are Rhoicissus and Commidendrum different genus
Rhoicissus Rhoicissus is an Afrotropical plant genus in the grape family Vitaceae and Vitoideae subfamily. There are between 9 and 22 accepted species.
Ricinus Ricinus communis, the castorbean or castor-oil-plant, is a species of perennial flowering plant in the spurge family, Euphorbiaceae. It is the sole species in the monotypic genus, Ricinus, and subtribe, Ricininae. The evolution of castor and its relation to other species are currently being studied using modern genetic tools. It reproduces with a mixed pollination system which favors selfing by geitonogamy but at the same time can be an out-crosser by anemophily (wind pollination) or entomophily (insect pollination).