Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

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 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, 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.

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.

3-20 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.

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.

10-20 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, (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.

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 June.

from late May to July.

= 28.

= 28.