Flora of North America species comparison

45-80 cm, erect, usually unbranched.

25-45 cm, erect, branching at most nodes.

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.

cauline;

sheaths shorter than the internodes, glabrous or sparsely pilose;

ligules about 0.3 mm;

blades 3-8 cm long, 1-1.5 mm wide, flat to folded, becoming involute in age, adaxial surfaces with scattered pilose hairs, pale green.

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.

racemose or paniculate, (2)4-10 cm long, 1-2 cm wide, with few (sometimes only 1 or 2) spikelets;

primary branches weakly developed, to 2 cm, appressed, with 1-3 spikelets.

appressed or with axillary pulvini and spreading.

appressed, only slightly overlapping.

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.

1-veined, acute, awned, awns 1-2 mm, brown to purplish;

upper glumes 10-12 mm;

lower glumes 1-2 mm shorter;

calluses 0.4-0.6 mm;

lemmas 8-9 mm, light gray, mottled;

awns erect to divergent;

central awns 10-15 mm, with 2-3 spiral coils at the base;

lateral awns 5-10 mm, not coiled but often curved and twisted basally, strongly divergent distally;

anthers 3, about 3 mm, purplish-brown.

5-8 mm.

6-7 mm, light chestnut brown.

= unknown.

= unknown.