Euphorbia enopla (Pincushion Euphorbia) is a beautiful species, with energetic, shrubby, green succulent with fantastical, long ruby spines reminiscent of a sea urchin. It isn’t an actual cactus.

Here is one grown at Fullerton Botanical Garden.

Euphorbia Enopla or Pincushion Euphorbia

Euphorbai Enopla