Euphorbia tirucalli (Pencil Cactus/Tree, Milk/Bone Bush)

Euphorbia tirucalli, commonly known as Pencil Cactus or Pencil Tree, is a succulent shrub or small tree. It is native to Africa and has pencil-thin stems that are green and photosynthetic. The plant produces small leaves that are shed quickly, so it appears mostly leafless. It is a popular plant for arid gardens and containers.