Thunbergia alata Sims (trop. Afr.) – Frequently cultivated as an ornamental (perennial but grown as an annual in western Europe). Exceptionally seen as an escape, for instance on foot of walls in Gent in 2013.
Selected literature:
Grant Downton R. (1998) African sunsets: polymorphism in Thunbergia alata. New Plantsman 5(4): 214-218.