Flora of North America species comparison

45-80 cm, erect, usually unbranched.

10-100 cm, erect to ascending, usually unbranched.

basal and cauline;

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

collars densely pilose, hairs 1-3 mm, cobwebby and tangled, often deflexed;

ligules less than 0.5 mm;

blades 5-15 cm long, about 0.5 mm wide, usually involute, occasionally loosely folded, glabrous, light green.

mostly basal or mostly cauline;

sheaths shorter or longer than the internodes, glabrous, not disintegrating into threadlike fibers at maturity;

collars glabrous, or sparsely pilose at the sides with straight hairs;

ligules less than 0.5 mm;

blades 4-25 cm long, 1-1.5 mm wide, tightly involute to flat, usually glabrous, sometimes scabridulous abaxially, gray-green, lax to curled at maturity.

paniculate, 12-20 cm long, 2-8 cm wide;

primary branches 2-5 cm, erect to horizontal, with or without axillary pulvini, with 1-5 spikelets.

usually sparingly branched panicles, occasionally racemes, 3-30 cm long, 2-12 cm wide, with 2 or more spikelets per node;

nodes glabrous or with straight, about 0.5 mm hairs;

primary branches 3-6 cm, appressed to divaricate, varying sometimes within a panicle, stiff to flexible, bases appressed or abruptly spreading, usually without axillary pulvini.

appressed or with axillary pulvini and spreading.

divergent or appressed, with or without axillary pulvini.

6-10(12) mm, equal or the lower glumes slightly shorter, 1-veined, brownish;

calluses about 0.5 mm;

lemmas (6)7-14(16) mm, mostly smooth, mottled, terminating in a 2-4 mm, usually twisted, scabrous beak;

central awns 5-10 mm, sharply curved at the base, spreading distally;

lateral awns absent or to 3 mm, erect;

anthers 3, about 1.5 mm, brown.

usually unequal, lower glumes shorter than the upper glumes, sometimes subequal, light to dark brown or purplish, glabrous, smooth or scabridulous, 1(2)-veined, acuminate, unawned or awned, awns to 1 mm;

lower glumes 4-12 mm;

upper glumes 7-25 mm;

calluses 0.5-1.8 mm;

lemmas 6-16 mm, glabrous, scabridulous, or tuberculate, whitish to purplish, apices 0.1-0.8 mm wide, not beaked or the beak less than 3 mm, junction with the awns not conspicuous;

awns (8)13-140 mm, ascending to divaricate, not disarticulating at maturity;

central awns thicker than the lateral awns;

lateral awns (8)13-140 mm, usually subequal to the central awns, occasionally less than 1/3 as long as the central awns;

anthers 3, 0.7-2 mm.

5-8 mm.

6-14 mm, tan to chestnut.

= unknown.

= 22, 44, 66, 88.