Typification, revision of the synonymy and range extension of Craniolaria integrifolia (Martyniaceae)

Here, I review the synonymy of Craniolaria integrifolia and typify this name and its synonyms, including the taxonomically complicated species C. argentina. The distribution of C. integrifolia is also greatly extended by the discovery of a gathering of this species from Piauí, north-eastern Brazil, and the recognition of overlooked gatherings from Rio Grande do Sul, southern Brazil, where the type specimen most probably originated from. An updated identification key to the species of Craniolaria is also provided.