Flora of North America species comparison

40-120 cm, not forming corms;

internodes smooth.

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

internodes scabridulous basally.

glabrous, scabrous, sometimes sparsely pilose;

ligules 2.5-5 mm;

blades 5.5-15 cm long, 2-6 mm wide, often sparsely pilose on both surfaces.

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.

10-26 cm;

branches 4-6 cm, appressed or strongly ascending, with 1-4 spikelets per branch;

pedicels not sharply bent;

disarticulation above 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.

11-21 mm, with (2)3-5 bisexual florets;

rachilla internodes 3.4-3.8 mm.

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

rachilla internodes 1.8-2 mm.

9-11 mm long, 1.5-2.5 mm wide, 3-5-veined;

upper glumes 11-12 mm long, 2-3 mm wide, 5-7-veined;

lemmas 8-13 mm, with 0.3-0.6 mm hairs on the marginal veins, glabrous or with hairs to 0.1 mm elsewhere, 5-7-veined, veins prominent, apices bifid to emarginate, awned from the sinuses, awns 5-12 mm;

paleas about 3/4 the length of the lemmas;

anthers 2, 2-3 mm;

rudiments 2.5-6 mm, tapering, 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.

5-6 mm.

4-5 mm.

=18.

= 18.