Keys available at
Flora of Eastern Ghats: Hill Ranges of South East India, Volume 3 By T. Pullaiah (2007- details with keys)
A Revised Handbook to the Flora of Ceylon – Volume 10, Volume 10 By M. D. Dassanayake
Adenia cordifolia (Blume) Engl. (Java, peninsular Malaysia, Sumatra, Borneo, Palawan, Nicobars (Central Nicobars) as per Catalogue of Life)
Adenia trilobata (Roxb.) Engl. (India, Bhutan, Darjeeling, Myanmar [Burma] (Bago), Bangladesh as per Catalogue of Life)
Adenia cardiophylla (Masters) Engler (?Bhutan, Cambodia, India, Laos, Malaysia, Myanmar, Thailand, Vietnam)
Adenia (Passifloraceae) page with images of species in efloraofindia : 1 post by 1 author.
I request you to pl. go through & point out mistakes, if any. I hope this will aid in identifications in future. If anybody can send images of other species of this genera (for incorporation in the website), if any, or can identify unidentified images, it will be really nice.