Flora of North America species comparison

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

nodes 3-6.

30-56 cm, erect;

nodes glabrous.

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.

mainly cauline;

sheaths glabrous or sparsely to densely pubescent, sometimes with papillose-based hairs;

ligules 0.2-1.5 mm, entire to lacerate;

blades 2.4-12.6 cm long, 2-5.4 mm wide, glabrous or pubescent.

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, 12.8-27.5 cm long, 16.5-44.5 cm wide, open;

branches divergent;

lower primary branches 10.5-24 cm, often with 1-several sterile branches near the base;

pedicels divergent, spikelets solitary.

1.3-2.8 mm.

2.2-3.1 mm long, 0.7-1.1 mm wide, obovate or broadly elliptic.

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.

0.1-0.8 mm;

upper glumes 1.8-2.8 mm, 3(5)-veined, glabrous or pubescent between the veins, hairs appearing as a narrow stripe;

lower lemmas similar to the upper glumes in length, texture, and pubescence, 7-veined, veins unequally spaced, lateral veins closer together than the 3 central veins;

upper lemmas 1.9-2.9 mm, glabrous, dark brown, narrowly acute;

anthers 0.5-0.7 mm, yellow or purple.

1.3-1.6 mm.

, pers.

.).

= 36, 54.

= 36.