Flora of North America species comparison

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

15-60 cm, erect or geniculate at the base, branching at most of the nodes.

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.

cauline;

sheaths usually shorter than the internodes, glabrous or sparsely pilose;

collars glabrous;

ligules less than 0.5 mm;

blades 3-10 cm long, 1-2 mm wide, flat to folded basally, involute distally, scabridulous on both surfaces, occasionally sparsely pilose adaxially, light green.

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.

paniculate or racemose, 2-11 cm long, to 1 cm wide;

nodes glabrous or strigillose;

primary branches 1-2 cm, appressed, without axillary pulvini, with 1-2 spikelets.

crowded.

partly overlapping, often in pairs, 1 spikelet subsessile, the other pedicellate.

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.

1-veined, light gray to dark purplish or brownish;

lower glumes 3-8(10) mm, from 1/2 as long as the upper glumes to nearly equaling them;

upper glumes 4-13 mm;

calluses 0.3-0.5 mm;

lemmas 3-11 mm, light gray to purplish, frequently mottled, midveins scabrous, elsewhere glabrous, scabridulous, or sparsely appressed-puberulent, junction with the awns not evident;

central awns 3-8 mm, coiled at the base, spreading distally;

lateral awns 1-4 mm, straight, erect;

anthers 3 and 2-3 mm, or 1 and about 0.25 mm.

light brown.

= 22.

= unknown.