Flora of North America species comparison

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

several from base (caudex), erect or ascending to decumbent, branched distally, 0.5–2.3 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 1–2.5 cm;

blade oblanceolate (rarely with 1 or 2 lateral lobes), 1–3.5 cm × 3–7 mm, margins serrate-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 or sessile;

blade narrowly oblanceolate to linear, 0.7–3.5 cm × 1–4 mm, base attenuate, not auriculate, margins entire or distally serrulate.

elongated in fruit;

rachis glabrous or pubescent, trichomes straight, cylindrical.

elongated in fruit;

rachis puberulent, trichomes curved, 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, 0.6–0.9 × 0.3–0.4 mm;

petals (absent or rudimentary), white, oblanceolate, 0.3–0.6 × 0.1–0.2 mm, claw absent;

stamens 2, median;

filaments 0.6–0.7 mm;

anthers 0.1–0.2 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, slightly recurved, (terete), 2–4(–5.5) × 0.15–0.2 mm, densely puberulent 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.

elliptic, 2.4–2.8 × 1.6–2 mm, apically winged, apical notch 0.2–0.3 mm deep;

valves thin, smooth, not veined, puberulent (at least along margin);

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

ovate, 1–1.2 × 0.7–0.8 mm.

oblong, 1.3–1.4 × 0.7–0.8 mm.

= 32.