Willughbeia edulisRoxburgh W (1820) Plants of the Coast of Coromandel 3: 77. or rubber vine fruit is a vine species bearing tropical fruit in the family Apocynaceae.
Taxonomy Its species epithet edulis comes from Latin which means "edible". In fact, it is one of the rare climbing plants of Southeast Asia of which the fruits are eatable.
Description It is a yellow sour edible fruit found in: India, Indo-China (Cambodia, Myanmar, and Isan (northeastern) with Chanthaburi Province of Thailand as well as Vietnam) include Peninsular Malaysia. It may be known under a number of synonyms including "Willughbeia cochinchinensis".Kuy fruit
After its reddish lenticelled stems are excised, they exude a milky latex which produces a rubber called chittagong. The roots can be used as a red dye and it may be used medicinally in parts of Asia including Cambodia.
Vernacular names Local names include: (គុយ) in Cambodia; gedraphol, laleng-tenga, bel-tata in India; (ต้นคุย), (เถาคุย), (เครือ), and (กะตังกะติ้ว) in Thai; (บักยางป่า) in Isan dialect. in Myanmar; and in Vietnamese.http://www.foodplantsinternational.com/index.php?sec=plants&page=simple_info&plantid=17519&nocache=1 Food Plants International Helping the Hungry Feed Themselves
in Indonesia refers to a similar edible relative, W. sarawacensis.
References
External links W. Plant Data: Edulis (Thai)