Oxypetalum karstenianum Goyder & Rapini, nom. nov.

Basionym: Schistogyne decaisneana Karsten (1866: 121), (non Oxypetalum decaisneanum Meyer 1951: 361). Type:

BRAZIL. Rio Grande do Sul: no locality, no date, A . Isabelle s.n. (holotype P!) .

Etymology:—The new name of this species honours C. W. Herman Karsten who recognised it as distinct from the rest of the material identified by Decaisne (1844) as Schistogyne sylvestris .