Pelargonium conradiae (Geraniaceae), a new species in section Ligularia from Worcester, Western Cape, South Africa

•Pelargonium conradiae is a new species allied to P. oreophilum.•The new species is endemic to the northeastern foothills of the Riviersonderend Mtns.•It is diagnosed by its large, pure white or pale pink flowers.•A revised key is presented to the four species of the Pelargonium hirtum group.

Pelargonium conradiae is a new species of section Ligularia from southeast of Worcester, allied to Pelargonium hirtum but characterised by its larger, unmarked white or pale pink flower with petals 15–20 mm long, and stipules adnate to the petioles for more than half their length. It is one of several locally endemic species from the northeastern foothills of the Riviersonderend Mountains that have been discovered in recent years. The new species is fully illustrated and we provide a revised key to the species of the P. hirtum group of sect. Ligularia.