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.
Ellipanthus tomentosus Ellipanthus tomentosus is a plant in the family Connaraceae. The specific epithet "tomentosus " is from the Latin meaning "thickly covered with hairs", referring to the leaves.