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.
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Selected literature:
Grant Downton R. (1998) African sunsets: polymorphism in Thunbergia alata. New Plantsman 5(4): 214-218.