In (post-)classical Latin the form "stemma" is attested as Greek loanword. The method takes its name from the word "stemma". This necessitated the creation of stemma, or lines of descent among books. Stemmata (singular stemma) are a class of simple eyes. The stemma of the Kangyur have been well researched in particular by Helmut Eimer. Virtus non stemma is Latin for "Valor, not garland". In Ancient Greek and Latin, "stemma" is of neuter gender. The genus name comes from Greek "kyphos", meaning "hump", and "stemma", meaning "garland".