Flora of North America species comparison

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

nodes 4-6, mostly concealed, glabrous.

50-120 cm, erect;

nodes 4-8, exposed or concealed, often reddish brown or blackish, 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.

evenly distributed;

sheaths usually glabrous, sometimes pubescent at the summit;

auricles 1-2 mm, often reddish brown or blackish;

ligules to 1 mm, often reddish brown;

blades 3-11 mm wide, lax, adaxial surfaces glabrous or short-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.

10-18 cm long, 3-5 cm wide, slightly nodding, with 2 spikelets per node;

internodes (5)7-13(18) mm long, about 0.2 mm thick at the thinnest sections, flexuous, with green lateral bands, glabrous except the dorsal angles hispid.

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, usually appressed, with 3(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.

often differing in length by more than 5 mm, sometimes vestigial to absent from the upper spikelets or throughout, 0-15(20) mm long including the undifferentiated awns, indurate at the base, 0.1-0.3 mm wide, setaceous to subulate, entire, 0-1-veined, glabrous, margins firm, awns often outcurving;

lemmas 8-10 mm, usually hairy, occasionally glabrous, awns (10)20-30(35) mm, slightly to strongly outcurving at maturity;

paleas 7-9 mm, obtuse to truncate, sometimes emarginate;

anthers 2.5-3 mm, evident in June.

from late May to June.

= 28.

= unknown.