Do Calothamnus and Grewia belong to the same genus?
Calothamnus: Calothamnus is a genus of shrubs in the family Myrtaceae and is endemic to the south-west of Western Australia. Grewia:  However, these were both not monophyletic with respect to other Malvales - as already indicated by the uncertainties surrounding placement of "Grewia" and similar genera - and have thus been merged into the Malvaceae. Grewia:  Together with the bulk of the former Sparrmanniaceae, "Grewia" is in the subfamily Grewioideae and therein the tribe Grewieae, of which it is the type genus.
no