Flora of North America species comparison

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

(10)30-120 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.

sometimes forming a basal tuft;

sheaths glabrous;

ligules 2.5-8(9) mm, acute to acuminate;

blades 7-30 cm long, 0.2-2 mm wide, usually involute.

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.

5-30(35) cm long, 0.5-1.5(2) cm wide, erect or nodding;

branches erect to ascending.

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.

3-6.7 mm, bisexual, narrowly V-shaped, appressed to the branches.

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.

equaling or exceeding the florets, narrowly lanceolate, usually pale green, sometimes purple-tipped, 3-veined, acuminate;

lower glumes (3)3.2-5.5(6.7) mm;

upper glumes (3)3.1-5.4(6) mm;

callus hairs 0.3-1.15 mm;

lemmas 1.7-4.3 mm, smooth, shiny, glabrous, apices weakly toothed or erose, awns 1.5-5.5(6) mm, straight to slightly geniculate, attached from slightly below to slightly above the middle of the lemma, exceeding the florets by 1-2.5 mm;

anthers 0.3-0.5(0.7) mm.

0.5-1 mm.

voucher specimens for these counts have not been examined.

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

= 26.