Thunbergia natalensis Hook.

Dwarf shrub, herbaceous, ± 0.75-1 m high; stems puberulous. Leaves sessile or with petioles up to 28 mm long; blade elliptic to ovate, (21-)55-110(-159) x (15-)35-70(-82) mm, apex acute, base cordate, margin entire, lobed or toothed. Flower bracts 17-27 x (10-)12-15(-20) mm, light green with conspicuous venation; with pin-like glands, ± 1 mm long, caducous. Calyx 1.5-6 mm long; connated at the base, unequally shortly lobed; unicellular trichomes present. Corolla with lobes 12-17 x 13-20 mm, lobes light blue to purplish blue; tube 23-31 mm long and 2-18 mm in diameter, inside yellow to white with purplish blue to light blue stripes running from the lobes, outside light blue to purplish blue. Filaments 7-10 mm long, with stipitate glands, anther thecae 2.2-3.2 mm long, spurs conspicuously curved. Style 13-17 mm long with pin-like glands. Stigma funnel-shaped with pin-like glands and lateral clusters of multicellular trichomes. Fruit pubescent; 21-30 mm long, globose base 8-17 mm in diameter; stalk (26-)35-76(-89) mm long. Seed reddish-brown; surface ridged; 4.5-6.5 mm in diameter.