are Cladanthus and Oxydendrum both plant genus ?
Oxydendrum Sourwood or sorrel tree, Oxydendrum arboreum, is the sole species in the genus Oxydendrum, in the family Ericaceae. It is native to eastern North America, from southern Pennsylvania south to northwest Florida and west to southern Illinois; it is most common in the lower chain of the Appalachian Mountains. The tree is frequently seen as a component of oak-heath forests.
Cladogynos Cladogynos is a genus of shrubs in the family Euphorbiaceae, first described as a genus in 1841. It contains only one known species, Cladogynos orientalis, native to Southeast Asia (Thailand, Vietnam, Cambodia, Malaysia, Indonesia, Philippines) and southern China (Guangxi Province).