Euphorbia vulcanorum is a densely branched succulent shrub with green, 4- to 5-angled branches attractively marked with spine shields that…
Meaning: Fiery; of volcanoes or volcanic soils
Derivation: An inflected form of the Latin proper noun "Vulcānus," meaning "the god of fire and metalworking"
Whereas the generic name must be unique, there are often two or more genera with the same specific epithet. The same epithet can also be used within a species for subspecies, varieties, and forms.
Here is a full list of succulents with this epithet. Click on the photo or the name of the plant for which you wish to see further information.