Probably U. graminifolia or its allies, this bladderwort is imported from India by Kamihata Fish Industries ltd. in Himeji, Hyogo prefecture, Japan.
Compared to an ordinary form of U. graminifolia under cultivation, its scapes are strongly twining, flowers are slightly smaller, corolla is more bluish and its swelling of lower lip is less prominent.
Anyway, it IS a beautiful bladderwort!;)
stunning , is this the species that is used in aquariums?
Yes. This plant was imported for aquarium and dealers has dealt with it as thus, but I've decided to grow this as terrestrial because I wanted to see its flower.