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Thunbergia sp.
Thank you, C. Daehler. I'll look into that. But based on the leaf drawings on the links, yes, they do look closer to T.grandiflora. Thanks again!:)
I'm wondering if this could be Thunbergia grandiflora. There are a lot of mislabeled pictures on the Internet, so with these two species, original drawings and keys from botanical journals may be the best way to distinguish. One major difference is the leaves. Compare the laurifolia original drawing from William Hooker (1800's)
http://commons.wikimedia.org/wiki/File:T...
versus authoritative drawing of grandiflora from Botanical Register (1820)
http://commons.wikimedia.org/wiki/File:T...
In general, I think grandiflora is more common than laurifolia in cultivation so my first suspicion when I see those flowers is grandiflora, but laurifolia is also out there, so both need to be considered.