Flora of North America species comparison

(30)45-80 cm, branching at the lower nodes, often diffusely so;

nodes and internodes glabrous.

20-60 cm, wiry.

cauline;

sheaths shorter or slightly longer than the internodes, glabrous or with straight hairs, sometimes pilose-floccose;

collars glabrous or pilose at the sides;

ligules about 0.5 mm;

blades (6)10-20 cm long, 1-2(3) mm wide, yellow-green, turning reddish late in the season, involute to loosely folded, abaxial surfaces smooth or scabrous near the base, sometimes pubescent distally, adaxial surfaces usually glabrous, sometimes scabrous or pubescent, lateral veins about twice as thick as the inner veins.

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, 10-20 cm long, 2-7 cm wide;

rachis nodes glabrous;

primary branches stiffly ascending, with axillary pulvini, with 3-9 spikelets.

paniculate or racemose, 5-12 cm long, 2-4 cm wide;

primary branches barely developed.

in fan-shaped clusters, pedicels with axillary pulvini.

appressed to slightly divergent from the axillary pulvini.

10-17 mm, about equal, light to dark brown, glabrous or rarely sparsely pilose, 1-veined, apices cleft and awned, awns 2-5 mm;

calluses 1-2.5 mm;

lemmas 7-10 mm, gray to light brown, narrowing to a 2-5(7) mm beak, junction of the lemma and awns evident;

awns 20-28 mm, similar in length, curved to strongly arcuate near the base, not forming a column, straight and divergent distally, disarticulating at maturity;

anthers 3, 1-2 mm, dark purple.

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.

7-8 mm, smooth, chestnut brown.

9-11 mm, dark brown to black.

= unknown.

= unknown.