Ridsdalea is an Asian genus of plants in the family Rubiaceae; it was named after Dr. (1944âÂÂ2017), who was an English botanist and specialist in tropical plants and the Rubiaceae family. The type species is Ridsdalea grandis <small>(Korth.) J.T.Pereira</small>, which was renamed from the basionym Gardenia grandis. Several other species have been reassigned from other genera: notably Rothmannia, which is now reserved for African species. Its native range is southern China, Indo-China, Malesia and New Guinea.
, Plants of the World Online accepts the following 33 species: