Sui generis
Sui generis (; ) is a Latin phrase that means "of its (his, her, their) own kind; in a class by itself; unique."
Leucosidea
The genus name "Leucosidea" is a form of the Greek word "λευκός" ("leukos"), meaning "shining white", although in botany the root is more often used less specifically to indicate something of a generally white or gray appearance. The second or specific name "sericea" means "silky" and comes from "σηρικός" ("serikos"), which means both "silky" and "from the land of silk"; it refers to the silky hairs that cover the new buds and young leaves of the tree.