Flora of North America species comparison

(10)25-150 cm, erect or decumbent, branching, sometimes rooting at the lower nodes;

nodes 3-6.

40-90 cm, erect, geniculate.

keeled, basal sheaths usually with papillose-based hairs, rarely glabrous;

ligules 0.3-1.5 mm;

blades 2-18 cm long, 1-6 mm wide, flat or involute, glabrous, scabrous, or pilose.

with 2-7 spikelike primary branches, these digitate or the rachises to 1 cm;

longest primary branches 20-25 cm, axes triquetrous, not winged, with spikelets in unequally pedicellate groups of 3(-5) on the basal ½ (J.

simple, 10-18 cm, open;

branches divergent;

pedicels 0.4-3 mm, divergent, spikelets solitary.

1.3-2.8 mm.

2-2.5 mm, elliptical, apiculate.

absent or to 0.1 mm;

upper glumes 1-2 mm long, from 3/4 to almost as long as the spikelets, almost glabrous or sparsely to densely pubescent with clavate to capitate hairs (use 20x magnification), glume apices rounded;

lower lemmas equaling the spikelets, glabrous or glandular-pubescent, 5-7-veined, veins unequally spaced, outer 3 veins on each side closer to each other than the midvein is to the inner lateral veins;

upper lemmas 1.3-2 mm, apiculate, dark brown at maturity;

anthers 0.3-0.6 mm.

absent or to 0.2 mm;

upper glumes absent or to 0.6 mm, veinless;

lower lemmas as long as the spikelets, 5-veined, margins and intercostal regions more or less pubescent;

upper lemmas minutely rugose, dark brown.

, pers.

.).

sheaths densely villous;

upper sheaths with scattered papillose-based hairs;

ligules 1.5-3 mm;

blades 4-7(12) cm long, 3-5 mm wide, villous to nearly glabrous, usually sparsely hairy near the ligules.

= 36, 54.

= 36.