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Description:
Hermaphroditic shrubs or trees 2–12 m tall, monocaulous or sparsely branched. Leaves palmately compound, 40–100 cm long (incl. petiole); leaflets 7–12, light green, dull to shiny, papyraceous to subcoriaceous, elliptic to obovate, 11.5–52 × 5.5–14.5 cm, glabrous, primary vein raised on both surfaces, pale green with dark green lines, secondary veins raised on both surfaces, ca. 15–40 per side, tertiary veins visible, the base cuneate to decurrent, the margin entire, slightly revolute, the apex rounded to retuse, rarely acute; petiolule (0.5–)2–7 cm long; petiole 21–57 cm long, 5–16 mm diam., almost completely dark green proximally, light green with dark green lines distally, the base clasping, densely pustular lenticellate, the ligulate stipule forming a collar ca. 8–10 mm high. Inflorescence terminal, paniculate-umbellate, pendant-ellipsoid, very long, with 4 orders of branching, glabrous, often glaucous, cataphylls not seen, the primary axis erect, ca. 15 cm long, the secondary axes ca. 4–5, arching downward in proximal 1/5, the remainder pendant, 1 borne laterally along the primary axis, the others forming a terminal, umbellate cluster, each ca. 70–125 cm long, tertiary axes ca. 8–12 per secondary axis, 3–6 arranged singly and/or in pairs or pseudo-whorls and the others in a terminal, umbellate cluster, each ca. 8–55 cm long, fourth-order axes 6–13 per tertiary axis, 4–7 arranged in pairs or pseudo-whorls and the others in a terminal, umbellate cluster, bearing a terminal umbellule of ca. (5–)7–11 protandrous, hermaphroditic flowers and 4–6 lateral, mostly pseudo-whorled umbellules of ca. 6–8 later-developing hermaphroditic or staminate flowers, their peduncles occasionally bearing 1–2 lateral, fifth-order umbellules of even later developing flowers, pedicels of hermaphroditic flowers 5–7 mm long at anthesis, expanding up to 10 mm in fruit, those of the staminate flowers ca. 3 mm long at anthesis. Calyx a low rim or collar, ca. 0.1–0.2 mm high at anthesis (smaller in staminate flowers), 2–5 diam. Corolla hemispherical to ellipsoid, the petals 5, triangular, ca. 2–3 mm long in both hermaphroditic and staminate flowers. Stamens 5, the filaments ca. 1.5 mm long, the anthers ca. 1.5–3 mm long, with 4 thecae. Ovary 5(–7–10)-carpellate, hemispherical with a truncate base (vestigial in staminate flowers), disc conical, ca. 1.5 mm diam. in hermaphroditic flowers, smaller and flattened in staminate flowers, styles untied to form a column ca. 1.2 mm long. Mature fruit terete, widely depressed ovoid to occasionally obloid, 4–5 mm high, 5–6 mm wide, strongly ribbed when dry, the base truncate to rounded slightly concave.
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