Abstract
Based on new collections of Machilus from three locations in Cambodia, six species including four new species are recognized: Machilus angustifolia sp. nov., M. bokorensis Yahara & Tagane, M. brevipaniculata Yahara & Tagane, M. cambodiana sp. nov., M. elephanti sp. nov., and M. seimensis sp. nov. Those species are characterized by DNA sequences of rbcL, matK and ITS and vegetative traits of leaves, young twigs and terminal buds. Among four species collected from the same locality, M. angustifolia and M. brevipaniculata have naked terminal buds, but are distinguished by leaf shape and are not close in the ITS tree; M. bokorensis and M. elephanti have scaly terminal buds but are distinguished by the size and morphology of their terminal buds and are not clustered together in the ITS tree. Two additional species differ in their terminal buds, naked in M. cambodiana and scaly in M. seimensis, and are not clustered together in the ITS tree. Four new species are described by comparison with related species and their conservation status is qualified. A new name M. kerrii comb. nov., based on Phoebe kerrii Gamble, is made.
