Flora of North America species comparison

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

simple from base, erect, (paniculately) branched beyond base or distally, 2–6 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).

(soon withered, often before anthesis);

not rosulate;

blade dentate to pinnatifid.

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 to subsessile;

blade narrowly oblanceolate to linear, 1–3.3 cm × 1–4 mm, base attenuate, not auriculate, margins entire.

elongated in fruit;

rachis glabrous or pubescent, trichomes straight, cylindrical.

(often paniculate), considerably elongated in fruit;

rachis glabrous or 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 oblong, 0.7–0.8 × 0.3–0.4 mm;

petals (rudimentary), white, linear, 0.4–0.6 × 0.05–0.1 mm, claw absent;

stamens 4, median and lateral;

filaments 0.6–0.8 mm;

anthers ca. 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-ascending to horizontal, straight, (terete), 2–3.5 × 0.1–0.15 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.

orbicular to broadly elliptic, 1.8–2 × 1.7–1.8 mm, apically not winged, apical notch 0.05–0.1 mm deep;

valves thin, smooth, not veined, sparsely pilose;

style ca. 0.1 mm, equaling apical notch.

ovate, 1–1.2 × 0.7–0.8 mm.

oblong, 1–1.2 × 0.7–0.8 mm.

= 32.