Argyreia roxburghii

Argyreia roxburghii (Sw.) Choisy, Mém. Soc. Phys. Genève 6: 419 (1833 publ. 1834). (Syn: Argyreia ampla Choisy; Argyreia burneyi Gage; Argyreia multiflora Voigt; Convolvulus roxburghii Wall.; Ipomoea multiflora Roxb.; Ipomoea roxburghii Sweet; Rivea multiflora Hallier f.);

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Nepal to Thailand: Assam, Bangladesh, East Himalaya, Myanmar, Nepal, Thailand as per POWO;
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References:
POWO  Catalogue of Life  The Plant List Ver.1.1  Tropicos  GBIF specimens- one and two (High resolution specimens) Annotated checklist of Flowering plants of Nepal  Pan India Bouquets  India Biodiversity Portal  Convolvulaceae Unlimited  SEINet Portal Network