Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

25-100 cm tall, 1.3-3.5 mm thick, erect;

nodes 4-6, 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.

basal and cauline;

sheaths glaucous, glabrous or with hairs, margins glabrous or ciliate distally;

auricles 1-2 mm;

ligules 0.2-0.7 mm, truncate;

blades 3-10 mm wide, flattish, often 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.

(6.5)10-25 cm long, 1.4-4 cm wide including the awns, 0.7-20 cm wide excluding the awns, flexuous, nodding;

rachises densely to sparsely hirsute on the edges, hairs about 0.2 mm, glabrous elsewhere, glaucous;

internodes (5)8-20 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.

15-25 mm, loosely appressed or ascending, with 5-10 florets;

rachillas hairy, hairs about 0.1 mm;

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.

lanceolate, tapering from about midlength, adaxial surfaces glabrous, hyaline margins about 0.1 mm wide, strongly keeled distally, midvein scabrous distally, other veins smooth or scabrous, apices acute to acuminate, sometimes awned, awns 2-5 mm;

lower glumes 4-7 mm, 3-5-veined;

upper glumes 5-8 mm, 5-veined;

calluses glabrous;

lemmas 8-12 mm, lanceolate, glabrous or pilose, apices acute, awned, awns 20-40 mm, straight or flexuous;

paleas from slightly shorter than to longer than the lemmas, keels narrowly winged distally, not or scarcely extending beyond the intercostal region, distinctly outwardly curved below the apices, apices 0.3-0.5 mm wide;

anthers 1.5-2.5 mm.

from late May to June.

= 28.

= 42.