Flora of North America species comparison

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

nodes 3-6.

50-250 cm, erect or decumbent, rooting or not 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 2-18 spikelike primary branches, these digitate or with rachises to 6 cm;

primary branches 5-25 cm, axes wing-margined, wings about as wide as the midribs, bearing spikelets in unequally pedicellate pairs;

secondary branches rarely present;

shorter pedicels 0.2-0.3 mm;

longer pedicels 1-1.5 mm.

1.3-2.8 mm.

homomorphic, 2.5-3.5 mm long, 0.7-0.9 mm wide, lanceolate.

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.

0.2-0.5 mm, acute to truncate;

upper glumes (1.2)1.6-2.3 mm, from 1/5 as long as to almost equaling the spikelets;

lower lemmas 2.5-3.5 mm, 7-veined, veins unequally spaced, midvein and lateral veins scabrous at least on the distal 1/2, margins and region between the inner 2 lateral veins with straight, yellowish, 0.6-1 mm hairs;

upper lemmas gray to tan at maturity.

, pers.

.).

sheaths glabrous or variously pubescent (pilose, rarely tomentose or with papillose-based hairs);

upper sheaths glabrous;

ligules 0.8-2.5 mm;

blades 6-15(30) cm long, 3.5-8.5(13) mm wide, glabrous adaxially, rarely hirsute, with papillose-based hairs basally, margins scabridulous.

= 36, 54.

= 18, 34, 36, 45, 54, 72(?).