Thorny Plant with Three-Spike Groups: Likely Euphorbia (Crown of Thorns)

Identifying a Spiny, Upright Succulent

A plant has an upright trunk covered in groups of three spines, with a single slender leaf growing between the bottom two spines of each group. Lower leaves drop off; the plant was near death from drought when acquired.

Expert Guess: Euphorbia (Crown of Thorns Family)

The description suggests a Euphorbia species, possibly crown of thorns (Euphorbia milii) or relative. Key check: does it exude white, milky sap when cut or leaves torn? Any flowers observed?

Verification

If the milky sap test is negative, the expert will continue working on identification. Photos would help confirm.