Flora of North America species comparison

30-90 cm, erect or ascending, some-what compressed;

lower internodes 1.5-2 mm thick.

to 62 cm, often branching;

lower internodes 6-10 mm thick.

conspicuously keeled, margins often with long, papillose-based hairs, particularly near the throat;

ligules 0.2-1 mm, truncate, erose;

blades 15-40 cm long, 3-7 mm wide, with prominent, white midveins, margins and/or adaxial surfaces often with basal papillose-based hairs.

glabrous;

ligules 1-2 mm, ciliate, with 1-2 mm hairs;

blades 10-60 cm long, 6-12 mm wide, sometimes longer than the culms, adaxial surfaces scabrous or pubescent.

with 4-10(17) branches, often with 1 branch attached as much as 3 cm below the terminal cluster;

branches (3.5)7-16 cm long, 3-5.5 mm wide, linear.

subdigitate, with 4-20 branches, 1(2) of the branches attached below the terminal cluster;

branches 4-17 cm long, 5-15 mm wide, spreading at maturity.

4-7 mm long, 2-3 mm wide, with 5-7 florets, obliquely attached to the branch axes.

5-9 mm long, 3-6 mm wide, with 2-9 florets, sometimes not disarticulating at maturity.

1.1-2.3 mm, 1-veined;

upper glumes 2-2.9 mm;

lemmas 2.4-4 mm;

paleas with narrowly winged keels.

1.2-3 mm, 2- or 3-veined;

upper glumes 2.2-6.5 mm;

lemmas 2.2-5 mm;

anthers about 1 mm.

ovoid, rugulose and obliquely striate, usually not exposed at maturity.

oblong-globose, granular, usually exposed at maturity.

= 18.

= 36.