Flora of North America species comparison

(3)10-50(80) cm, often highly branched above the base.

30-80(100) cm, erect, unbranched.

cauline, glabrous;

sheaths shorter than the internodes, not disintegrating into threadlike fibers;

ligules 0.4-1 mm;

blades 2-14 cm long, 1-2.5 mm wide, flat to involute.

mostly basal;

sheaths usually longer than the internodes, mostly glabrous, throat sometimes with hairs, not disintegrating into threadlike fibers;

collars glabrous or with hairs at the sides;

ligules 0.2-0.4 mm;

blades 10-25(30) cm long, 1-3 mm wide, usually flat, often curling like wood shavings when mature, glabrous.

panicles, 5-15(20) cm long, 0.5-3 cm wide, often interrupted below;

nodes glabrous or with straight, less than 0.5 mm hairs;

primary branches 1-4 cm, erect to ascending, without axillary pulvini, with 3-8 spikelets.

spikelike panicles, 10-25 cm long, 1-3 cm wide;

nodes glabrous or with straight, about 0.5 mm hairs;

primary branches 2-6 cm, appressed, without axillary pulvini, with 2-8 spikelets.

crowded.

unequal, 1-veined, acuminate;

lower glumes 4-8 mm;

upper glumes 6-11 mm;

calluses 0.5-0.8 mm;

lemmas 6-9 mm, slightly keeled, midveins scabrous, junction with the awns not evident;

awns not disarticulating at maturity, flattened and straight to somewhat curved at the base, central rib flanked by equally wide pale wings;

central awns 7-15(20) mm;

lateral awns somewhat shorter, occasionally only 1-2 mm;

anthers 3, 0.3-0.7 mm.

10-15(18) mm, brownish, acuminate to awned, awns to 3 mm;

lower glumes slightly shorter than to equaling the upper glumes, 1-2-veined;

calluses 1-1.8 mm;

lemmas 12-18 mm, glabrous, rarely sparsely pilose, terminating in a 3-6 mm twisted column, junction with the awns not conspicuous;

awns 20-35 mm, straight to curved basally, ascending distally, not disarticulating at maturity;

central awns 20-35 mm;

lateral awns slightly shorter than the central awns;

anthers 3, 1.3-1.9 mm.

= 22.

= 22.