Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

18-75 cm, often decumbent or geniculate;

nodes usually glabrous.

glabrous;

auricles about 0.5 mm;

ligules 0.5-1 mm, truncate;

blades 3-4 mm wide, flat, glabrous or hairy, abaxial surfaces less densely hairy and with shorter hairs than the adaxial surfaces, apices acute.

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.

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.

5-12 cm long, 0.4-0.7 cm wide excluding the awns, erect, with 1 spikelet per node;

internodes 4-5.5 mm, edges 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.

11-19 mm, appressed, with (3)4-5 florets;

rachillas hairy, hairs about 0.4 mm;

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.

8-12 mm long, 1.2-2 mm wide, about 3/4 as long as to equaling the adjacent lemmas, narrowly ovate to obovate, often purplish, glabrous, sometimes scabrous, flat or equally keeled the full length, keels and other veins usually smooth, sometimes scabrous, 3(5)-veined, adaxial surfaces glabrous, margins usually unequal, the wider margin 0.3-1 mm wide, usually widest in the distal 1/3, apices acute to rounded, often awned, awns to 2 mm;

lemmas glabrous or pubescent, hairs flexible, all similar, apices usually awned, awns 0.5-3 mm, straight;

paleas subequal to the lemmas, tapering to the apices, apices about 0.4 mm wide;

anthers 0.7-1.3 mm.

from late May to June.

StH.

= 28.

= 28.