Flora of North America species comparison

30-100 cm, erect or decumbent, sometimes rooting at the lower nodes;

nodes and internodes pubescent.

50-250 cm, erect, not rooting at the lower nodes;

internodes glabrous;

nodes 3-7, puberulent to appressed pilose, rarely glabrous.

sometimes inflated, glabrous or pubescent;

ligules 0.5-1 mm;

blades 10-20 cm long, 5-12 mm wide, flat, adaxial surfaces hairy.

glabrous;

collars hairy;

ligules 0.5-1.5 mm;

blades 10-60 cm long, 5-15 mm wide, linear, flat to conduplicate, straight or lax, spreading, glabrous adaxially.

3-16 cm long, 1-3 cm wide;

rachises villous;

branches 2-8, 20-70 mm long, 0.8-1.1 mm wide, velutinous, sometimes winged, with 11-24 solitary spikelets (occasionally paired proximally);

pedicels 0.5-1 mm, densely villous below, often with long hairs intermixed with the short hairs, apices with more than 12 hairs of 1.5-2.5 mm.

10-30 cm long, 2.5-10 cm wide, open or contracted;

rachises villous or puberulent;

branches 10-25, 15-60 mm long, 0.5-0.8 mm wide, appressed to spreading, villous to shortly pilose, rarely puberulent or scabrous, not winged, with 16-40 spikelets on the primary branches, spikelets in unequally pedicellate pairs or triplets proximally, solitary distally;

pedicels 0.3-2.5 mm, variously hirsute below, with fewer than 10 hairs more than 0.5 mm long at the apices.

3.9-5.2 mm long, 2-2.5 mm wide, ovate to elliptic.

3.7-5.7 mm long, 1.3-1.8 mm wide, ovate to elliptic.

occasionally present as a scale;

upper glumes equaling the lower lemmas, ovate to elliptic, glabrous or pubescent, 7-veined;

lower lemmas 3.4-5 mm long, 2-2.5 mm wide, 5-veined, acute to apiculate, unawned;

lower paleas absent;

anthers absent;

upper lemmas 3.5-5 mm, ovate to elliptic, acute to apiculate.

equaling the lower lemmas, ovate, hairy, 5-veined, acute, unawned, rarely mucronate;

lower lemmas 3.5-5 mm long, 1.3-1.8 mm wide, ovate to elliptic, setose, 5(7)-veined, acute, unawned;

lower paleas fully developed, as long as or longer than the lemmas, hyaline;

anthers 3 or absent;

upper lemmas 3.1-4.6 mm, indurate, elliptic, 5-veined, acute to rounded, mucronate or awned, awns 0.1-0.6 mm;

upper paleas 3-4.3 mm, indurate, blunt.

= 54.

= 36.