Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

30-130 cm, erect;

nodes 4-7, mostly exposed, usually glabrous, occasionally short-hairy.

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 minute or absent;

ligules 0.5-1 mm;

blades 3-18 mm wide, lax, usually pale green, sometimes glaucous, adaxial surfaces usually smooth or scabrous on the veins, sometimes sparsely 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.

7-23 cm long, 1-2.5 cm wide, usually slightly nodding, sometimes erect, usually with 2 spikelets per node, occasionally with 1 spikelet at some nodes;

internodes 3-6 mm long, 0.2-0.8 mm thick at the thinnest sections, angles usually with scattered hairs.

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, appressed to divergent, often purplish, with (2)3-4(5) 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.

equal, the bases flat, not indurate, veins evident, glume bodies 6-9 mm long, 1-1.5 mm wide, linear-lanceolate, entire, widening or parallel-sided above the base, (1)3-5(7)-veined, veins scabrous, margins hyaline or scarious, awns (0)1-5 mm, straight or outcurving;

lemmas (5)7-11 mm, usually glabrous and smooth throughout, sometimes scabrous to hispid distally and on the margins, marginal hairs not markedly longer than those elsewhere, awns (3)6-17(20) mm, usually somewhat outcurving from near the base;

paleas 7-11 mm, keels spinose-ciliate, apices obtuse or truncate;

anthers 1.5-3.5 mm.

from late May to June.

from May to July.

= 28.

= 42.