Flora of North America species comparison

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

nodes 3-6.

50-100 cm, erect to somewhat decumbent, not rooting at the lower nodes, usually branching at the aerial nodes.

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.

grayish-villous;

ligules 1.5-2 mm;

blades to 12 cm long, 2-2.2 mm wide, flat or folded, densely grayish-villous on both surfaces.

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, secondary branches not present;

primary branches 5-11 cm, axes not winged, without spikelets or with widely spaced abortive spikelets on the proximal 1-1.5 cm, bearing spikelets in unequally pedicellate pairs at midlength;

shorter pedicels about 2 mm;

longer pedicels about 3 mm, not adnate to the branch axes.

1.3-2.8 mm.

2.7-3.2 mm, appressed, 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.

minute, rounded, erose;

upper glumes slightly shorter than the spikelets, 3-veined, glabrous;

lower lemmas 7-veined, glabrous;

upper lemmas gray or yellow when immature, becoming purple at maturity.

, pers.

.).

= 36, 54.

= unknown.