Flora of North America species comparison

45-100 cm, forming corms, corms connected to the rhizomes by a rootlike, 10-30 mm structure, which usually remains attached to the corm;

internodes smooth.

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

internodes scabridulous basally.

usually glabrous, often pilose at the throat and collar;

ligules 0.1-2 mm;

blades 2-5 mm wide, abaxial surfaces scabridulous over the veins, adaxial surfaces usually glabrous.

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.

5-26 cm;

branches 2-5 cm, usually appressed, sometimes divergent and flexuous, with 2-3 spikelets;

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.

7-19 mm, with 3-7 bisexual florets, base of the distal florets concealed at anthesis;

rachilla internodes 1-2 mm, not swollen when fresh, not wrinkled when dry.

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

rachilla internodes 1.8-2 mm.

usually less than 1/2 the length of the spikelets;

lower glumes 3.5-6.4 mm long, 1.5-3 mm wide, 1-3-veined;

upper glumes 5-7 mm long, 2.3-3.5 mm wide, 5-7-veined;

lemmas 6-9 mm, glabrous, scabridulous, 5-11-veined, veins inconspicuous, apices rounded to acute, unawned;

paleas about 73 the length of the lemmas;

anthers 1.5-3 mm;

rudiments 1.5-3.5 mm, acute, distinct from the bisexual florets, sometimes surrounded by a small sterile floret similar in shape to 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.

= 18.