These flowers can be spotted in the Singapore Botanic Gardens and West Coast Park. The plants are climbers and the flowers hang down the trellis in clusters often attracting huge, black bees. It must be a lot of work to maintain these plants that I am sure require constant trimming. I am just happy to see them in public parks because I do not have the energy to take care of plants such as these though it would be nice to be seeing flowers all the time in your own garden.
Thunbergia grandiflora 'Alba'