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.

ultimate divisions of basal leaves dimorphic, laterals 5–30 mm, terminal 30–80 mm, both 1–4 mm wide.

2–20 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.

involucral bracts and involucel bractlets deciduous, narrowly lanceolate, entirely scarious;

umbellets 25–30-flowered.

2–5 mm.

petals 1-veined;

styles 2 mm, spreading and usually recurved.

oblong;

mericarps 4–6 mm;

ribs threadlike;

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

= 38.