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Description:
Andromonoecious trees, occasionally shrubs, 1–15 m tall, monocaulous to sparsely or well branched. Leaves palmately compound, 36.5–105 cm long (incl. petiole); leaflets 7–15, medium green, slightly lighter beneath, dull to shiny, papyraceous to subcoriaceous, linear to narrowly elliptic, occasionally narrowly obovate or ovate (rarely somewhat wider), 9–41 × 1.8–8.2 cm (leaflets 3–5 in juvenile foliage, linear, 7–18 × 0.4–1 cm), glabrous, primary vein raised above, sometimes weakly so, raised beneath, secondary veins raised above, sometimes weakly so, weakly raised or obscure beneath, ca. 27–68 per side, those above terminating in a distinct collecting vein parallel to and ca. 1 mm in from the margin, tertiary veins evident, the base decurrent, the margins entire, undulate, minutely revolute, the acute to acuminate, rarely rounded to retuse; petiolule 0.5–6.5 cm long; petiole 16.5–63 cm long (4.5–9 cm in juvenile foliage), 4–10 mm diam., the base clasping, rarely sparsely pustular lenticellate, the ligulate stipule forming a low collar ca. 5–12 mm high. Inflorescence terminal, paniculate-umbellate, hemispherical to spherical, with 3 orders of branching, glabrous, axes sometimes glaucous, cataphylls caducous, resembling leaf bases, ca. 10 mm wide, 8–10 mm tall, leaving a scar, the primary axis erect, 2–12.5 cm long, the secondary axes ca. 7–11, 1–3 borne laterally along the primary axis, the others forming a terminal, umbellate cluster, each ca. 8–29 cm long, tertiary axes ca. 8–18 per secondary axis, (0–)2–8 arranged singly and/or in pairs or pseudo-whorls and the others in a terminal, umbellate cluster, each ca. 4–10 cm long, bearing a terminal umbellule of ca. 9–24 protandrous, hermaphroditic flowers and 1–5 lateral umbellules of ca. 4–10 staminate flowers, pedicels of the hermaphroditic flowers 4–7 mm long at anthesis, 0.4–0.8 mm in diam., expanding to 9–16 mm in fruit, those of the staminate flowers ca. 0.3–0.6 mm long, 0.2–0.6 mm in diam. Calyx a low rim or collar, ca. 0.5–1 mm high at anthesis (smaller in staminate flowers), 1.5–2.5 mm diam., undulate, sometimes appearing to form broadly triangular lobes. Corolla globose to subglobose in bud, the petals 5, narrowly triangular to slightly ovate, ca. 4–4.5 mm long in hermaphroditic flowers, smaller in staminate flowers. Stamens 5 (rarely 6 or 7), the filaments ca. 1.5–2 mm long in hermaphrodite flowers, the anthers ca. 1.5–2 mm long, cream white, with 4 thecae. Ovary 5-carpellate, obconical to obovoid, 3–4.5 mm tall (vestigial in staminate flowers), disc flat to slightly at anthesis, becoming conical in fruit, 2–3 mm diam. in hermaphroditic flowers, smaller in staminate flowers, styles 5, ca. 1.5 mm long in hermaphroditic flowers (vestigial and undivided in staminate flowers), united for ca. 1/2 of their length, basal portion forming a conical column, free arms ca. 0.5–0.8 mm long, spreading at anthesis, spreading to reflexed in fruit. Mature fruit terete, ellipsoid to ovoid, sometimes widely so, 5–9 mm high, 3–7 mm wide, strongly ribbed when dry, the persistent calyx forming a low rim, the base rounded.
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