Thumbergia grandiflora

Plants may grow to about 20 metres in height and have a long root system with a deep tap root, that can be as large as a small car. The stalked, opposite leaves, which have a rough surface, are quite variable in shape. They may be triangular or ovate and the margins may be toothed, lobed or entire. Length is up to 200 mm and width is up to 60 mm,which are typically smaller than the very similar T. laurifolia.

The blue to mauve flowers are about 8 cm across with a 4 cm long tube that is pale yellow inside. These are followed by pods containing seeds that are ejected several metres upon ripening. Plants also reproduce from segments that are washed down watercourses.