Flora of North America species comparison

11-110 cm, erect to decumbent;

nodes shortly hirsute or glabrous.

20-60 cm tall, 0.8-1.2 mm thick, shortly decumbent to geniculate basally, erect distally;

nodes glabrous;

internodes glabrous.

shorter than the internodes, greenish to purplish, glabrous or with papillose-based hairs, ciliate on 1 margin, glabrous on the other;

collars hirsute;

ligules 1.5-3.5 mm, of hairs;

blades 3-30 cm long, 3-30 mm wide, flat, usually hirsute or sparsely pubescent, hairs papillose-based, sometimes glabrous, bases rounded to cordate-clasping, margins ciliate, cilia papillose-based, apices acute.

shorter or longer than the internodes, rounded, smooth, glabrous;

ligules about 1 mm;

blades 5-15 cm long, 2-8 mm wide, flat, linear, glabrous or with a few marginal cilia near the base, bases contracted, apices long-acute.

9-30 cm long, 5-8 cm wide, erect or nodding, partially included to well-exserted, rachises glabrous or sparsely hispid basally;

primary branches usually alternate to opposite, divergent, secondary branches and pedicels confined to the distal 2/3;

pulvini inconspicuous;

secondary branches appressed;

pedicels 9-27 mm, appressed.

10-20 cm long, 6-12 cm wide, exserted or partially included;

primary branches alternate, ascending to strongly divergent, developing secondary branches in the basal 1/3 – 1/2, pedicels 4-9 mm, ascending.

1.9-4 mm long, 0.8-1 mm wide, ovoid to almost spherical, often reddish-brown, glabrous, veins prominent, scabridulous, apices abruptly acuminate.

2.7-3.2 mm long, 1-1.2 mm wide, ovoid-ellipsoid, green tinged with purple, glaucous, glabrous, acute.

1.3-2.4 mm, 1/2 - 3/4 as long as the spikelets, 3-5-veined;

upper glumes 1.8-3.3 mm, 7-11-veined;

lower florets sterile;

lower lemmas similar to the upper glumes, 9-veined;

lower paleas 0.4-0.9 mm;

upper florets 1.5-2.4 mm long, 0.4-0.8 mm wide, ellipsoid, smooth or conspicuously papillate, shiny, stramineous, often with a lunate scar at the base.

0.7-1.1 mm, about 2/5 as long as the spikelets, acute to attenuate;

upper glumes and lower lemmas similar, equaling the spikelets, 11-13-veined, tapering to apiculate apices;

lower paleas 1-2 mm;

lower florets sterile;

upper florets about 2.2 mm, ellipsoid, smooth, shiny, yellow at maturity, apices acute.

= 54.