Flora of North America species comparison

10-40 cm, highly branched above the base in age;

internodes glabrous or pubescent, sometimes nearly lanose.

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

cauline;

sheaths shorter than the internodes, glabrous or puberulent;

collars glabrous or pubescent at the sides;

ligules 0.5-1 mm;

blades usually less than 6 cm long, 0.5-1 mm wide, pale green, involute, glabrous or puberulent abaxially.

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 or racemose, 5-10 cm long, 1-2 cm wide, with few spikelets;

rachis nodes glabrous or with straight hairs;

primary branches 1-2 cm, appressed, without axillary pulvini.

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.

appressed, only slightly overlapping.

unequal, 1-2-veined;

lower glumes 4-10 mm;

upper glumes 7-15 mm;

calluses about 1 mm;

lemmas 5-7 mm, purple or mottled, junction of the lemma and awns evident;

awns twisted together basally into a 4-26 mm column, free portions 12-50 mm, those of the central and lateral awns similar in length, curved to arcuate basally, straight and divergent distally, disarticulating at the base of the column at maturity;

anthers 3, about 2 mm long.

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.

6-7 mm, light chestnut brown.

= 22.

= unknown.