Green Euphorbia Cactus. This is a cactus-type Euphorbia with thick, succulent, deep green stems and small, though tough and sharp thorns. Leaves are sometimes formed where the thorns emerge from the stems. I have not been able to properly identify this euphorbia, but it has proven to be a strong upright grower and an excellent container plant. It excels as a tall specimen in a combination succulent planter. Sold in a 4″ pot 14 fl. Oz. (414 ml).