A Systematic Review of Phytoconstituents and Tissue Culture Studies of the genus Hoya R. Br.

The genus Hoya (Family: Apocynaceae) has more than 500 species, comprising mainly of epiphytes and geographically distributed in South America, Southeast Asia, Indo-Malesia and Australian regions. Most of the species are cultivated for their ornamental, aromatic and showy flowers. Philippines is one of the countries with the highest diversity of Hoya species. As seed setting is very rare in most of the species, it necessitated the development of conservation strategies through ex situ conservation methods using vegetative or micropropagation techniques. Present chapter provides detailed information on the traditional uses, phytoconstituents, conservation status and micropropagation studies of the ornamental and medicinally important genus Hoya.