Machilus is a genus of roughly 100 species of evergreen trees and shrubs belonging to the laurel family Lauraceae, order Laurales. The genus ranges across temperate, subtropical, and tropical forests of East and Southeast Asia, with species recorded from China, Korea, Japan, Taiwan, Indochina, the Indian subcontinent, Malaysia, Indonesia, and the Philippines.
Plants in this genus can reach heights of up to 30 metres, though many species are smaller shrubs or understory trees. Their leaves are alternate, entire (smooth-margined), and pinnately veined — a characteristic shared with many members of the laurel family. The bisexual flowers are small and arranged in paniculate inflorescences that are typically terminal, subterminal, or arise near the base of branchlets. The perianth consists of six lobes in two series; nine fertile stamens are arranged in three series, with the third series bearing glands, a diagnostic feature of the genus. Fruits are fleshy and globose, subtended at the base by persistent and reflexed perianth lobes — a distinctive hallmark distinguishing Machilus fruits in the field.
The genus has a contested boundary with the closely related Persea, which includes the commercially important avocado. Some taxonomic treatments sink Machilus entirely into Persea, while others treat them as distinct genera; as recognised here, Machilus is restricted to Old World (Asian) species, with American representatives placed in Persea.
Etymology
The name Machilus is of uncertain classical derivation; it has been used since early botanical literature for this Asian group of laurels. The genus name has no widely documented meaning separate from its application to these plants.
Distribution
Machilus occurs across a broad arc of East and Southeast Asia, inhabiting temperate, subtropical, and tropical forests. Its range spans China, Korea, Japan, Taiwan, Indochina, the Indian subcontinent (including Arunachal Pradesh), Malaysia, Indonesia, and the Philippines. The genus is predominantly a lowland to montane forest element, absent from the Americas where its close relatives in Persea occur.
Taxonomy Notes
The circumscription of Machilus relative to Persea has been debated for decades. Some authorities treat the two as congeneric, placing all Machilus species within Persea; others recognise Machilus as a distinct Old World genus separate from the New World–centred Persea. Intermediate treatments place individual species such as coyo (Persea schiedeana) into Machilus. As accepted by GBIF, Machilus is an independent genus in Lauraceae with approximately 12 accepted taxa in that database (broader floristic treatments recognise around 100 species).
