Flora of North America species comparison

simple from base, erect, branched distally, (3.5–)4.5–16(–18) dm.

simple from base, erect ascending, branched (several) distally, (0.5–)1–3.5(–5.5) dm.

(soon deciduous), not rosulate;

petiole (1–)2–5.5(–7.5) cm;

blade pinnatifid, (2–)3–6.8(–9) cm × 10–30 mm, margins (of lobes) dentate to serrate.

rosulate;

petiole 1–3.2(–5.3) cm;

blade (1- or) 2- or 3-pinnatisect (lobes oblong), (1.5–)3–5(–7.2) cm, margins (of lobes) usually entire, rarely dentate.

shortly petiolate or sessile;

blade narrowly lanceolate or oblanceolate to linear, 3–7 cm × (2.5–)4–10mm (smaller distally), base attenuate to cuneate, not auriculate, margins usually entire, rarely dentate.

sessile;

blade linear, (0.4–)1–2(–3) cm × 0.5–2.5(–3.5) mm, base cuneate, not auriculate, margins entire.

elongated in fruit;

rachis puberulent, trichomes straight or curved.

considerably elongated in fruit;

rachis puberulent, trichomes straight, cylindrical.

sepals suborbicular to oblong, 0.8–1.5 × 0.7–1.2 mm;

petals white, suborbicular, 2.2–3.5(4) × 1.5–2.5 mm, claw 0.7–1.5 mm;

stamens 6;

filaments 1.5–2.5 mm, (glabrous);

anthers 0.3–0.4 mm.

sepals oblong, 0.5–0.9(–1) × 0.2–0.4 mm;

petals (absent or rudimentary), white, linear, 0.2–0.5 × 0.1 mm, claw absent;

stamens 2, median;

filaments 0.7–0.8 mm;

anthers 0.1–0.2 mm.

divaricate-ascending to horizontal, usually slightly recurved or somewhat sigmoid, rarely straight, (not winged), (3–)3.5–7.5(–8) × 0.2–0.3 mm, puberulent adaxially.

divaricate to horizontal, straight, (terete), (1.5–)2–4(–5) × 0.1–0.15 mm, puberulent.

broadly ovate, 2–3.5(–4) × 1.8–2.6(–3) mm, apically winged, apical notch 0.1–0.2mm deep;

valves thin, smooth, not veined, glabrous;

style (0.2–)0.3–0.6(–0.7) mm, exserted beyond apical notch.

elliptic, (1.5–)1.8–2.5(–3) × 1.5–2(–2.3) mm, apically winged, apical notch 0.1–0.2 mm deep;

valves thin, smooth, not veined, glabrous;

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

(dark brown), ovate, 1.4–1.8 × 0.8–1.1 mm.

oblong to ovate-oblong, 1–1.5 × 0.6–0.8 mm.

= 16, 32.