Flora of North America species comparison

80-130 cm, erect, with densely villous cataphylls, branching from the lower and middle nodes.

20-60 cm, glabrous, decumbent, rooting and branching from the lower nodes, geniculate above.

usually sparsely to densely papillose-hirsute, occasionally glabrous;

ligules 4-6 mm, usually lacerate, not ciliate;

blades 20-50 cm long, 10-17 mm wide, lax, smooth or scabridulous abaxially, scabridulous to scabrous adaxially.

glabrous or with long hairs near the base;

ligules 0.8-2.5 mm;

blades 2-13.5 cm long, 1.5-2.5 mm wide, glabrous on both surfaces or the adaxial surface with a few long hairs near the base.

20-35 cm long, 2-10 cm wide, with numerous spikelike primary branches;

primary branches 10-15 cm, appressed to ascending at maturity, axes not wing-margined or with wings less than 1/2 as wide as the midribs;

internodes 3-4.5(6) mm (midbranch), bearing spikelets in unequally pedicellate pairs;

secondary branches rarely present;

pedicels not adnate to the branches;

shorter pedicels 0.7-2 mm;

longer pedicels 2.5-5 mm;

terminal pedicels 2-5 mm.

with 3-8 spikelike primary branches, these digitate or with rachises to 2 cm long;

lower panicle nodes with hairs at least 0.4 mm;

primary branches 4-15.5(20) cm long, 0.4-0.8 mm wide, axes wing-margined, wings more than 1/2 as wide as the midribs, proximal portions of the branches often with scattered 1-4 mm hairs, bearing spikelets in unequally pedicellate pairs on the lower and middle portions of the branches;

secondary branches absent;

pedicels not adnate to the branches.

5.5-8.2 mm (including pubescence), 4.2-5.9 mm (excluding pubescence), narrowly ovate, acuminate.

homomorphic, 1.7-2.8 mm long, 0.5-0.8 mm wide.

glumes 0.6-0.8 mm;

upper glumes 3.5-4.5 mm, 3-5-veined, pubescent on the margins;

lower lemmas 4.1-5.7 mm (exceeded 1.5-5 mm by pubescence), narrowly ovate, 7-veined, pubescent between most, sometimes all, of the veins and on the margins, veins usually obscured by a dense covering of golden-brown hairs, hairs 3-6 mm, spreading at maturity, intercostal regions on either side of the midvein glabrous or pubescent with shorter, fine, white hairs, sometimes intermixed with the golden-brown hairs;

upper lemmas 3.2-4.5 mm, narrowly ovate, brown when immature, dark brown at maturity, acuminate;

anthers 1-1.2 mm.

glumes absent or to 0.2 mm;

upper glumes 1-2.2 mm, 0.4-0.8 times as long as the spikelets;

lower lemmas about as long as the spikelets, 7-veined, veins smooth, lateral veins usually equally spaced, sometimes the inner lateral veins more distant from the other 2, intercostal regions adjacent to the midveins glabrous, those between the lateral veins with 0.5-1 mm hairs, hairs initially appressed, sometimes strongly divergent at maturity;

upper lemmas yellow to gray when immature, becoming brown at maturity;

anthers 0.3-0.6 mm.

= 36.

= unknown.