Picture taken at Shilparamam, Hyderabad by VP. I knew it as Gadiyar Phool, as it seems to resemble the face of a clock, but nowhere do I find that as a common name.
Common name: Blue Passion Flower, Common passionflower, Hardy passionflower
The blue passion flower is a great screening vine for a fence, has large exotic flowers, crowned with prominent blue- and purple-banded filaments. It climbs by tendrils that twine & pull the stems along. A woody vine capable of growing to 15–20 m height where supporting trees are available. Usually fragrant, it flowers almost all year round.
Botanical name: Passiflora caerulea (blue) Passiflora coccinea (red) Family: Passifloraceae (Passion flower family)
Info – Flowers of India