Flora of North America species comparison

mostly basal;

sheaths longer than the internodes, glabrous except at the summit;

collars densely pilose;

ligules 0.5-1 mm;

blades 5-20 cm long, 1-2 mm wide, flat to loosely involute, glabrous.

cauline;

sheaths usually shorter than the internodes, lowermost sheaths appressed-pilose basally;

collars glabrous;

ligules less than 0.5 mm;

blades usually 4-12 cm long, 0.5-1.5 mm wide, flat or loosely involute, somewhat lax, glabrous or scabridulous, pale green.

paniculate, 8-18 cm long, 4-12 cm wide, peduncles often flattened and easily broken;

rachis nodes glabrous or with straight, less than 0.3 mm hairs;

primary branches 2-6 cm, stiffly divaricate to reflexed, with axillary pulvini, usually naked on the lower 1/2 secondary branches usually absent.

spicate or racemose, (5)7-20 cm long, 2-4 cm wide;

primary branches rarely developed.

usually divergent, pedicels usually with axillary pulvini.

divergent, pedicels with axillary pulvini.

8-12 mm, 1-veined, acuminate or awned, awns to 4 mm;

calluses about 0.5 mm;

lemmas 8-13 mm long, glabrous, smooth or scabrous, terminal 2-3 mm straight or with 1-2 twists, narrowing to 0.1-0.2 mm wide, junction with the awns not evident;

awns (7)10-22 mm, not disarticulating at maturity, from almost straight to somewhat curved basally, ascending to divergent distally;

lateral awns slightly shorter and thinner than the central awns;

anthers 3, 0.8-1 mm.

unequal, glabrous, brownish-green with a purple tinge;

lower glumes (9)12-22(28) mm, 3-7-veined, midvein extended into a 1-13 mm awn between 2 delicate setae;

upper glumes (7)11-20(24) mm, 1-veined;

calluses 0.5-2 mm;

lemmas (9)12-22(23) mm, glabrous, light-colored, often mottled;

awns (8)12-65(70) mm, subequal, spreading;

anthers usually 1 and less than 0.5 mm, rarely 3 and 3-4 mm.

8-10 mm, light brown.

8-14 mm, brown.

15-40 cm, slender, usually erect, occasionally decumbent, often tightly clustered into hemispheric clumps, unbranched.

25-55 cm, erect or geniculate at the base, highly branched.

= 22.

= 22.