I just snapped this photo of Euphorbia corollata in our garden. This amazing North American native is virtually unknown in gardens, despite being easy to grow and having amazing flower power through the summer. In the wild, it grows in deep shade, where it barely flowers. Instead, plant it in full sun with cacti and it becomes a flowering machine.
I still do not understand how such disparate species can all be euphorbias. What does the DNA indicate? this plant looks nothing like poinsettia or crown of thorns or E.obesa ,E.trigona, lactea
Although this euphorbia lacks the bracts of a poinsetta, the actually flower parts are quite similar.