Botany
Evergreen, small to fairly large trees up to 40 m tall; bole straight, up to 70 cm in diameter, often with small buttresses or stilt roots; bark surface smooth to cracking or scaly, sometimes lenticellate, greyish-white to brown or orange-brown or red, inner bark fibrous, mottled, pinkish-brown, dull yellow or with brown and white patches. Leaves alternate, simple, entire, exstipulate. Flowers axillary, solitary, cymose or fascicled, often fragrant, bisexual; sepals 3, valvate, connate; petals 6, in 2 rows, valvate, narrow, subequal or the outer ones longer, white to greenish, yellow or reddish; stamens few to many, with an enlarged, obtuse to pointed connective; carpels 2-many, free, each with 1-8 ovules in 1 or 2 rows, style usually long, stigma club-shaped to linear. Fruit apocarpous, with 1-30(-40) monocarps, each monocarp sessile or stipitate, not dehiscing or dehiscent along the dorsal suture, globose to narrowly oblong, 1-16-seeded, sometimes constricted between the seeds, with a woody wall. Seed ellipsoid to broadly ellipsoid; testa crustaceous; endosperm hard. Seedling with epigeal germination; cotyledons not emergent; hypocotyl elongated; leaves arranged spirally on the orthotropic leader, distichous on the branches.
Early growth of planted X. ferruginea is fairly rapid, with a mean annual increment of about 1 m in height and about 3 cm in diameter during the first 3-5 years. The tree form of Xylopia is according to Roux's architectural tree model, characterized by a continuously growing monopodial orthotropic trunk with plagiotropic branches and distichous leaf arrangement, flowering does not influence the architecture. Flowers of X. ferruginea open at dusk and last for several nights; in Mindanao, the Philippines, it flowers from August to September and fruits from November to December. X. papuana has been observed flowering and fruiting in May-July and October. In Peninsular Malaysia X. stenopetala flowers regularly after the early year dry season, whereas X. malayana fruits in October and November. Fruits are eaten and dispersed by birds, mainly pigeons, and by squirrels, macaques and orang-utans.
Many of the Malesian species of Xylopia are still poorly known and are in need of a taxonomic revision.
Literature
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