Flora of North America species comparison

60-140 cm;

nodes glabrous or retrorsely pubescent.

8-65 (77) cm, erect or geniculate to slightly decumbent, sometimes puberulent;

nodes 4-6, mostly concealed, usually glabrous, sometimes pubescent.

evenly distributed;

sheaths glabrous or pubescent;

auricles usually present, 0.5-2 mm;

ligules 0.3-3.5 mm, truncate to acute, sometimes long-ciliate;

blades 4-6.5 mm wide, flat or the margins involute, straight.

evenly distributed;

sheaths glabrous, scabrous, puberulent, or densely white-villous;

auricles usually present, to about 1 mm, often purplish;

ligules shorter than 1 mm, truncate, entire or lacerate;

blades (1)2-4(6) mm wide, spreading or ascending, often involute, sometimes folded, abaxial surfaces glabrous to puberulent, adaxial surfaces scabrous, puberulent, hirsute, or white-villous.

15-31 cm long, 0.4-1.5 cm wide including the awns, 0.4-0.8 cm wide excluding the awns, erect, with 1 spikelet per node;

internodes 9-27 mm long, 1-1.3 mm wide, glabrous, smooth.

3-20 cm long, 5-15 cm wide, erect to sub-flexuous, with 2-3 spikelets per node, rarely with 1 at some nodes;

internodes 3-10(15) mm long, 0.1-0.4 mm thick at the thinnest sections, usually glabrous, sometimes puberulent beneath the spikelets.

13-29 mm long, from shorter than to almost twice as long as the internodes, 2.5-5 mm wide, appressed, with 5-7 florets;

rachillas glabrous;

disarticulation above the glumes and beneath each floret.

10-20 mm, divergent, sometimes glaucous, at least 1 spikelet at a node with 2-4(5) florets, 1-4(5) florets fertile, sometimes all florets sterile in the lateral spikelets;

disarticulation initially at the rachis nodes, subsequently beneath each floret.

subequal, 7.5-12 mm long, 1.2-1.5 mm wide, lanceolate, widest at about mid-length, flat or rounded on the back, 5-veined, veins smooth, scabrous or just the midvein scabridulous, margins widest at about midlength, apices acute, unawned;

lemmas 9-12 mm, glabrous, sometimes scabrous, acute, unawned or awned, awns to 28 mm, straight;

paleas subequal to the lemmas, tapering, apices 0.2-0.3 mm wide;

anthers (3.5)4-7 mm.

subequal, 20-135 mm including the often undifferentiated awns, the bases indurate and glabrous, glume bodies 5-10 mm long, 1-3 mm wide, linear to setaceous, 1-3-veined, margins firm, awns 15-125 mm, scabrous, sometimes split into 2-3 unequal divisions, flexuous to outcurving from near the base at maturity;

fertile lemmas 6-12 mm, glabrous, scabrous, or appressed-pubescent, 2 lateral veins extending into bristles to 10 mm, awns 15-120 mm long, about 0.4 mm wide at the base, often reddish or purplish, scabrous, flexuous to curved near the base;

paleas 6-11 mm, veins often extending into bristles to 2(5) mm, apices acute to truncate;

anthers 0.9-2.2 mm.

from late May to July.

= 28.

= 28.