Dischidia vidalii

Dischidia vidalii, commonly known as ant plant or kangaroo pocket, is a plant in the frangipani family Apocynaceae native to the Philippines. It is a climbing plant with clusters of pink or magenta flowers. Like some other species in the genus — e.g. Dischidia major — and in the related genus Hoya, this species has evolved a symbiotic relationship with ants. In addition to small, oval leaves the plant develops significantly larger, hollow leaves where additional roots grow, and these leaves are colonised by ants....read more on Wikipedia.