Flora of North America species comparison

60-120 cm, stiffly erect, unbranched.

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

basal or nearly basal;

sheaths shorter than the internodes, smooth and mostly glabrous abaxially, sometimes with a line of widely spaced, 0.5-1 mm hairs over the midvein, not disintegrating into threadlike fibers at maturity;

collars glabrous, sometimes with a few conspicuous hairs at the sides;

ligules 0.1-0.3 mm;

blades 15-50 cm long, 0.3-1 mm wide, tightly involute, stiff, yellow-green, abaxial surfaces villous on both sides of the midvein, at least on the basal portion, hairs 0.6-1.5 mm, adaxial surfaces densely scabrous or densely short pubescent.

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.

paniculate, 20-35 cm, 5-8 mm wide;

nodes glabrous;

primary branches 2-5 cm, appressed, without axillary pulvini, with 4-12 spikelets, spikelet-bearing to the base.

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.

appressed.

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

subequal, glabrous, light brown or tan, usually 1(2)-veined, bifid and awned, awns 1.5-2.5 mm;

lower glumes 7-10 mm;

upper glumes 6-9 mm;

calluses 0.4-0.6 mm;

lemmas 6-9 mm, glabrous, light-colored when young, reddish when mature, column 1-2 mm, not twisted, junction with the awns inconspicuous;

awns (7)10-15(22) mm, subequal, usually horizontally spreading or curving downward, not disarticulating at maturity;

anthers 3, about 3 mm, reddish-brown.

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.

4-5 mm, chestnut brown.

light brown.

= unknown.

= unknown.