This plant is endemic to Madagascar. Columnar Growth Form, May or May Not Branch, Large Wide Dark Green Leaves, Beautiful Stem Patterns Left by Old Leaf Scars. Keep out of strong sun and water in the summer but let it dry out during the winter. The flower is red/orange color.
NOTE: All succulent Euphorbia leak a white milky sap when cut or damaged. This sap can be very irritating to the skin and especially the eyes. Different people have different reactions. Make sure to wash away any sap from your hands/clothes/tools. Handle with care.