Flora of North America species comparison

few to several from base, erect to ascending or decumbent, branched distally, 1–4.5(–7) 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 0.5–4(–6) cm;

blade 1- or 2-pinnatisect, 1–6(–8) cm, margins (of lobes) entire or dentate (sometimes deeply lobed).

(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.

shortly petiolate to subsessile;

blade similar to basal, smaller and less divided distally, lobes lanceolate to oblong or elliptic, 1.5–3.5(–4.5) cm ×5–12 mm, base not auriculate, margins (of lobes) entire, serrate, or incised.

petiolate or subsessile;

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

elongated in fruit;

rachis glabrous or pubescent, trichomes straight, cylindrical.

much-elongated, (lax) in fruit;

rachis puberulent to hirsutulous, trichomes straight, cylindrical.

sepals (tardily deciduous), ovate, 0.5–0.7(–0.9) mm;

petals white, elliptic to linear, 0.4–0.5 × ca. 0.1 mm, claw absent;

stamens 2, median;

filaments 0.3–0.6 mm;

anthers 0.1–0.2 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, straight slightly recurved, (terete), 1.4–2.5(–4) × 0.15–2 mm, glabrous or sparsely pubescent 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.

schizocarpic, didymous, 1.3–1.7 × 2–2.5 mm, apically not winged, apical notch 0.2–0.4 mm deep;

valves thick, rugose, strongly veined, glabrous;

style absent or obsolete, 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.

ovate, 1–1.2 × 0.7–0.8 mm.

ovate-oblong, 1.6–2.6 × 0.9–1.2 mm.

= 32.