Hoya is a genus of 200–300 species of tropical plants in the dogbane family, Apocynaceae. Most are native to several countries of Asia such as China, India, Thailand, Malaysia, Vietnam, Bangladesh, and Indonesia. Common names for this genus are waxplant, waxvine, waxflower or simply hoya. Hoyas are evergreen perennial creepers or vines or rarely, shrubs. They often grow epiphytically on trees; some grow terrestrially, or occasionally in rocky areas. They climb by twining, and with the employment of adventitious roots.