Pencil cactus or Pencil bush
Pencil cactus is actually not a cactus at all and has no thorns. It's a member of the same family (Euphorbia) as the holiday favorite, poinsettia. Like poinsettias and other related plants, the pencil cactus secretes a milky sap that irritates some peoples' skin. Other than that, this is an easy-going plant that requires very little care and almost no water. Read below the fold...