Thunbergia grandiflora is an evergreen vine in the family Acanthaceae. It is native to China, India, Nepal, Indochina and Burma and widely naturalised elsewhere. Common names include Bengal clockvine, Bengal trumpet, blue skyflower, blue thunbergia, blue trumpetvine, clockvine, skyflower and skyvine.
Plants may grow to about 20 metres in height and have a long root system with a deep tap root. The stalked, opposite leaves, which have a rough surface, are quite variable in shape. They may be triangular ...