Sempervivum royanum, usually sold as Sempervivum tectorum 'Royanum', is a mat-forming succulent with rosettes of fleshy, yellowish-green …
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Epithet: royanum
Meaning: Of or pertaining to Roya
Derivation: A Latinized toponymic epithet formed from the proper noun Roya, referring to the Roya Valley in the southwestern Alps and the Latin suffix -anum (the neuter form of -anus, meaning "of or pertaining to").
Pronunciation: roy-AH-num
While the generic name must be unique, two or more genera often share the same specific epithet. Moreover, the same epithet can be used for subspecies, varieties, and forms within a species. Here is a list of plants that share this epithet.