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.

15-100 cm, round, glabrous or appressed-pubescent;

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.

sometimes flattened below, usually glabrous, sometimes sparsely pilose at the apices;

ligules 1.8-5.4 mm, truncate, erose or ciliate;

blades (1)5-30 cm long, 4-8 mm wide, glabrous, sometimes 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.

20-50 cm, with 25-60 racemose branches;

branches (1)4-8(14) cm, erect to slightly reflexed, usually straight.

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

2.5-3.7 (4.2) mm, imbricate to somewhat distant, green to tan, with 4-6 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.

triangular to lanceolate;

lower glumes 1.1-1.7 mm;

upper glumes 1.6-2 mm;

rachilla segments usually visible between the florets;

lemmas 1.2-1.7 mm, ovate to elliptic, glabrous or hairy along and between the veins, apices broadly acute or obtuse;

paleas glabrous or hairy;

anthers 3, 0.4-0.6 mm.

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

0.9-1.9 mm long, 0.6-0.8 mm wide.

= 40, 60, 80.

= 40.