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.

30-80 cm, sometimes erect, usually decumbent and branching and rooting at the lower nodes, not branching at the upper nodes.

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.

of the lower leaves villous, those of the upper leaves sometimes glabrous, those of the flag leaves without axillary panicles;

ligules 1.5-2 mm;

blades 10-15 cm long, 2-7 mm wide, hirsute to nearly glabrous.

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 5-10 spikelike primary branches on 1-4 cm rachises;

primary branches 5-10(13) cm, axes triquetrous, narrowly winged, wings less than 1/2 as wide as the midribs, lower and middle portions of the branches bearing paired spikelets;

secondary branches rarely present.

(2.7)2.8-4.1 mm long, homomorphic.

2-3.6 mm, narrowly ovate-oblong, acute.

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.

absent;

upper glumes almost as long as the spikelets, 3(5)-veined, shortly villous on the margins and sometimes between the margins;

lower lemmas similar to the upper glumes;

upper lemmas gray or yellow, sometimes purple-tinged, becoming purple at maturity.

narrowly oblong.

= 54.

= 54.