A new species from Liberia and Côte d'Ivoire, Chassalia bicostata O. Lachenaud & Jongkind, is described and compared with its two close relatives, C. pteropetala (K. Schum.) Cheek and C. pleuroneura (K. Schum.) O. Lachenaud, both from central Africa. The latter is here transferred to Chassalia from Psychotria . All three species share deeply bifid stipules, which are an unusual feature in Chassalia . Full descriptions and illustrations are given for the three taxa.
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Lachenaud et al. (2009) studied this question.