Flora of North America species comparison

(1–)3–6(–8), robust.

petiole 5–25(–30) cm;

blade (1–)2-pinnate, oblong to ovate, (8–)10–22 cm;

leaflets broadly lanceolate to ovate, 2–10(–12) cm, incised or lobed at base, margins serrate, apex acute.

rather constricted, of (3–)5–15 umbellets, (1–)3–10(–12) of them staminate, remainder including (1–)2–6 bisexual flowers;

involucral bracts 0 or 1–2, linear, minute;

rays spreading-ascending to nearly erect, (2.8–)3–8(–9.5) cm;

involucel bractlets 0 or 1(–2), linear-lanceolate, minute.

spreading to ascending, of bisexual flowers (2–)2.5–7(–10) mm, of staminate 2–4.5(–6) mm.

petals yellow to greenish yellow;

stylopodium low-conic;

disc conspicuous;

styles including stylopodium (0.7–)0.9–1.4(–1.8) mm.

linear-fusiform;

mericarps (12–)13–22 mm, caudate appendage absent or rarely to 1.8 mm, apex slightly constricted below stylopodium, ribs glabrous.