Flora of North America species comparison

basal 2–4 pinnate;

petiole 2–15 cm;

blade deltate, ovate, or ovate-lanceolate, 10–20 cm, most primary leaflets dissected, ultimate divisions monomorphic or dimorphic (terminal more elongate than laterals), oblong to filiform, 5–60 mm (terminal sometimes to 80 mm), margins usually toothed or lobed;

cauline leaves usually 1-ternate or 1-ternate-pinnate.

basal 1-ternate or 1-pinnate, primary leaflets 5 or 7, sometimes simple;

petiole 3–10 cm;

blade ± ovate, 10–20 cm, primary leaflets undivided, basal sometimes deeply lobed, ultimate divisions monomorphic, ± lanceolate, 30–150 mm, margins entire;

cauline leaves 1-ternate.

2–20 cm.

3–20 cm.

involucral bracts 8–12, linear to narrowly lanceolate;

rays 9–23, 1–2 cm, subequal, ascending or spreading-ascending;

involucel bractlets 4–10, obovate or lanceolate to linear-lanceolate, 3–9 mm, widely scarious-margined or entirely scarious, apex acuminate;

umbellets convex, 18–30-flowered.

concave, flat, or convex distally;

involucral bracts 0–2, bristle-shaped;

rays (5–)6–14(–20), 1–4.5 cm, in fruit ± equal and ascending, or unequal and spreading-ascending;

involucel bractlets 3–8, linear-lanceolate, 1–4 mm, scarious-margined;

umbellets convex, 13–27-flowered.

2–5 mm.

3–4 mm.

petals 1-veined;

styles 2 mm, spreading and usually recurved.

petals 1-veined;

styles 1–1.5 mm, spreading and usually recurved.

oblong;

mericarps 4–6 mm;

ribs threadlike;

oil ducts 2–3 in intervals, 4 on commissure.

oblong to ovate or ± globose;

mericarps 1.8–5 mm;

ribs threadlike;

oil ducts 3–4 in intervals, 6 on commissure.