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Description:
Andromonoecious shrubs or treelets to 3(5) m tall. Leaves 2–3-imparipinnate, (5–)10–50(–70) cm long; primary leaf divisions (7–)11–15, each further divided once or twice (rarely only pinnatifid or deeply lacerate to serrate), the ultimate divisions light to yellowish green above and beneath, papyraceous, usually lanceolate, 3–6 times as long as broad, (1–)2–10(–18) × (0.2–)0.3–2(–5) cm (rarely ovate-lanceolate and somewhat wider), the apex long-acuminate, the margin laciniate to spinulose-serrate, usually irregularly so, slightly thickened and minutely revolute, with at least some teeth 5–10 mm long, the base narrowly cuneate to attenuate, often oblique; petiolules of the primary divisions ca. 1–3(–5) cm long; rachis articulated at petiolule bases; petiole (2–)5–15 cm long, clasping at the base, inconspicuously alate for 0.8–2.5 cm with narrow, membranous wings. Inflorescence terminal, erect, glabrous throughout, the bractlets early caducous, the primary axis 8–30(–60) cm long, the secondary axes 5–15, scattered or more often subverticillate, 7–25(–30) cm long, tertiary axes 5–15 per secondary axis, mostly grouped in 2–4 verticils, each 1–6 cm long at maturity, bearing a terminal umbellule of hermaphroditic, protandrous flowers and 2–6 paired, lateral umbellules of functionally staminate flowers borne on short peduncles and subtended by a small, subulate, irregularly persistent bractlet 0.5–1.5 mm long, the peduncles of the hermaphroditic umbellules each bearing ca. 5–30(–40) flowers (often fewer in staminate umbellules), the pedicels 1.5–4(–5)mm long (shorter in staminate flowers). Calyx cupuliform, 0.3–0.5 mm high, the rim undulate and 5-toothed, hyaline. Corolla oblong-elliptic in bud, greenish or white, the petals 5, spreading and soon falling at anthesis, obovate-oblong, (1.5–)2–3 mm long (smaller in staminate flowers). Stamens 5, the filaments slender, 1–1.2 mm long, the anthers cream white, 1.5–2 mm long. Ovary 2–3 (rarely 4)-carpellate, urniform, 1–1.5 mm high at anthesis; styles as many as carpels, free nearly to the base, 0.8–1.2 mm long and erect at anthesis, spreading as they become divergent, then recurving and expanding in fruit to 1.5 mm long. Mature fruit laterally compressed or trigonous (rarely quadrangular), orbicular to ovate-orbicular, 4–5 mm high, 4.5–6 mm wide, the base rounded (sometimes shallowly subcordate).
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