Forest shrub or tree, to 30 ft. high
Shrub or generally tree, 4–14(–20) m. tall; bark greyish-brownish.
Leaves ± deciduous, aggregated towards the ends of the branches; blade ovate, apex acuminate, base broadly cuneate to cordate, membranous to chartaceous, glabrous, 10–28 cm. long, (5.5–)8–20 cm. broad, 5-nerved from the base, upper lateral nerves 2–4 pairs, veins ± transverse, prominent beneath with ± pronounced reticulation of the veinlets; petiole 4–12(–19) cm. long; stipules subulate-aristate, up to 2.5 cm. long, caducous.
Flowers 2–5 in a fascicle from defoliate axils, or from old branches, even from the trunk, appearing with the young leaves, up to 10 cm. in diameter; pedicels sparingly glandular, 1.5–2.5 cm. long at anthesis, up to 4 cm. in fruit.
Sepals oblong-elliptic, glandular dorsally, subpersistent, 1.2–2 cm. long, 0.7–1.3 cm. broad.
Petals ± 10, about twice the size of the sepals, spathulate-oblong, strongly veined towards the base, (1.6–)2.5–4.5 cm. long, (0.6–)1–2.3 cm. broad.
Filaments up to 2.5 cm. long; anthers 3–4 mm. long.
Ovary tuberculate; style slender, ± 1 cm. long, with 5–6 short stigmatic branches.
Capsule elliptic to subglobular, 7–10(–15) cm. long, 4–6(–12) cm. across including the spines (these (1.5–)2–5 cm. long), splitting into 5–6 valves, which recurve when ripe; pericarp ± 5 mm. thick.
Seeds numerous, globose, puberulous, 5–7 mm. long, 3–4 mm. broad.
Small or medium sized tree up to c. 14 m. tall, branches glabrous or puberulous.
Seeds numerous, 6–7 mm. in diam., globose, puberulous.
Ovary tuberculate; placentas 5–6; style slender, c. 1 cm. long, stigma-lobes 5–6, linear, obtuse or capitate.
Stamens very numerous with slender filaments up to 2 cm. long; anthers linear, 4 mm. long, dehiscing by apical slits.
Fruit a densely echinate capsule c. 8 cm. in diam. (including spines), with slender spines 1.5–2 cm. long, splitting into 5–6 recurved valves when ripe; style persistent.
Flowers up to 10 cm. in diam., scented, borne on the previous year’s branches or on older wood, appearing with the young leaves, in fascicles of 2–5; pedicels up to c. 2–5 cm. long, sparingly glandular.
Leaves collected towards the ends of the branches; lamina up to 25 x 18 cm., membranous, ovate, apex acuminate, base rounded or slightly cordate, 5-nerved from the base; petiole up to 15 cm. long; stipules up to 2.5 cm. long, subulate-aristate, caducous.
Petals white, c. 10, about twice the size of the sepals, spathulate-oblong, tapering to a short basal claw, strongly veined towards the base.