Flora of North America species comparison

few to several from base, erect to ascending or decumbent, branched distally, 1–4.5(–7) dm.

often simple from base, erect, branched (several) distally, (0.8)1.2–4.9(–6) 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).

(often withered at anthesis); rosulate;

petiole 1–3(–4.5) cm;

blade pinnatifid (lobes oblong to ovate or lanceolate), (1.4–)2.2–7(–10) cm, margins (of lobes) dentate-sinuate.

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.

shortly petiolate; 1.5–6 cm × 6–25 mm, base not auriculate, margins (of lobes) entire or dentate.

elongated in fruit;

rachis glabrous or pubescent, trichomes straight, cylindrical.

considerably elongated in fruit;

rachis pilose, trichomes straight, cylindrical (to 1 mm) with much smaller, clavate ones, sometimes one type present.

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 suborbicular to broadly ovate, 1–1.6 × 0.7–1 mm;

petals white, broadly obovate to suborbicular, 3–4 × 1.2–2.2 mm, claw 0.7–1.3 mm;

stamens 6;

filaments (median pairs) 1–1.6 mm, (glabrous);

anthers 0.4–0.5 mm.

divaricate to horizontal, straight slightly recurved, (terete), 1.4–2.5(–4) × 0.15–2 mm, glabrous or sparsely pubescent adaxially.

divaricate-ascending to horizontal, straight or slightly recurved, (terete), 4–8(–10) × 0.2–0.3 mm, puberulent or pilose adaxially.

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.

broadly ovate to orbicular, 2–2.9 × 2–2.8 mm, apically winged, apical notch 0.1–0.2 mm deep;

valves thin, smooth, not veined, glabrous;

style 0.3–0.8 mm, exserted beyond apical notch.

ovate, 1–1.2 × 0.7–0.8 mm.

ovate-oblong, 1.3–1.6 × 0.8–1.1 mm.

= 32.