Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

30-130 cm tall, 1-5 mm thick, erect or weakly decumbent;

nodes 3-4, glabrous, glaucous.

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.

basal and cauline;

sheaths glaucous, glabrous or with hairs, lower sheaths sometimes hairy, upper sheaths glabrous, margins sometimes ciliate;

auricles 1.5-2.5 mm;

ligules about 0.3 mm;

blades 10-25 cm long, 3-10 mm wide, glabrous or pilose.

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.

10-22 cm long, 1.5-2.5 cm wide including the awns, 0.8-1 cm wide excluding the awns, inclined to nodding, with 1 spikelet at all or most nodes;

rachises scabrous on the edges, glabrous below the spikelets;

internodes 10-25 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.

5-22 mm long, about 5 mm wide, appressed, with 4-12 florets;

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.

narrowly elliptic to lance-oblong, apices acute to acuminate;

lower glumes 5-11 mm;

upper glumes 7-13 mm;

lemmas 7-12 mm, mostly glabrous, glabrate, or sparsely hairy, margins with coarse stiff hairs, hairs to 1 mm, apices abruptly narrowed, awned, awns 10-20 mm, scabrous, strongly outcurved to recurved;

paleas 2/3 - 4/5 the length of the lemmas, keels winged distally, distinctly outwardly curved below the apices, apices 0.5-0.6 mm wide, truncate to rounded;

anthers about 2 mm.

from late May to June.

StY.

= 28.

= 28.