A new combination in Strophopappus (Asteraceae, Vernonieae, Lepidaploinae).

Revisions of herbarium collections reveal a new combination in Strophopappus (Asteraceae, Vernonieae, Lepidaploinae). Strophopappus comprises nine species occurring in South America, eight of which are endemic to Brazil. Currently, Vernonia riedeliana is treated as a synonym of Strophopappus bicolor. However, after morphological analysis of herbarium specimens and study of the protologue, V. riedeliana is hereby re-established as an accepted species and transferred to Strophopappus. A nomenclatural revision with a complete description, distribution map, and taxonomic notes are provided.