Flora of North America species comparison

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

often several from base, usually ascending or decumbent to prostrate, rarely erect, branched distally, (0.4–)0.7–1.7(–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).

not rosulate;

petiole 0.5–3 cm;

blade 2-pinnatifid (lobes lanceolate to oblong), 1.5–5.6 cm, margins (of lobes) entire.

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;

blade pinnatifid, 0.8–3 cm × 0.3–8 mm, base cuneate to attenuate, not auriculate, margins (of lobes) entire.

elongated in fruit;

rachis glabrous or pubescent, trichomes straight, cylindrical.

elongated, (dense) in fruit;

rachis puberulent, 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 (persistent), oblong, 0.7–1(–1.2) × 0.3–0.4 mm;

petals (rudimentary), white, linear, 0.2–0.5 × 0.05 mm, claw absent;

stamens 2, median;

filaments 0.5–0.8 mm;

anthers 0.1–0.15 mm.

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

suberect and subappressed at base, recurved and becoming divaricate distally, strongly curved, (often flattened and narrowly winged), (1–)1.4–2.5(–3) × 0.2–0.4 mm, puberulent 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.

ovate-orbicular to ovate, 2.5–3.3 × 2–3 mm,apically winged, apical notch 0.3–0.6 mm deep;

valves (enclosing seeds), thin, smooth, reticulate-veined, glabrous or puberulent on margin;

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

ovate, 1–1.2 × 0.7–0.8 mm.

oblong, 1.2–1.6 × 0.7–0.8 mm.

= 32.

= 32.