Flora of North America species comparison

20-60(100) cm, not forming corms.

55-125 cm, forming corms, corms attached to the rhizomes;

internodes scabridulous basally.

glabrous or shortly and sparsely pubescent;

ligules 1-4 mm;

blades 7-15 cm long, 1-4 mm wide, usually involute.

usually scabridulous, sometimes glabrous or pilose;

ligules 0.4-5 mm, to 1.5 mm on the lower leaves, to 5 mm on the upper leaves;

blades 2-10 mm wide, abaxial surfaces smooth or scabridulous, adaxial surfaces scabridulous, glabrous or with hairs.

4-8(25) cm, narrowly cylindrical, lax, pale;

branches 1.5-4 cm, appressed to ascending, with 3-12(15) spikelets;

pedicels sharply bent below the spikelets;

disarticulation below the glumes.

8-25 cm, lax;

branches 1.7-9 cm, usually appressed to ascending, occasionally divergent, with 1-5 spikelets;

pedicels not sharply bent;

disarticulation above the glumes.

6-8 mm, with 1 bisexual floret, sometimes purple-tinged.

10-28 mm, with 2-5 bisexual florets;

rachilla internodes 1.8-2 mm.

4-6 mm long, 1.5-2.5 mm wide, ovate, 1-5-veined, acute;

upper glumes 6-8 mm long, about 1.5 mm wide, lanceolate, acute to acuminate;

lemmas 4-6.5 mm, lanceolate, 7-9-veined, papillose, margins and marginal veins pubescent, hairs 3.5-5 mm, not twisted;

rudiments 1-1.7 mm, ovoid, not resembling the bisexual florets.

4-8 mm long, 1.3-2.2 mm wide, 1-3-veined;

upper glumes 5.5-11.5 mm long, 2-3 mm wide, 3-5-veined;

lemmas 5.5-18 mm, usually strigose over the veins, hairs longest towards the base, 7-9-veined, veins prominent, apices strongly tapering and acuminate, unawned;

paleas 1/2 - 3/4 the length of the lemmas;

anthers 1.5-2.5 mm;

rudiments 4-9 mm, tapering, resembling the bisexual florets.

4-5 mm.

=18, 36.

= 18.