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.

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

nodes 1-2.

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.

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.

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 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.

(2.7)2.8-4.1 mm long, homomorphic.

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

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;

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.

= 54.

= unknown.