OregonFlora species comparison

subterete, 10–30 cm × 0.3–0.5 mm.

usually triangular, occasionally terete, rarely compressed or quadrangular; solid or pithy.

basal and/or cauline, alternate, usually 3-ranked, bases forming cylindric sheaths enclosing stem;

margins fused;

ligules often present;

blades frequently absent from some basal leaves, rarely from cauline leaves; when present flat, folded, rolled, or terete, linear.

ovoid, 3–8 × 2–3 mm;

proximal scale clasping; entire, subproximal scale with flower; floral scales 8–30, 4–5 per mm of rachilla, 2–3 × 1.5 mm;

apex entire; acute, often keeled in distal part of spike.

with a shortened axis; floral scales 1–many, crowded, spirally arranged, sometimes 2-ranked, usually each subtending a single flower or perigynium, sometimes proximal and/or distal scales empty; perigynia if present closed or open down one side, subtending and enclosing a very short rachilla-bearing 1-pistillate flower (Carex), sometimes also (0)3 staminate flowers and empty scales (Kobresia);

spikes aggregated into secondary inflorescences that are panicles, often modified and sometimes consisting of a single spike; secondary inflorescences usually subtended by a foliaceous or scale-like or bristle-like bract.

perianth bristles 3–6, often unequal; from rudimentary to 50% of achene length;

anthers 0.9–1.4 mm;

stigmas 3.

bisexual (unisexual in Carex and Kobresia);

perianth absent or consisting of (1)3–6(30) bristles and/or scales;

stamens usually (1)3, rarely more;

ovary with 1–3(4) carpels, fused; locule 1;

style undivided or branched;

stigmas 2–3(4).

achenes, usually trigonous or biconvex.

slightly to greatly compressed-trigonous, rarely thickly lenticular, 0.9–1.2 × 0.65–0.8 mm.

persistent, not splitting;

apex obtuse, rarely hardened, lacking a tooth.

flat to shallowly pyramidal; lower than wide, 0.1–0.3 × 0.4–0.65 mm.