Flora of North America species comparison

(10) 30-110 cm, round or basally compressed, tillering from the basal nodes, not branching from the aerial nodes, mostly glabrous, sometimes pilose basally;

internodes solid.

(7)45-110 cm, often geniculate below, usually ascending to erect above, rarely branching at the base, often branching distally;

internodes hollow.

sometimes with a pilose collar;

ligules 1-2 mm, truncate, erose;

blades (2)8-35 cm long, 2-8 mm wide, glabrous, strigose, or pilose.

glabrous, margins occasionally sparsely ciliate on the basal 1/2;

ligules 2.2-3.8 mm, membranous, truncate, somewhat erose;

blades 4-20 cm long, 4-8 mm wide, both surfaces smooth or scabridulous.

8-20 cm, with 2-15 subdigitate or racemose branches;

secondary panicles often hidden in the lowest leaf sheaths;

branches 2-19 cm, ascending to spreading at maturity.

20-35 cm, with 20-30(90) racemose branches;

branches 2.5-7 cm, ascending, mostly stiff.

4-12 mm, light brown to dark olive green, with 4-13 florets, often widely diverging at anthesis.

4-5 mm, usually somewhat imbricate, with 4-6(7) florets.

narrowly triangular to ovate, acute;

lower glumes 2.3-4.8 mm;

upper glumes 3.3-6 mm;

lemmas 3.5-5 mm, membranous, ovate to obovate, lateral veins glabrous or sericeous, hairs often restricted to the basal portion, sometimes also sericeous on the midvein and between the veins, apices obtuse to truncate, usually emarginate, unawned, sometimes mucronate;

paleas ciliate on the margins;

anthers 3, 0.3-1.6 mm.

1.5-2.3 mm long, 0.9-1 mm wide, strongly dorsally compressed.

1.1-1.4 mm long, 0.7 mm wide, elliptic, depressed obovate in cross section.

glumes 0.9-1.9 mm, usually lanceolate, sometimes falcate, acute;

upper glumes 1.8-2.3 mm, ovate, acute to obtuse;

lemmas 2.4-3 mm, narrowly elliptic to ovate, membranous, midveins and lateral veins sericeous basally, lateral veins prominent, excurrent, apices acute to broadly acute, unawned, sometimes mucronate;

paleas glabrous;

anthers 3, 0.6-0.8 mm.

= 40, 60, 80.

= 20.