Flora of North America species comparison

45-80 cm, erect, usually unbranched.

60-100 cm, erect, 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;

sheaths longer than the internodes, glabrous, basal sheaths many-veined, shredding into threadlike segments at maturity;

collars glabrous or sparsely pilose at the corners;

ligules 0.1-0.2 mm;

blades 10-55 cm long, 1-3 mm wide, flat to folded, glabrous, pale green to yellow-green, central veins separate and narrow, without a well-defined midrib, lateral veins forming a thickened region on each margin.

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.

paniculate, (10)20-45 cm long, 2-6 cm wide;

nodes glabrous;

primary branches (2)4-15 cm, basal branches appressed, without axillary pulvini, distal branches ascending, occasionally lax or drooping distally.

appressed or with axillary pulvini and spreading.

appressed.

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.

unequal, brown to chestnut, 1-veined, awned;

lower glumes 6-12 mm, awns 2-5 mm;

upper glumes 13-18 mm, awns 3-6 mm;

calluses 0.4-0.8 mm;

lemmas 9-13 mm long, narrowing to a poorly defined beak 1-2 mm long and 0.2—0.3 mm wide, glabrous, tan to brown, junction with the awns not conspicuous;

awns usually unequal, not disarticulating at maturity;

central awns 15-30 mm, curved to semicircular at the base, horizontal to reflexed distally;

lateral awns 13-20 mm, at least 1/2 as long as the central awns, curved or loosely twisted at the base, straight and strongly divergent distally;

anthers 3, about 4 mm, yellow.

5-8 mm.

6-8 mm, tan to brown.

= unknown.

= unknown.