Flora of North America species comparison

20-55(70) cm, decumbent, branching and rooting at the lower nodes;

nodes 3-4.

to 100 cm, erect, not branching at the lower nodes;

nodes 1-2.

glabrous or sparsely pubescent;

ligules 0.6-2.5 mm;

blades 1.5-9 cm long, 3-5 mm wide, glabrous, with a few papillose-based hairs basally.

with appressed hairs, lower sheaths densely hairy, upper sheaths sparingly hairy near the base, otherwise glabrous;

ligules 2-3 mm;

blades 10-40 cm long, to 3 mm wide, usually flat, involute when dry.

terminal and axillary;

terminal panicles with 2-7 spikelike primary branches, subdigitate or on 0.5-2 cm rachises;

primary branches 6-15.5 cm, axes wing-margined, wings at least 1/2 as wide as the midribs, bearing spikelets in groups of 3, lower portions of the longer pedicels adnate to the axes;

secondary branches rarely present;

axillary inflorescences always present in some of the lower sheaths, entirely or partially concealed.

with 2-4 spikelike branches on 4-6 cm rachises;

primary branches 20-25 cm long, axes triquetrous, not winged;

primary branches bearing spikelets in unequally pedicellate groups of 3(-5) on the basal 1/2;

secondary branches rarely present, longer pedicels often adnate to the branch axes basally.

1.7-2.3 mm, homomorphic, narrowly elliptic.

2.2-2.5 mm long, 0.8 mm wide, elliptic, acute.

absent or a veinless, membranous rim;

upper glumes 1.3-2.3 mm, from 3/4 as long as to equaling the upper lemmas, appressed-pubescent;

lower lemmas 1.7-2.3 mm, 7-veined, veins unequally spaced, smooth, pubescent;

upper lemmas dark brown at maturity;

anthers 0.4-0.6 mm.

absent;

upper glumes 3-veined, margins and intercostal regions with long, glandular-tipped hairs;

lower lemmas 7-veined, margins and the region between the 2 inner marginal veins with long glandular hairs;

upper lemmas light to dark brown at maturity, striate, apiculate.

= 36.

= unknown.