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, erect to ascending or decumbent, branched distally, (5–)1–2.4(–3.2) 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–)1–3 cm;

blade 1- or 2-pinnatifid, 0.7–3.5 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.

usually sessile, rarely shortly petiolate;

blade obovate to oblanceolate (in outline), 0.8–2 cm × 2–9 mm, base cuneate, auriculate or not, margins dentate to laciniate or pinnatifid.

elongated in fruit;

rachis glabrous or pubescent, trichomes straight, cylindrical.

elongated in fruit;

rachis hirsute, trichomes mostly 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 (tardily deciduous to somewhat persistent), ovate to broadly oblong, 0.7–1 × 0.4–0.6 mm;

petals (absent or rudimentary), white, linear-oblanceolate, 0.1–0.7 × 0.05–0.15 mm, claw absent;

stamens 2, median;

filaments 0.7–1 mm;

anthers 0.15–0.2 mm.

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

divaricate to horizontal, usually slightly recurved, rarely straight, (terete), 2–3.5(–5) × 0.2–0.3 mm, puberulent adaxially or, rarely, throughout.

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 obovate or elliptic, 2.2–3.5 × 2–3 mm, apically winged, apical notch 0.2–0.3 mm deep;

valves thin, smooth, not veined, glabrous or sparsely puberulent (along margin);

style to 0.1 mm, included in apical notch.

ovate, 1–1.2 × 0.7–0.8 mm.

ovate, 1.2–1.6 × 0.7–1 mm.

= 32.