Flora of North America species comparison

(7) 35-150 cm, erect, not rooting at the lower nodes.

50-125 cm.

mostly basal, sometimes forming a dense 10-35 cm tuft;

sheaths glabrous;

ligules 2-13 mm, scarious, decurrent, obtuse to acute;

blades 5-30 cm long, usually at least some flat and 1-4 mm wide, the remainder folded or rolled and 0.5-1 mm in diameter, adaxial surfaces with 5-11 prominent ribs, ribs usually all papillose, scabridulous, or scabrous, sometimes puberulent, outer ribs sometimes more strongly so than the inner ribs.

8-30(40) cm, 4-30 cm wide, usually open and pyramidal, sometimes contracted and ovate;

branches straight to slightly flexuous, usually strongly divergent, sometimes strongly ascending, lower branches often scabridulous or scabrous, particularly distally, with not or only moderately imbricate spikelets.

10-25 cm long, 3-8 cm wide, dense;

primary and secondary branches appressed to ascending, scabridulous to densely scabrous.

2.5-7.6 mm, ovate to V-shaped, laterally compressed, usually bisexual, sometimes viviparous, bisexual spikelets usually with 2(3) florets, rarely with 1.

5.5-8 mm, usually strongly imbricate.

lanceolate, acute;

lower glumes 2.7-7 mm, entire, 1-3-veined, midvein sometimes scabridulous, at least distally;

upper glumes 2-7.5 mm, 1-3-veined, lanceolate, midvein smooth or wholly or partly scabridulous;

callus hairs 0.2-2.3 mm;

lemmas 2-5(7) mm, smooth, shiny, glabrous, usually purple over less than 1/2 their surface, purple or green proximally, if green, often with a purple band about midlength, usually green or pale distally, usually awned, awns (0.5)1-8 mm, attached from near the base to about midlength, straight or geniculate, sometimes exceeding the glumes;

anthers 1.5-3 mm.

usually exceeded by the distal floret, often purplish over more than 1/2 their area;

lower glumes 4.6-5.8 mm, midveins scabrous distally;

upper glumes 4.5-5.6 mm;

callus hairs 1-2.3 mm;

lemmas 3.8-4.5 mm, often purplish over more than 1/2 their area, awns 2-3 mm, straight to slightly geniculate, attached near or slightly above the middle of the lemma;

anthers 2.5-3 mm.

0.5-1 mm.

voucher specimens for these counts have not been examined.

3-4.3 mm;

blades 15-30 cm long, 1-4 mm wide when flat.

= 18, 24, 25, 26-28, about 39, 52.

= 26.