Flora of North America species comparison

10-75 cm, about 1 mm thick, simple or with erect basal branches;

nodes densely pilose, hairs ascending;

internodes glabrous or shortly pubescent distally.

40-120 cm tall, 2-3 mm thick, decumbent to erect, branching from the base and the middle nodes;

nodes pilose, hairs spreading;

internodes hirsute, hairs papillose-based.

longer than the internodes, green to purplish, hispid, margins sparsely ciliate;

ligules 0.5-1.5 mm;

blades 3-32 cm long, 1-7 mm wide, ascending to erect, linear, narrowing basally, flat or the margins involute, surfaces sparsely hirsute or pilose (rarely glabrous), hairs near the base papillose-based, margins prominent, apices acute.

usually shorter than the internodes, hirsute, lower sheaths more so than those above, hairs papillose-based;

collars densely pilose;

ligules 0.5-4 mm;

blades 16-55 cm long, 0.5-14 mm wide, erect to ascending, abaxial surfaces hirsute, hairs papillose-based, adaxial surfaces densely pilose, midveins prominent and whitish, bases truncate, margins ciliate basally, apices attenuate.

5-45 cm long, 1-6 cm wide, at least 1/2 as long as the plants and 3 times longer than wide, open;

rachises glabrous;

primary branches usually alternate or subopposite, ascending to slightly divergent, secondary branches and pedicels attached to the distal 2/3;

secondary branches diverging;

pedicels 0.5-17 mm, ascending to appressed.

2.5 - 3.7 mm long, 0.6-1.1 mm wide, narrowly ovoid, glabrous, acute;

lower glumes 0.8-1.3 mm, 1/3 – 1/2 as long as the spikelets, acuminate;

upper glumes 2.3-3.3 mm, 7-9-veined, exceeding the upper florets by about 0.6 mm;

lower florets sterile;

lower lemmas 2.2-2.7 mm, exceeding the upper florets by about 0.6 mm, 7- or 9-veined, apices scabridulous, pointed;

lower paleas absent;

upper florets 1.6-1.7 mm long, about 0.6 mm wide, usually smooth, usually pale, sometimes becoming dark at maturity.

2.6-3.4 mm long, 0.9-1.2 mm wide, ovoid, glabrous.

1.4-1.7 mm, to 1/2 as long as the spikelets, acute, 5-7-veined;

upper glumes and lower lemmas similar, exceeding the upper florets by 0.7-0.9 mm, 9-13-veined;

lower florets sterile;

lower paleas 0.5-1.3 mm;

upper lorets 1.7-2.3 mm long, 0.8-1.1 mm wide, smooth, ovoid.

panicles 7-35 cm long, 5-23 cm wide, about 1/2 as wide as long, shortly exerted or partially included, lax, open;

axillary panicles smaller, included basally;

primary branches diverging, lower branches solitary, upper branches solitary to subverticillate;

secondary branching primarily in the distal 1/3;

pedicels 1-4 mm, clavate, spreading to appressed.

= 18.

= unknown.