

= unknown.