Flora of North America species comparison

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

nodes 3-6.

60-100 cm, erect.

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.

villous, particularly the lower sheaths;

ligules 0.2-0.4, fimbriate;

blades to 47 cm long, 1-2.1 mm wide, involute, glabrous and smooth abaxially, scabrous adaxially, sometimes with a few long hairs near the base.

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.

of 2-3(5) spikelike primary branches on elongate rachises;

primary branches 8-13(20) cm, narrowly winged, wings no more than 1/2 as wide as the midribs, bearing spikelets in unequally pedicellate groups of 3-4(5);

secondary branches rarely present;

longest pedicels to 5 mm.

1.3-2.8 mm.

1.7-2.3 mm, elliptical, glabrous.

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;

upper glumes 0.9-1 mm, less than 1/2 as long as the spikelets, 3-veined, glabrous, broadly rounded to truncate;

lower lemmas slightly shorter than the spikelets, 5-veined, glabrous;

upper lemmas smooth, brown when immature, dark brown at maturity.

, pers.

.).

= 36, 54.

= unknown.