Rhododendron is a succulent plant of Rhododendron in Apocynaceae, which is native to Namibia. It is a typical xerophyte. Its succulent stems are 1.5-2 meters high and unbranched. Only after the growth point was destroyed, several new branches grew under the wound. Stems are densely covered with 2-5 cm long thorns; The thorns are very distinctive. Although there is no thorn base, the three thorns are still born together. The two long thorns are separated in a figure of eight with a short thorn in the middle. The thorns are grayish brown, and the leaves are born under the three thorns, which can be used to arrange special gardens in botanical gardens.