Flora of North America species comparison

10-100 cm, usually erect.

7-40 cm, erect to ascending.

either concentrated at the base or distributed along the culms;

ligules 1-3 mm, obtuse, usually entire, sometimes slightly erose;

blades 1-4 mm wide, flat to involute.

5-30 cm, compact to diffuse at maturity, usually distinctly exserted from the sheaths, lower branches usually erect to diverging, occasionally descending, spikelet-bearing from the base or on the distal 2/3;

pedicels scabrous, lacking tumid epidermal cells.

2-13 cm, compact to diffuse at maturity, lower branches erect to descending, spikelet-bearing from near the base or confined to the distal 1/2;

pedicels smooth or with a few scattered scabrules, sometimes with tumid epidermal cells.

3.5-9 mm, with 2-7 florets.

3-8 mm, with (1)2-5 florets.

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

lower glumes 0.5-1.5 mm, usually less than 1/2 as long as the adjacent lemmas;

upper glumes 1-2.8 mm;

rachilla internodes slightly and gradually broadened to the point of attachment with the lemmas;

calluses with a few hairs;

lemmas (2)2.2-3(3.5) mm, herbaceous, glabrous or sparsely hairy on the proximal 1/2, principally along the veins, backs rounded, 5-veined, veins obscure, not extending to the margins, smooth distally, lateral margins inrolled or not, apical margins uniformly and densely scabrous, apices acute to obtuse, entire;

palea veins glabrous, short-ciliate, or with a few long hairs proximally, smooth or scabrous distally;

anthers 0.6-2 mm.

rounded or weakly keeled over the back, veins obscure, apices acute to obtuse;

lower glumes 0.8-1.9 mm;

upper glumes 1.7-2.5 mm;

calluses with a few hairs;

lemmas 2.4-3.3 mm, herbaceous, glabrous or with a few hairs near the base, principally along the veins, backs rounded or weakly keeled distally, 5-veined, veins obscure, not extending to the margins, apical margins uniformly and densely scabrous, apices acute to obtuse, entire;

palea veins smooth and glabrous proximally, smooth or scabrous distally;

anthers 1.5-2 mm.

1.5-2.7 mm, obtuse, entire or minutely and irregularly serrate;

blades involute, 1.4-2.2 mm wide when flattened.

= 28, 42, 56.

= unknown.