Hoyas are evergreen perennial creepers or vines or rarely, shrubs.Common names for this genus are waxplant, waxvine, waxflower or simply hoya.
This genus was named by botanist Robert Brown, in honour of his friend, botanist Thomas Hoy.
Larger species grow 1–18 m (3–59 ft), or more, with suitable support in trees. They have simple entire leaves, arranged in an opposite pattern, that are typically succulent.
Hoya flowers are all shaped like five pointed stars. Some of the species' petals reflex so far that the flowers appear to be round or ball-like.
Hoya carnosa has been shown in recent studies at the University of Georgia to be an excellent remover of pollutants in the indoor environment.
Various cultures have used hoyas medicinally, especially Polynesian cultures.Some are toxic to livestock and sheep poisonings in Australia are reported.
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Information source-https://en.wikipedia.org/wiki/Hoya