Perennial glabrous twiner to 15m. Lenticellate woody stems. Dentate leaves to 180mm x 200mm. Cymes of 1-10 flowers, coriaceous sepals to 25mm x 15mm, larger in fruit. Bright chrome yellow corolla, tube to 50mm x 10mm with a crenate-dentate limb 70mm diameter. Fruit to 21mm x 23mm.