Flora of North America species comparison

cauline;

sheaths usually shorter than the internodes, lowermost sheaths appressed-pilose basally;

collars glabrous;

ligules less than 0.5 mm;

blades usually 4-12 cm long, 0.5-1.5 mm wide, flat or loosely involute, somewhat lax, glabrous or scabridulous, pale 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.

spicate or racemose, (5)7-20 cm long, 2-4 cm wide;

primary branches rarely developed.

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.

divergent, pedicels with axillary pulvini.

appressed, only slightly overlapping.

unequal, glabrous, brownish-green with a purple tinge;

lower glumes (9)12-22(28) mm, 3-7-veined, midvein extended into a 1-13 mm awn between 2 delicate setae;

upper glumes (7)11-20(24) mm, 1-veined;

calluses 0.5-2 mm;

lemmas (9)12-22(23) mm, glabrous, light-colored, often mottled;

awns (8)12-65(70) mm, subequal, spreading;

anthers usually 1 and less than 0.5 mm, rarely 3 and 3-4 mm.

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.

8-14 mm, brown.

6-7 mm, light chestnut brown.

25-55 cm, erect or geniculate at the base, highly branched.

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

= 22.

= unknown.