Cladostemon is a monotypic genus of flowering plants in the caper family, Capparaceae (order Brassicales), containing the single species Cladostemon kirkii (Oliv.) Pax & Gilg, commonly known as three-fingerbush. Its taxonomic status is disputed: GBIF maintains Cladostemon as an accepted genus, while the Christenhusz & Byng reclassification adopted by Wikipedia places it under Crateva as Crateva kirkii. The wider Crateva clade, into which Cladostemon is subsumed by some authorities, comprises trees or shrubs with palmately compound 3-foliolate leaves, 4-petaled white to yellow flowers with numerous stamens (12–50) fused into a short androgynophore, and globose to ellipsoid berry fruits. The sole species Cladostemon kirkii is native to southeastern Africa and was originally described from material collected by Sir John Kirk, after whom it is named. A historical synonym is Cladostemon paradoxus A.Br. & Vatke.
Etymology
The genus name Cladostemon derives from Greek klados (branch) and stemon (stamen), referring to the branching stamens characteristic of the plant. The specific epithet kirkii honors Sir John Kirk (1832–1922), the Scottish naturalist and companion of David Livingstone who collected the type specimen in East Africa.
Distribution
Cladostemon kirkii is native to southeastern Africa, with confirmed observations in Zimbabwe (Chiredzi, Masvingo, Manicaland), Eswatini (Lubombo), and South Africa (northern KwaZulu-Natal / uMkhanyakude District). GBIF records no formal distribution data for the genus or species.
Taxonomy Notes
The taxonomic status of Cladostemon is disputed. GBIF treats it as an accepted monotypic genus in Capparaceae. However, the reclassification by Christenhusz & Byng — reflected on Wikipedia — subsumes it into Crateva as Crateva kirkii (Oliv.) Christenh. & Byng, alongside several other former Capparaceae segregates. This conflict mirrors a broader tension between traditional Capparaceae sensu stricto and the expanded circumscription adopted in some recent phylogenetic treatments.
