Rostkovia is a genus of plant in family Juncaceae described as a genus in 1809. The genus is native to Ecuador, southern South America, New Zealand, and various antarctic and subantarctic islands. species 1. \n* Rostkovia magellanica (Lam.) Hook.f. - South Island of New Zealand, Antipodes Islands, Ecuador, southern Chile, southern Argentina, Falkland Islands, South Georgia Islands 2. \n* Rostkovia tristanensis Christoph. - Tristan da Cunhaformerly included moved to other genera: Marsippospermum Patosia