Flora of North America species comparison

to 100 cm, often decumbent or stoloniferous, freely branching;

nodes bearded.

to 70 cm, erect, sparingly branched;

nodes glabrous or hirsute, hairs about 1 mm.

mostly basal, green, sometimes glaucous;

sheaths glabrous, keeled;

ligules 0.7-1.5 mm;

blades 3-15 cm long, 3-4 mm wide, flat, margins and ligule regions hairy.

cauline, glaucous;

ligules 1-2 mm;

blades 15-25 cm long, 3-7 mm wide, glabrous.

3-5 cm, fan-shaped, often purplish;

rachises 0.2-2 cm, with 3-8 branches;

branches 3-4.5 cm, longer than the rachises, usually with 1 rame;

rame internodes with villous margins, with 1-3 mm hairs.

5-6 cm, oblong to fan-shaped;

rachises 1-3 cm, with 4-5 branches;

branches 4-6 cm, lacking axillary pulvini, with 1 rame;

rame internodes with stiff, 1-3 mm marginal hairs.

spikelets 3-4 mm, lanceolate;

callus hairs about 1 mm;

lower glumes sparsely hirtellous, with a prominent dorsal pit near the middle;

awns 10-17 mm;

anthers 1-1.8 mm, yellow.

spikelets 5.5-7 mm, lanceolate-elliptic;

lower glumes glabrous, usually without a dorsal pit;

awns 10-15 mm, twisted, once-geniculate;

anthers about 3 mm.

spikelets the same size as the sessile spikelets, sterile, pitted or not, occasionally with 2 pits.

spikelets staminate, subequal to the sessile spikelets.

= 40, 60.

= 120.