Sui generis
In sociology, the "sui generis" is what has been externalized, then internalized in the overall public and becomes a part of society that simply exists in its construct. It is not something that is not thought to have been created, because it is imbedded in everyone's way of thinking and being. Instances include the idea of love, or going to school, or clothing belonging to a specific gender. These examples are "sui generis" for they simply exist in society and are widely accepted without thoughts of where they come from or how they were created.
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.