Ipomoea pileata Roxb., Fl. Ind., ed. 1820 2: 94 1824. (syn: Convolvulus involucratus Spreng.; Convolvulus pileatus (Roxb.) Spreng.; Convolvulus trichocalyx Zoll. & Mor.; Elythrostamna convolvulacea Boj.; Ipomoea peltata Heyne ex Wall.; Milhania involucrata (Spreng.) Rafin.);  

China (Guangdong, Guangxi, Hainan, Yunnan), Cambodia, India, Bangladesh, Indonesia, Laos, Philippines (Culion), Sri Lanka, Thailand, Vietnam, Java, peninsular Malaysia (Perlis), Sumatra (Bangka Isl.), Borneo, Myanmar [Burma] (Bago, Taninthayi), South Africa (Mpulamanga), Namibia, Botswana, Zambia, Zimbabwe, Malawi, Mozambique, Gambia (introduced), D.R. Congo (Zaire), Angola, Central African Republic, Comores (Mayotte, etc.), Madagascar, Kenya, Tanzania, Zanzibar, Pemba Isl., Bioko Isl. (Fernando Poo), Chad, South Sudan, Burkina Faso, Mali, Senegal, Gambia, Togo as per Catalogue of Life;

Plant identification (mixed thread): 19 posts by 4 authors. Attachments (1) - 5 MB. 

This plant is also from Lumami-Nagland. Flower buds and flower emerging from leaf. Pic-2

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Family seems to correct and I suspect the species of Ipomia. 

Pl. check at 

Could not find a match in Convolvulaceae‎ leave alone in Ipomoea

It's Ipomoea pileata.. Synonym Ipomoea involucrata 

Thanks ... I think we are there.

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It's Ipomoea pileata.. Synonym Ipomoea involucrata- from ... in another thread.