Flora of North America species comparison

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

20-70 cm, erect;

nodes glabrous or pubescent.

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.

mainly cauline;

sheaths glabrous or sparsely to densely pubescent, sometimes with papillose-based hairs;

ligules 0.5-2.2 mm, entire to lacerate;

blades 1.3-7.7 cm long, 1.5-4.7 mm wide, glabrous or sparsely to densely pubescent.

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.

simple, 4.5-20 cm long, 5.5-31 cm wide, open;

branches divergent;

lower primary branches 3.6-17.7 cm, often with 1-several sterile branches near the base;

pedicels divergent, spikelets solitary.

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

2.3-3.3 mm long, 0.6-1 mm wide, narrowly elliptic.

1.3-1.6 mm.

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 0.1-0.4 mm;

upper glumes 1.8-2.9 mm, 3-veined, densely pubescent between the veins, hairs white, becoming purple at maturity;

lower lemmas similar to the upper glumes in length, texture, and pubescence, 5-veined, veins equidistant;

upper lemmas 1.9-2.6 mm, glabrous, dark brown, narrowly acute;

anthers 0.3-0.5 mm, yellow, red, or purple.

= 36.

= (36), 72.