Claim: Thunbergia gregorii, an evergreen vine that grows up to ten feet tall, looks similar to the black-eyed Susan vine, which is also known as Thunbergia alata, and is native to east Africa.
Evidence: Thunbergia gregorii is an evergreen vine that grows to 8–10 ft. tall, or if left without support can become an extensive groundcover. It looks like the related black-eyed Susan vine (T. alata), but without the black eye. Thunbergia gregorii is native to east Africa, and is pollinated by bees.