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The paper provides an identification key and an annotated list of all six species of the genus    Ridsdalea    J.T.Pereira &amp; K.M.Wong (  Rubiaceae  ,   Gardenieae  ) recorded in the flora of Vietnam, along with data on their valid names, synonyms, types, and distribution. A new species,    R.   backanensis   , discovered in the limestone area of Bac Kan Province (northern Vietnam), is described and illustrated. Detailed data on its characters, ecology, distribution, phenology, preliminary IUCN conservation status, and taxonomical notes are given. The newly discovered species is potentially interesting for cultivation as an ornamental tree that may be effectively used in garden and urban green architecture.

﻿Checklist of the genus Ridsdalea ( Rubiaceae , Gardenieae ) in Vietnam with description of the new species R. backanensis

Checklist of the genus Ridsdalea ( Rubiaceae , Gardenieae ) in Vietnam with description of the new species R. backanensis