Flora of North America species comparison

10-100 cm long, erect portion 30-60 cm, long-decumbent, rooting and branching at the decumbent nodes, sparingly branched or unbranched from the upper nodes;

nodes 2-5, glabrous.

20-60 cm, glabrous, decumbent, rooting and branching from the lower nodes, geniculate above.

with papillose-based hairs;

ligules 2-3.5 mm, erose;

blades 1.5-14.4(18.9) cm long, 3-9 mm wide, flat, glabrous, a few scattered papillose-based hairs at the base of the adaxial surfaces (occasionally over the whole adaxial surface), usually also scabrous on both surfaces.

glabrous or with long hairs near the base;

ligules 0.8-2.5 mm;

blades 2-13.5 cm long, 1.5-2.5 mm wide, glabrous on both surfaces or the adaxial surface with a few long hairs near the base.

with 2-10 spikelike primary branches, these digitate or in 1-3 whorls on rachises to 2 cm;

lowest panicle nodes with hairs more than 0.4 mm;

primary branches 3-24 cm long, 0.6-1.2(2) mm wide, glabrous or with less than 1 mm hairs, axes wing-margined, wings at least 1/2 as wide as the midribs, lower and middle portions of the branches bearing spikelets in unequally pedicellate pairs;

secondary branches absent;

shorter pedicels 0.5-1 mm;

longer pedicels 1.5-4 mm.

with 3-8 spikelike primary branches, these digitate or with rachises to 2 cm long;

lower panicle nodes with hairs at least 0.4 mm;

primary branches 4-15.5(20) cm long, 0.4-0.8 mm wide, axes wing-margined, wings more than 1/2 as wide as the midribs, proximal portions of the branches often with scattered 1-4 mm hairs, bearing spikelets in unequally pedicellate pairs on the lower and middle portions of the branches;

secondary branches absent;

pedicels not adnate to the branches.

(2.7)2.8-4.1 mm long, homomorphic.

homomorphic, 1.7-2.8 mm long, 0.5-0.8 mm wide.

glumes 0.2-0.8 mm, acute;

upper glumes (1.2)1.5-2.7 mm, about 2/3 to almost as long as the spikelet, 3-veined, margins and apices pilose;

lower lemmas 2.7-4.1 mm, 7-veined, veins unequally spaced, outer 3 veins crowded together near each margin, well-separated from the midvein, usually smooth, occasionally the lateral veins scabridulous on the distal 1/3 margins and regions between the 2 inner lateral veins hairy, hairs 0.5-1 mm (rarely glabrous), sometimes also with glassy yellow hairs between the 2 inner lateral veins, these more common on the upper spikelets;

upper lemmas 2.5-4 mm, glabrous, yellow, tan, or gray when immature, becoming brown, often purple-tinged (occasionally completely purple) at maturity;

anthers 0.6-1 mm.

glumes absent or to 0.2 mm;

upper glumes 1-2.2 mm, 0.4-0.8 times as long as the spikelets;

lower lemmas about as long as the spikelets, 7-veined, veins smooth, lateral veins usually equally spaced, sometimes the inner lateral veins more distant from the other 2, intercostal regions adjacent to the midveins glabrous, those between the lateral veins with 0.5-1 mm hairs, hairs initially appressed, sometimes strongly divergent at maturity;

upper lemmas yellow to gray when immature, becoming brown at maturity;

anthers 0.3-0.6 mm.

= 54.

= unknown.