A revision of the genus Heteromorpha (Apiaceae)

The genus Heteromorpha is revised. Seven species (including seven varieties) are recognized. Eight species from Madagascar are excluded. The name H. stenophylla Welw. ex Schinz is reinstated and H. transvaalensis Schltr. and H. Wolff is considered a variety of it. A new species, H. occidentalis P. J. D. Winter, is described. A narrower view of H. arborescens (Spreng.) Cham. and Schltdl. than that of recent authors is applied; the species is subdivided into five varieties. Two of these, var. frutescens P. J. D. Winter and var. montana P. J. D. Winter are new. The circumscription of H. involucrata Conrath is broadened to accommodate other central African forms of the species; H. stalzii H. Wolff is added to the synonymy. Data are analyzed cladistically and the supposed phylogeny is presented in the form of a cladogram.