Lasianthus bidoupensis (Rubiaceae), a New Species from Southern Vietnam

A new species, Lasianthus bidoupensis V.S. Dang & Naiki (Rubiaceae) is described and illustrated from Bidoup Nui Ba National Park, Lam Dong Province, southern Vietnam. It resembles L. yaharae which was recently discovered from Mt. Hon Ba and L. dalatensis which is endemic to Dalat, southern Vietnam. However, L. bidoupensis differs from them by having larger leaves and bracts, longer petioles, stipules, calyx and corolla tubes, and deep-red mature fruits.