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 procumbent to decumbent, rarely ascending, branched distally, (0.3–)0.6–2.5(–3.5) 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).

rosulate;

petiole (1–)2–5(–5.8) cm;

blade 1- or 2-pinnatisect, (3–)4–10(–15) cm, margins (of lobes) entire or 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.

shortly petiolate;

blade pinnatisect, base cuneate, not auriculate, margins (of lobes) entire or dentate, (similar to basal, smaller and less divided distally).

elongated in fruit;

rachis glabrous or pubescent, trichomes straight, cylindrical.

(leaf-opposed), ± slightly elongated in fruit;

rachis glabrous.

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, 1–1.5 × 0.5–0.6 mm;

petals white, obovate to obovate-oblong, 1–2 × 0.4–0.6 mm, claw absent;

stamens 6;

filaments (median pairs) 0.7–1 mm, (glabrous);

anthers 0.15–0.25 mm.

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

ascending, straight, (stout, terete), (0.7–)1–2(–2.4) × 0.4–0.5 mm, glabrous.

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.

(indehiscent), reniform to ovate-cordate, 2.3–3.4 × 3–4.4 mm, apically not winged, apical notch absent;

valves thick, rugose-verrucose, with distinct ridges, prominently veined, glabrous;

style 0.2–0.7 mm.

ovate, 1–1.2 × 0.7–0.8 mm.

ovate-oblong, (curved, not winged), 1.2–1.6 × 0.7–1 mm.

= 32.

= 32.