Buchanania is a genus of trees belonging to the family Anacardiaceae — the mango and cashew family — within the order Sapindales. The genus comprises approximately 26 accepted species distributed across tropical and subtropical Asia, northern Australia, and the western Pacific.
Members of Buchanania are trees with simple, unlobed leaves arranged alternately along the twigs. The flowers are borne in axillary or terminal panicles and are bisexual, meaning each flower contains both male and female reproductive organs. They typically have 5 calyx lobes and 5 petals, occasionally 4 or 6, and range in colour from pale green to white. Each flower has 10 stamens and 4–6 carpels, of which only one is fertile. The fruits are lens-shaped drupes with a bony or woody endocarp enclosing a single seed. A notable characteristic that sets Buchanania apart from most other members of Anacardiaceae is that it does not appear to cause contact dermatitis — a reaction common to many relatives such as poison ivy and mango.
The genus was established in 1801 by German botanist Kurt Polycarp Joachim Sprengel, based on plant material collected in what is now Myanmar by the Scottish naturalist Francis Buchanan-Hamilton. The genus name honours Buchanan-Hamilton as the original collector.
Etymology
The genus Buchanania was named by Kurt Polycarp Joachim Sprengel in 1801 to honour Francis Buchanan-Hamilton, the Scottish naturalist and physician whose plant collections from present-day Myanmar provided the type material for the genus.
Distribution
Buchanania is native to a broad arc from the Indian subcontinent (India, Sri Lanka, Nepal, Bangladesh, Assam) and southern China through Indo-China (Myanmar, Thailand, Cambodia, Laos, Vietnam) and Malesia (Borneo, Sumatra, Java, Philippines, Sulawesi, Maluku), extending to Papuasia (New Guinea, Solomon Islands, Bismarck Archipelago), northern Australia (Northern Territory, Queensland, Western Australia), and the western Pacific islands (Fiji, Samoa, Vanuatu, Caroline Islands).
Taxonomy Notes
The genus was erected in 1801 by German botanist Kurt Polycarp Joachim Sprengel and belongs to the family Anacardiaceae, order Sapindales. As of April 2024, Plants of the World Online recognises 26 species. Unlike many genera in Anacardiaceae, Buchanania lacks the urushiol-type compounds responsible for contact dermatitis in relatives such as poison ivy (Toxicodendron) and mango (Mangifera).
