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DescriptionSmall to large tree. Younger branches armed with robust spines up to 2 cm long. Leaves simple, opposite, more or less broadly elliptic, up to 22 cm long, hairless when mature, translucent gland-dots present, aromatic when crushed, margin entire and wavy. Flowers in dense axillary heads, large and showy, pale to deep pink with a darker purple marrom glandular spots; petals long and narrow, alternating with petal-like staminodes. Fruit a 5-lobed capsule up to 3.5 cm in diameter, covered in tubercles, yellow-green when young to brown and woody when ripe, dehiscing from the base, valves remaining connected to the stalk at the apex.