Sempervivum arachnoideum 'Rubrum' (Red Cobweb Houseleek) is a low-growing succulent that forms a mat of rosettes of fleshy, ruby-red …
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Epithet: rubrum
Meaning: Red; ruddy
Derivation: The neuter form of the Latin adjective ruber.
Pronunciation: ROO-brum
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.