(Cryptostegia grandiflora and C. madagascariensis)
- Fast growing, climbing plant usually with pinkish-purple flowers (sometimes white to pink or light purple). Can also grow as a bush.
- Shiny, dark green leaves that are about 7 cm (3 in) long, with triangular, 10 cm long (4 in) seedpods that grow in wing-like pairs.
- Native to Madagascar, introduced to Hawaii as drought-resistant ornamentals
- Grows over other plants and trees to 13 m (45 ft) high, smothering and killing other vegetation.
- Twines tightly around other plants and restricts their growth.
- Extremely poisonous: it contains cardiac glycosides, which interfere with heart operation in humans and animals when the plant is eaten.
- When the vine is dry, a powdery dust emerges and can cause violent coughing, swelling of the nose, and blistering of the eyelids.
- Contact with the plant’s milky sap can cause burning rashes and blisters.
- Each seedpod contains 340-840 seeds, silky hairs on seeds allow them to spread by wind and water, seeds are also known to float and survive for a month in salt water before being washed ashore to sprout.
- Introduced to Western Australia, now considered one of the 10 worst invasive plants.
Limited populations in Kekaha, Kalaheo, Poipu, Lihue, Wailua, and Princeville. KISC is currently educating the public about the invasiveness of this species.
You can plant pono by reporting Rubbervine to KISC at 808-821-1490 or firstname.lastname@example.org . KISC crew members can remove it from your landscaping free of charge and help identify suitable replacements.