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, 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.

mainly cauline;

basal sheaths villous;

upper sheaths glabrous or sparsely to densely hirsute, hairs papillose-based;

ligules (1)1.5-4 mm, entire to lacerate;

blades 5-15 cm long, 1-4 mm wide, glabrous or sparsely pubescent.

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 4-10 spikelike primary branches on (4)10-18 cm rachises;

primary branches 4-10 cm, usually divergent at maturity, varying to ascending, axes not wing-margined, bearing spikelets in unequally pedicellate pairs;

internodes (4.5)6-15 mm (mid-branch);

secondary branches rarely present;

shorter pedicels 2-2.5 mm;

longer pedicels 7-8 mm;

terminal pedicels of primary branches 7.4-20 mm.

1.3-2.8 mm.

homomorphic, 3.7-5.8 mm (including pubescence), 2.9-4.3 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.

0.3-0.5 mm;

upper glumes 2.4-3.5 mm (excluding pubescence), 3-veined, densely villous, hairs 1.5-4 mm, silvery-white to purple, spreading at maturity;

lower lemmas 2.8-4.2 mm (excluding pubescence), exceeding the upper lemmas by 0.8-2.2 mm, 5-veined and the veins equally spaced or 7-veined and the lateral veins closer to each other than to the central vein, margins densely villous, hairs 1.5-4 mm, silvery-white to purple, spreading at maturity, apices acuminate;

upper lemmas 2.6-3.2 mm, lanceolate, brown when immature, dark brown at maturity, acuminate.

, pers.

.).

= 36, 54.

= 72.