Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

20-90 cm, sometimes decumbent at the base, ascending to erect above;

nodes usually pubescent, sometimes 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.

sometimes basally concentrated;

sheaths smooth or scabrous, glabrous or pilose;

auricles absent or to 0.5 mm;

ligules 0.2-1 mm, erose, ciliolate;

blades 3-7 mm wide, flat, both surfaces smooth, scabrous, or 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.

3.5-14 cm long, 0.5-0.8 cm wide, erect or nodding distally, usually with 1 spikelet per node, occasionally with 2 at the lower nodes;

internodes 3-10 mm long, 0.5-0.8 mm wide, mostly glabrous and smooth, edges scabrous or ciliate.

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.

9-15(20) mm, 2-5 times longer than the internodes, appressed, with 3-6 florets, rachillas hispidulous;

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.

4-8 mm long, (1.2)1.5-2 mm wide, 1/3-2/3 as long as the adjacent lemmas, oblanceolate to obovate, flat, usually purplish, glabrous or hairy, hairs 0.3-0.5 mm, margins unequal, the widest margin 0.4-1 mm wide, both margins widest above the middle, apices unawned or awned, awns to 1 mm;

lemmas 7-11 mm, glabrous or hairy, sometimes scabridulous, sometimes more densely hairy distally, hairs 0.2-0.6 mm, all alike, apices unawned or awned, awns to 7 mm, straight;

paleas subequal to the lemmas, keels straight below the apices;

anthers 1-2 mm.

from late May to June.

= 28.

= 28.