Flora of North America species comparison

arising at slightly different heights, not forming just 1 rosette, green, often grayish, dull, ternate or quinate, then 2–3-pinnately dissected;

petiole sheathing basally to less than 1/2 length;

blade ovate, triangular, or rhombic, 2–15(–22) × 1–10 cm, adaxial surface of rachis not channeled, not lower than the rest of the blade surface, surfaces sparsely to densely puberulent or villous-puberulent;

primary leaflets much divided, ultimate segments 100–1500, narrowly linear to linear, oblong, ovate-lanceolate, 1–9 × 0.5–2 mm, margins entire, apex acute, callus tips 0.2–0.3 mm, firm but not spinelike, terminal segment 10–20 mm;

cauline leaves (0–)1–3.

subterranean.

1–30 per plant, 1(–3) per stem, spreading to erect, not inflated, 7–25(–30) cm, exceeding leaves, 1–3 mm wide 1 cm below umbel, hirtellous.

2.5–6 cm wide in flower, 2–10(–12.5) cm wide in fruit, rays 5–25, spreading-ascending, 2–6(–8.5) cm in fruit, subequal to unequal, usually tomentose;

involucel bractlets usually 10, distinct or connate 15–80% of length, linear-lanceolate to ovate, sometimes triangular, 2–10(–18) mm, longer ones usually equaling to greatly surpassing flowers, margins usually not scarious-margined, ciliate, entire, toothed, or lobed, sometimes densely villous-puberulent, especially distally, rarely glabrous except for marginal cilia.

petals white or yellow, rarely green, pink, or purple, glabrous or very rarely tomentose;

anthers colored as petals, usually white;

ovaries sparsely to densely tomentose, sometimes glabrescent with age.

2–10(–18) mm, shorter than fruit.

dorsiventrally compressed, narrowly or broadly oblong, narrowly or broadly elliptic, or lanceolate, (7–)9–20(–28) × 2–8(–10) mm, length/width ratio 1.8–4.5 (usually more than 3 if east of Cascade Range), glabrous or sparsely to densely tomentose;

wings 0.9–3.3 mm wide, 40–170% of body width, paler than body;

abaxial ribs not raised;

apex acute, obtuse, or truncate;

oil ducts 1(–3) in intervals, 2–6 on commissure, sometimes obscure.