[Cal-IPC] Invasive: Delairea odorata (Senecio mikaniodes) (Cape-ivy, German-ivy) is a perennial vine (family Asteraceae) found along the coast of California and in the San Gabriel Mountains. Cape ivy is especially problematic in coastal riparian areas, though it may also invade inland riparian areas, moist forests, and oak woodlands. Vines are known to form dense mats of vegetation over trees and shrubs, killing plants underneath. It is toxic to animals and fish can be killed when plant materials are soaking in waterways. Stem, rhizome and stolon fragments resprout if left in the ground after treatment. Can occasionally reproduce by seeds in some areas. Cal-IPC Rating: High (link added by Mary Ann Machi)

[Wikipedia] South Africa native, Description, Invasive: Delairea is a plant genus within the family Asteraceae that is native to South Africa. Classified within the tribe Senecioneae, it contains only one species, Delairea odorata, which was previously included in the genus Senecio as Senecio mikanioides.[4] It is known as Cape ivy in some parts of the world (US) and German ivy[5] in others (Britain, Ireland). Other names include parlor ivy and Italian ivy.[6] It is a twining perennial, herbaceous plant that grows 3 metres tall.[7] Its multi-lobed leaves somewhat resemble those of the unrelated English ivy. Originally used as an ornamental plant on trellises and as groundcover, it is now rarely cultivated because of its invasiveness, in addition to being a weed. (link added by Mary Ann Machi)