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The name Didymaea alsinoides (Schltdl. & Cham.) Standl. has been incorrectly applied to a common and wide-ranging Mexican and Central American species whose correct identity is Didymaea mexicana Hook. f. In this paper a lectotype is selected and designated for D. mexicana. The characters separating these two frequently confused species are discussed. Further systematic studies of the genus Didymaea are suggested.

Lectotypification of Didymaea mexicana Hook. f. (Rubiaceae, Rubieae) and the identity of D. alsinoides (Schltdl. & Cham.) Standl.