Flora of North America species comparison

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

nodes 3-4.

(10)25-150 cm, erect or decumbent, branching, sometimes rooting at the lower nodes;

nodes 3-6.

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.

keeled, basal sheaths usually with papillose-based hairs, rarely glabrous;

ligules 0.3-1.5 mm;

blades 2-18 cm long, 1-6 mm wide, flat or involute, glabrous, scabrous, or pilose.

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 2-7 spikelike primary branches, these digitate or the rachises to 1 cm;

longest primary branches 20-25 cm, axes triquetrous, not winged, with spikelets in unequally pedicellate groups of 3(-5) on the basal ½ (J.

1.7-2.3 mm, homomorphic, narrowly elliptic.

1.3-2.8 mm.

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 or to 0.1 mm;

upper glumes 1-2 mm long, from 3/4 to almost as long as the spikelets, almost glabrous or sparsely to densely pubescent with clavate to capitate hairs (use 20x magnification), glume apices rounded;

lower lemmas equaling the spikelets, glabrous or glandular-pubescent, 5-7-veined, veins unequally spaced, outer 3 veins on each side closer to each other than the midvein is to the inner lateral veins;

upper lemmas 1.3-2 mm, apiculate, dark brown at maturity;

anthers 0.3-0.6 mm.

, pers.

.).

= 36.

= 36, 54.