Flora of North America species comparison

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

nodes 3-6.

20-55 cm, erect, sometimes geniculate, not rooting at the lower 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 3-6 spikelike primary branches on 6-10(15) cm rachises;

primary branches 1-6 cm, not or only narrowly winged, bearing spikelets in unequally pedicellate pairs, pedicels not adnate to the branch axes;

shorter pedicels 1.5-2 mm;

longer pedicels 3-4 mm.

1.3-2.8 mm.

homomorphic, 2.5-3.1 mm (including pubescence), 2.4-3 mm (excluding pubescence).

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.

0.3-1 mm, veinless;

upper glumes 2.1-3 mm (including pubescence), as long as or exceeding the upper florets by no more than 0.5 mm, 3-veined, densely appressed-pubescent, hairs 0.5-1 mm, white to purple, tapering or parallel-sided, not spreading at maturity;

lower lemmas 2.3-3.1 mm (including pubescence), as long as or exceeding the upper lemmas by up to 0.5 mm, 5-veined, veins equally spaced, intercostal regions densely appressed-pubescent, hairs 0.5-1 mm, white to purple, tapering or parallel-sided, not spreading at maturity;

upper lemmas 2.2-2.5 mm, brown when immature, dark brown at maturity.

2.1-3.4 mm.

, pers.

.).

sheaths tomentose;

culm sheaths glabrous or variously pubescent (puberulent, ciliate, or sparsely hirsute);

ligules (0.1)0.5-1(1.5) mm, ciliate;

blades 2-5.5 cm long, 2-3 mm wide.

= 36, 54.

= 36.