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, unbranched, glabrous;

nodes 1-2.

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.

densely hairy, hairs papillose-based;

ligules 0.8-2.2 mm;

blades 10-24 cm long, 2-4.5 mm wide, with papillose-based hairs.

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.

with 2-3 spikelike primary branches on 4-7 mm rachises;

secondary branches rarely present;

primary branches (5)10-22 cm, axes 0.5-0.6 mm wide, not wing-margined, middle portions of the branches bearing spikelets in groups of 3;

pedicels appressed to the axes.

1.3-2.8 mm.

2.3-2.4 mm, lanceolate to oblanceolate-elliptic;

lower glumes absent;

upper glumes 1.4-1.5 mm, more than 1/2 as long as the spikelets, 3-veined, truncate to acute, mostly glabrous, apices sparsely hairy;

lower lemmas about as long as the spikelets, 7-veined, mostly glabrous, apices sparsely hairy;

upper lemmas 2.3-2.4 mm, dark brown to black, apiculate;

anthers 1-1.1 mm.

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.

, pers.

.).

= 36, 54.

= unknown.