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.

30-200 cm, erect, occasionally geniculate below, compressed, branched;

internodes solid.

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, scabrous, or sparsely pilose below, hairs never papillose-based;

ligules 0.3-1 mm, truncate, firmly membranous, fimbriate or erose, sometimes pilose at the sides;

blades 5-45 cm long, 4-10 mm wide, glabrous abaxially, glabrous or sparsely pilose adaxially.

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.

5-60 cm, with 9-25 usually racemose (rarely subdigitate) branches;

secondary panicles not present in the lower sheaths;

branches (1.5)3-18 cm, erect to spreading, somewhat flexible.

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

2.5-4 mm, imbricate to distant, with 3-6(8) 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.

1-1.8 mm long, about 0.5 mm wide, narrowly elliptic to ovate, somewhat laterally compressed.

glumes 1.7-2.9 mm, lanceolate, acute;

upper glumes 1.7-3.8 mm, lanceolate to ovate, acute, acuminate, rarely mucronate;

lemmas (1.5)2.3-3.6 mm, ovate, chartaceous, veins sericeous, apices usually acute, rarely obtuse, unawned, mucronate, or awned, awns to 11 mm;

paleas glabrous;

anthers 2, 0.2-0.5 mm.

= 40, 60, 80.

= 40.