- Natives of India, these vines were introduced to the region as ornamentals. They invade lowland rainforest and river systems, and smother, strangle, and kill native plants. Often their weight pulls down mature trees. These also infest cleared land.
- Most reproduction in North Queensland is vegetative. Thunbergias grow readily from their tuberous root and spread over long distances when flooding transports tuber fragments.
- Perennial vines twining to 15 m with numerous tuberous roots and large lignotubers.
- Branches are 4-angled, often grooved longitudinally.
- Leaves green, opposite, triangular with scalloped or lobed edges and narrowing to a pointed tip, 15 cm long, 10 cm wide.
- Large, trumpet-shaped flowers, white on he outside, yellowish inside, expanding to five rounded pale lavender-blue petals, one larger than the others, 8 cm long and 6-8 cm across.
- Seedpod is inconspicuous, cone-shaped, 3-5 cm long.
- Seed flat, 1 cm long, covered with brown scales.