Flora of North America species comparison

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

30-56 cm, erect;

nodes glabrous.

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 0.2-1.5 mm, entire to lacerate;

blades 2.4-12.6 cm long, 2-5.4 mm wide, glabrous or 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, 12.8-27.5 cm long, 16.5-44.5 cm wide, open;

branches divergent;

lower primary branches 10.5-24 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.

2.2-3.1 mm long, 0.7-1.1 mm wide, obovate or broadly 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 0.1-0.8 mm;

upper glumes 1.8-2.8 mm, 3(5)-veined, glabrous or pubescent between the veins, hairs appearing as a narrow stripe;

lower lemmas similar to the upper glumes in length, texture, and pubescence, 7-veined, veins unequally spaced, lateral veins closer together than the 3 central veins;

upper lemmas 1.9-2.9 mm, glabrous, dark brown, narrowly acute;

anthers 0.5-0.7 mm, yellow or purple.

= 36.

= 36.