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Argostemma pictum (Rubiaceae), a species occurring in Myanmar, Thailand, Laos and Peninsular Malaysia, is newly reported for the flora of Vietnam; a description, photographs, information on ecology and taxonomic notes are also presented. In order to facilitate identification, we provide an identification key and checklist to the 10 known Argostemma species in Vietnam.

Notes on taxonomy of the genus Argostemma (Rubiaceae) from Vietnam