Euphorbia cryptospinosa is a sparsely branched, erect or subscandent succulent shrub with a small tuberous root and narrow branches…
Meaning: With hidden spines
Derivation: Compound of two words, the prefix "crypto-," meaning "hidden" and feminine form of the Latin adjective "spinosus."
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.