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.

40-90 cm, erect, sometimes geniculate, not rooting, at the lower 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.

mainly cauline;

basal sheaths villous;

upper sheaths glabrous or sparsely to densely hirsute, hairs papillose-based;

ligules (1)1.5-4 mm, entire to lacerate;

blades 5-15 cm long, 1-4 mm wide, glabrous or sparsely pubescent.

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 4-10 spikelike primary branches on (4)10-18 cm rachises;

primary branches 4-10 cm, usually divergent at maturity, varying to ascending, axes not wing-margined, bearing spikelets in unequally pedicellate pairs;

internodes (4.5)6-15 mm (mid-branch);

secondary branches rarely present;

shorter pedicels 2-2.5 mm;

longer pedicels 7-8 mm;

terminal pedicels of primary branches 7.4-20 mm.

(2.7)2.8-4.1 mm long, homomorphic.

homomorphic, 3.7-5.8 mm (including pubescence), 2.9-4.3 mm (excluding pubescence).

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 0.3-0.5 mm;

upper glumes 2.4-3.5 mm (excluding pubescence), 3-veined, densely villous, hairs 1.5-4 mm, silvery-white to purple, spreading at maturity;

lower lemmas 2.8-4.2 mm (excluding pubescence), exceeding the upper lemmas by 0.8-2.2 mm, 5-veined and the veins equally spaced or 7-veined and the lateral veins closer to each other than to the central vein, margins densely villous, hairs 1.5-4 mm, silvery-white to purple, spreading at maturity, apices acuminate;

upper lemmas 2.6-3.2 mm, lanceolate, brown when immature, dark brown at maturity, acuminate.

= 54.

= 72.