Flora of North America species comparison

several from base, usually erect to ascending, rarely decumbent, branched, 0.4–1.5(–2) dm.

simple to numerous from base, erect to ascending or decumbent, sometimes branched distally, (0.4–)1–3.5(–4.2) dm.

(soon withered);

not rosulate;

petiole 0.5–1.5(–2) cm;

blade margins entire or pinnatifid (lobes 2–5 pairs, linear to filiform), 1.5–5 cm × 0.5–2 mm.

(soon withered);

not rosulate;

petiole (0.4–)1–4.2(–5) cm;

blade pinnatisect (lobes usually linear to filiform, rarely oblong to lanceolate), (0.8–)1.5–7.3(–8) cm, margins (of lobes) usually entire, rarely dentate.

petiolate;

blade linear, 0.1–0.3 cm × 0.5–2 mm, base attenuate, not auriculate, margins entire.

petiolate or subsessile;

similar to basal, blade smaller, sometimes undivided and linear, base attenuate, not auriculate.

considerably elongated, (lax) in fruit;

rachis glabrous or puberulent, trichomes straight, cylindrical.

much-elongated, (lax) in fruit;

rachis puberulent to hirsutulous, trichomes straight, cylindrical.

sepals oblong, 0.6–0.8 × 0.4–0.5 mm;

petals absent;

stamens 4, median;

filaments 0.6–0.7;

anthers ca. 0.1 mm.

sepals oblong-ovate, (0.7–)0.9–1.3(–1.5) × 0.5–0.8 mm;

petals (rarely rudimentary or absent), white, oblanceolate, (0.8–)1.2–2(–2.8) × 0.2–1(–1.6) mm, claw absent, (glabrous);

stamens usually 4, median, rarely 6;

filaments (0.5–)0.7–1(–1.3);

anthers 0.1–0.2 mm.

divaricate to horizontal or descending, usually recurved, rarely straight, (terete or slightly flattened), 2–4(–6) × 0.2–0.3 mm, glabrous or puberulent adaxially.

usually divaricate, rarely ascending or suberect, usually slightly or weakly recurved, rarely straight, (strongly flattened), 2.5–5(–6.5) × (0.4–)0.6–0.9(–1.1) mm, puberulent adaxially and sometimes on proximal 1/3 abaxially.

ovate, 2.4–3.6 × 1.8–2.5 mm, apically winged, apical notch (V-shaped), 0.3–0.8 mm deep;

valves thin, smooth, strongly reticulate-veined, glabrous;

style obsolete or to 0.1 mm, included in apical notch.

orbicular to broadly ovate, (2.5–)3–5.5(–6.5) × (2–)2.6–5(–5.4) mm, apically winged, apical notch 0.3–0.7(–1) mm deep;

valves thin, smooth, slightly veined or not, usually glabrous, rarely minutely and sparsely puberulent (along margin);

style usually obsolete, rarely to 0.1 mm, included in apical notch.

oblong, 1.4–1.8 × 0.8–0.9 mm.

ovate-oblong, 1.6–2.6 × 0.9–1.2 mm.