Flora of North America species comparison

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

80-120 cm, erect or decumbent and rooting at the lower nodes, not branching at the aerial nodes.

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.

hirsute, with papillose-based hairs, those of the innovation sheaths compressed-keeled;

ligules 1-2 mm;

blades 7-30 cm long, 3-5 mm wide, flat, pilose above and below.

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 6-8 spikelike primary branches on 4-6 cm rachises;

primary branches 8-13 cm, axes triquetrous, narrowly winged, wings less than 1/2 as wide as the midribs, lower and middle portions of the branches bearing spikelets in appressed, unequally pedicellate pairs;

secondary branches rarely present;

axillary inflorescences not present;

pedicels not adnate to the branch axes.

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

about 3 mm, elliptic lanceolate, acute.

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 minute and hyaline;

upper glumes 7-9-veined, glabrous or obscurely pubescent;

lower lemmas 7-9-veined, glabrous or obscurely pubescent;

upper lemmas elliptic, yellow or gray, becoming purple at maturity, slightly apiculate.

= 36.

= unknown.