Flora of North America species comparison

60-120 cm, stiffly erect, unbranched.

20-60 cm, wiry.

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, mostly glabrous, sparsely hairy near the summit;

collars hispidulous, occasionally glabrous;

ligules 0.2-0.5 mm;

blades 3-22 cm long, to 2 mm wide, flat to involute, glabrous abaxially, sparsely pilose adaxially, without a prominent midrib but with a thickened vein near each margin, pale to gray-green, sometimes slightly glaucous.

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, 5-12 cm long, 2-4 cm wide;

primary branches barely developed.

appressed.

appressed to slightly divergent from the axillary pulvini.

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.

subequal, apices bifid, awned from the sinuses;

lower glumes (9)11-16 mm, 3-7-veined, awns 0.5-2(4) mm;

upper glumes 11-18 mm, 1-3-veined, awns 3-7 mm;

calluses 0.4-1 mm;

lemmas (8)15-20(22) mm, dark, occasionally banded or spotted, apices narrowed but not beaklike;

central awns 12-25 mm, bases with a semicircular bend;

lateral awns 1-4 mm, erect, occasionally lacking;

anthers 3, about 3 mm, brown.

4-5 mm, chestnut brown.

9-11 mm, dark brown to black.

= unknown.

= unknown.