Flora of North America species comparison

5-60 cm, erect to decumbent.

2-15 cm, erect or decumbent.

2.5-20 cm, diffuse at maturity, lower branches horizontal to descending, spikelets usually confined to the distal 2/3, pedicels scabrous, lacking tumid epidermal cells.

usually not developed, if developed, 1-7 cm, diffuse, lower branches ascending, spikelets usually confined to the distal 1/3;

pedicels scabrous, usually with tumid epidermal cells.

2.5-7 mm, with 2-7 florets.

6-9 mm, with 3-6(7) florets.

rounded over the back, veins obscure, apices acute to truncate;

lower glumes 0.4-1.3 mm;

upper glumes 0.9-1.8 mm;

calluses with a few hairs;

lemmas 1.5-2(2.2) mm, mostly herbaceous, glabrous or sparsely hairy on the lower 1/2, principally along the veins, backs rounded, 5-veined, veins obscure, not extending to the margins, apical margins hyaline and often yellowish, uniformly and densely scabrous, apices widely obtuse to truncate, entire;

palea veins shortly ciliate proximally, glabrous, sometimes scabrous distally;

anthers 0.4-0.8 mm.

rounded or slightly keeled over the back, veins obscure or distinct, apices acute or obtuse;

lower glumes 1.5-2.2 mm;

upper glumes 2.3-2.8 mm;

calluses glabrous or almost so;

lemmas 3.2-3.8(4.5) mm, membranous, usually glabrous, occasionally sparsely hairy, backs rounded, 5-veined, veins obscure, not extending to the margins, apices acute or rounded, apical margins whitish, hyaline, smooth, entire;

palea veins glabrous;

anthers (1.5)2-2.5 mm, aimost always indehiscent, mature pollen rarely produced.

rarely developed.

0.8-1.2 mm, obtuse to truncate, usually entire;

blades 1-7 mm wide, flat to involute.

0.4-1.5 mm, acute, obtuse, or truncate, entire;

blades 0.4-2.2 mm wide when flat, 0.2-1 mm in diameter when involute.

= 14, 28, 42.

= 21, 28.