If you are looking for something different to grow on an obelisk, cane teepee or trellis then why not try a Black-eyed Susan. Thunbergia is completely unrelated to Rudbeckia hirta, an herbaceous annual or short-lived perennial in the daisy family.
Above is Thunbergia grandiflora an evergreen vine. The blue to mauve flowers are about 8 cm across with a 4 cm long tube that is pale yellow inside. Common names include Blue Skyflower and Skyvine. It is a houseplant in temperate climates.
Thunbergia alata – Black Eyed Susan is a herbaceous perennial climbing plant species in the Acanthaceae family. An eye-catching day beautiful five petalled flower with a jet black eye. This easy annual used to be regarded as a conservatory climber for growing in tubs, soil borders or from hanging baskets, but in recent years it has become a popular subject for outdoor cultivation, both in baskets, pots and in more protected corners of the garden
T. ‘Salmon Shades’ is a tender, evergreen, twining climber, often grown as an annual, with triangular to ovate, toothed, dark green leaves and, from summer to autumn, flowers in shades of pale yellow, salmon, and pink until the first frosts. A similar variety is T. alata ‘African Sunset’ which has flowers in all the colours of a spectacular sunset and looks lovely with other apricot and purple shades.