Flora of North America species comparison

30-60 cm, slender.

(60)70-140 cm, erect or spreading;

nodes 5-9, pubescent or glabrous, often concealed by the sheaths;

internodes usually glabrous.

pilose-pubescent to nearly glabrous;

blades 7-28 cm long, 2-9 mm wide, pilose or glabrous.

usually retrorsely pilose, sometimes glabrous, with a dense line of hairs at the collar, lower sheaths often sericeous;

auricles absent;

ligules 0.4-1 mm, often hairy, truncate, erose, ciliolate;

blades 15-30 cm long, 5-12 mm wide, often shiny yellow-green, flat, abaxial surfaces pilose, adaxial surfaces glabrous or pilose over the veins.

10-20 cm long, 3-9 cm wide, erect, dense;

branches appressed to spreading, sometimes flexuous.

9-25 cm, open, nodding;

branches ascending or spreading, often recurved.

15-20 mm, elliptic to lanceolate, more or less terete, with 3-9 florets.

18-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, often purplish, with 6-12 florets.

glabrous, acuminate;

lower glumes 8-10 mm, 1-veined;

upper glumes 12-16 mm, 3(5)-veined;

lemmas 11-14 mm, lanceolate to linear-lanceolate, sparsely pubescent, 5-veined, rounded over the midvein, apices acuminate, bifid, teeth 2-3 mm, usually aristate, sometimes acuminate;

awns 13-20 mm, geniculate, strongly to moderately twisted in the basal portion, arising 1.5 mm or more below the lemma apices;

anthers 2-2.5 mm.

usually pubescent;

lower glumes 5.5-8 mm, 1(3)-veined;

upper glumes 7-10 mm, 5-veined, often mucronate;

lemmas 8-13 mm, elliptic to lanceolate, rounded over the midvein, usually uniformly densely hairy, or the backs less densely so, apices acute to obtuse, entire;

awns 5-8 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2.8-3.5(5) mm.

= unknown.

= 14.