Flora of North America species comparison

nearly distichous, spreading to ascending, 1/2 length of culms;

sheath margins entire, backs smooth to pubescent;

ligule present, complete;

blades narrowly linear, proximally flat, 2–3.5(–4) mm wide, margins scabrid-ciliate, abaxial surface sometimes pubescent.

nearly distichous, mostly spreading, to 2/3 length of culms;

sheaths ciliate, sheath backs often pilose-hirsute;

ligule present, complete;

blades narrowly linear, 1.5–2.5 mm wide, flat or shallowly concave, margins scabrid, abaxial surface scattered-pilose, hirsute-ciliate at least proximally.

anthelae simple or compound, longer than wide;

scapes wandlike, nearly terete or slightly compressed, distally 1 mm thick, marginal ribs scabrid;

longest primary involucral bract shorter than panicle.

anthelae simple or compound, open, divaricately branched, mostly as broad as long;

scapes slender, 1 mm wide, distally slightly compressed;

proximalmost involucral bract exceeding or shorter than anthela.

pale dull brown, lance-ovoid to cylindric-ellipsoid, 10–12 mm;

fertile scales ovate, 3.5–4 mm, apex broadly acute, ciliate, surface uniformly puberulent, midrib excurrent as mucro or cusp.

pale brown or red-brown, ovoid to lanceoloid, 5–6 mm;

fertile scales broadly ovate, 1.5–2 mm, acute- to obtuse-angled, midrib short-excurrent as mucro.

stamens 3;

styles 2-fid, flat, fimbriate.

stamens 1–2;

styles 2-fid, flat, fimbriate.

dark brown, lenticular-obovoid, 1.5 mm, finely cancellate, with 20 or more longitudinal rows of horizontally rectangular pits per side.

whitened-iridescent to brown, lenticular or pyriform-obovoid, 1 mm, cancellate, each face with 5–12 vertical rows of transversely oriented rectangular pits, achene margins distally papillose.

= 20.

= 20.