Between Platycarya and Houttuynia, which has more species within the genus?
Platycarya Platycarya is a genus of flowering plants in the family Juglandaceae, usually treated as comprising a single species Platycarya strobilacea, though one to two additional species are accepted by some authors. It is native to eastern Asia in China, Korea, and Japan.
Hoya aldrichii Hoya aldrichii , commonly known as the Christmas Island Waxvine is a species of flowering plant in the Apocynaceae or dogbane family. It is a vine that is endemic to Christmas Island, an Australian territory in the north-eastern Indian Ocean, where it is a common epiphyte in the shrublands of the island’s coastal terraces. The specific epithet honours Captain Aldrich, commander of the survey vessel HMS "Egeria", which visited Christmas Island in 1887.