1) Dicot genus 2) Genus catharanthus 3) Magnoliopsid genus 
Catharanthus is a genus of flowering plants in the dogbane family, Apocynaceae. Like genus Vinca, they are known commonly as periwinkles. There are eight known species. Seven are endemic to Madagascar, though one, C. roseus, is widely naturalized around the world. The eighth species, C. pusillus, is native to India and Sri Lanka. The name Catharan...
[n] - small genus of erect annual or perennial herbs native to Madagascar
genus Catharanthus noun small genus of erect annual or perennial herbs native to Madagascar; widely naturalized in the tropics; formerly included in genus Vinca