Flora of North America species comparison

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

nodes 3-6.

35-140 cm, erect or decumbent, not rooting at the basal 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.

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 3-15 spikelike primary branches, digitate or with rachises to 3 cm;

primary branches 5-25 cm, wing-margined, wings wider than the midribs, bearing spikelets in unequally pedicellate pairs;

shorter pedicels 0.5-1.5 mm;

longer pedicels 1.5-3 mm.

1.3-2.8 mm.

homomorphic, 2.8-3.5 mm, narrowly lanceolate to narrowly 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.

0.3-0.5 mm, veinless, acute;

upper glumes 1.7-1.9 mm, wooly pubescent;

lower lemmas 2.5-3.5 mm, 7-veined, veins unequally spaced and smooth, occasionally the lateral veins scabridulous over the distal 1/4, margins and region between the 2 inner lateral veins appressed-pubescent, with 0.5-1.5 mm hairs;

upper lemmas gray when immature, becoming brownish at maturity;

anthers 1.2-1.6 mm, purple.

, pers.

.).

sheaths glabrous or pubescent, often densely so, hairs 4-6 mm, papillose-based;

ligules (1.8)3-5 mm, erose and ciliate;

blades 5-40 cm long, 3-6 mm wide, scabridulous, often also papillose-hairy.

= 36, 54.

= 36.