Flora of North America species comparison

20-110 cm, erect or ascending.

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

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

internodes usually 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.

4-16 cm long, 2-3 cm wide, erect, open;

branches sometimes longer than the spikelets, slender, usually ascending, slightly curved or straight.

9-25 cm, open, nodding;

branches ascending or spreading, often recurved.

12-20 mm, lanceolate, terete to moderately laterally compressed;

florets 5-6, bases concealed at maturity;

rachilla internodes 1-1.5 mm, concealed at maturity.

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

smooth to scabrous;

lower glumes 4-6 mm, (3)5-veined;

upper glumes 4-7 mm, 7-veined;

lemmas 6.5-8 mm long, 3-4.5 mm wide, elliptic to lanceolate, coriaceous, backs smooth, distinctly 7(9)-veined, not ribbed, rounded over the midvein, margins scabrous, rounded, not inrolled at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm;

awns 5-9 mm, all more or less equal in length, straight, arising less than 1.5 mm below the lemma apices;

anthers 1.5-3 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.

shorter than the paleas, thin, weakly inrolled or flat.

sheaths densely hairy, hairs stiff, often retrorse;

upper sheaths glabrous or pubescent;

ligules 1-2 mm, glabrous or hairy, erose;

blades 7-18 cm long, 1-4 mm wide, pilose on both surfaces.

= 28.

= 14.