Flora of North America species comparison

20-70(112), often decumbent and rooting at the lower nodes.

15-80 m, decumbent, rooting and branching at the lower nodes.

keeled, usually sparsely pubescent with papillose-based hairs;

ligules 0.5-2.6 mm;

blades 2-11(14) cm long, 3-8(12) mm wide, usually with papillose-based hairs on both surfaces, sometimes glabrous.

pilose, with papillose-based hairs;

ligules 1.8-2 mm;

blades 4-15 cm long, 3-10 mm wide, pilose, with papillose-based hairs.

with 4-13 spikelike primary branches, these subdigitate or on rachises to 6 cm;

primary branches 3-30 cm long, 0.7-1.5 mm wide, flattened and winged, wings more than 1/2 as wide as the midribs, lower and middle portion of the branches bearing spikelets in unequally pedicellate pairs, pedicels not adnate to the branches;

secondary branches rarely present.

with 5-18 spikelike primary branches on 2.5-5 cm rachises, lower branches usually verticillate;

primary branches 3.5-10 cm long, 0.3-0.5 mm wide, narrowly wing-margined, wings less than 1/2 as wide as the midribs, bearing spikelets in unequally pedicellate pairs;

secondary branches often present, often highly divergent;

shorter pedicels 0.2-0.5 mm;

longer pedicels 0.8-1.1 mm.

homomorphic, 1.7-3.4 mm long, 0.7-1.1 mm wide.

1.5-2 mm long, about 0.5 mm wide, elliptic-lanceolate.

0.2-0.4 mm long, veinless;

upper glumes 0.9-2 mm, 1/3 – 1/2 as long as the spikelets, 3-veined, pubescent on the margins;

lower lemmas usually exceeded or equaled by the upper florets, sometimes exceeding them but by no more than 0.2 mm, glabrous, 7-veined, lateral (or all) veins scabrous throughout or smooth on the lower (1/3)1/2 and scabrous distally, 3 middle veins usually widely spaced, remaining veins on each side close together and near the margins;

upper lemmas 1.7-3 mm, yellow or gray, frequently purple-tinged when immature, often becoming brown at maturity;

anthers 0.5-0.9 mm.

absent or to 0.2 mm;

upper glumes 1.5-1.7 mm, usually to 3/4 as long as the spikelets, 3-veined, villous between the veins, hairs tapering or parallel-sided;

lower lemmas about as long as the spikelets, 7-veined, veins unequally spaced, 2 veins crowded together near each margin, 3 inner veins well-separated, pubescent on the margins and between the inner lateral veins, hairs about 0.2 mm, sometimes sparse, lateral veins smooth throughout or scabridulous only on the distal 1/3;

upper lemmas 1.5-1.7 mm, usually gray at maturity, sometimes brown;

anthers about 0.5 mm.

= 36, 28, 34, 54.

= 18.