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FOC | Family List | FOC Vol. 13 | Thymelaeaceae

1. Aquilaria Lamarck, Encycl. 1: 49. 1783.

沉香属 chen xiang shu

Authors: Yinzheng Wang, Lorin I. Nevling & Michael G. Gilbert

Agallochum Lamarck; Ophispermum Loureiro.

Trees or treelets. Leaves alternate, leaf blade pinnately veined; veins slender, ascending toward margins and joining several intramarginal veins. Inflorescences axillary or terminal, umbelliform or paniculiform, usually without involucre; peduncle short or absent. Flowers bisexual, pedicellate, usually 5-merous. Calyx tube persistent, yellow or yellowish green, campanulate; lobes 5, reflexed or erect. Petaloid appendages twice as many as the lobes, inserted at throat of tube, scalelike, united in a ring at base, usually densely pubescent or puberulous. Stamens twice as many as calyx lobes, alternating with petaloid appendages; filaments short or absent; anthers oblong, dorsifixed, pubescent, connectives broad. Disk absent. Ovary subsessile, pubescent, 2-loculed or incompletely 2-loculed; style very short; stigma capitate. Fruit a 2-valved loculicidal capsule, compressed laterally, obovoid, base enclosed by persistent calyx; pericarp leathery or woody. Seeds 2 or 1 by abortion, ovoid or ellipsoid, on carunclelike strongly tapered funicle; testa crustaceous, endosperm absent; cotyledons thick, plano-convex.

About 15 species: Bhutan, Cambodia, China, NE India, Laos, Malaysia, Myanmar, Thailand, Vietnam; two species (both endemic) in China.

Members of this genus are important as the source of agarwood, a very highly prized aromatic gum produced in the wood in response to injury. It is used as incense, in perfumery, and in traditional medicine. Trees have been over-harvested throughout the range of the genus, and most species are of conservation concern. The genus as a whole is included in Category 2 of CITES.

1 Pericarp thickened, slightly rugose when dried; seeds densely brown-yellow pubescent, funicle 0.8-1 cm, slightly shorter or longer than seed; leaves 2-4 cm wide.   2 A. yunnanensis
+ Pericarp thin, smooth when dried; seeds white sericeous or glabrous, funicle ca. 1.5 cm, longer than seed; leaves 2.8-6 cm wide.   1 A. sinensis

Lower Taxa


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