Delairea is a plant genus within the family Asteraceae. It is classified within tribe Senecioneae. It contains only one species, Delairea odorata, which was previously included in the genus Senecio as Senecio mikanioides, and is known as Cape ivy in some parts of the world and German ivy in others.
Delairea odorata is native to South Africa. The name Cape ivy is also used ambiguously for both Senecio angulatus and Senecio scandens, two different but related creepers. Both of these names have incorrectly been listed as synonyms over history, and these species have been confused regularly despite the visual differences.
Appearance and uses
Delairea odorata has 2 to 4 -inch multi-lobed leaves that somewhat resemble those of the unrelated English ivy. Its flowers are yellow. A feature that distinguishes it from Senecio angulatus are the small appendages at the base of the stalks of the leaves that are shaped like an ear.
This plant is grown as an ornamental houseplant for its foliage.
Delairea odorata is a vine that climbs up trees and will reach heights of five metres in suitable climates. Given time it will smother trees.
Ecological impact and control methods
Delairea odorata has become an invasive species in California, Hawaii, Oregon, New Zealand and Australia. The plant will cover shrubs and trees, inhibiting growth and will also cover ground intensively over a wide area, thereby preventing seeds from germinating or growing. It is also toxic to animals who eat it and to fish where it trails into waterways.
The creeper can be controlled or eliminated by a combination of physical and chemical methods. Unless the root system is removed or poisoned the plant will regrow. Young plants can be pulled out with their roots but older plants will break off leaving the roots in place.
- Integrated Taxonomic Information System Organization (ITIS) (1999). "Delairea Lem". Integrated Taxonomic Information System on-line database. Retrieved 2008-03-31.
- Natural Resources Conservation Service (NRCS). "PLANTS Profile, Delairea Lem". The PLANTS Database. United States Department of Agriculture,. Retrieved 2008-03-31.
- The Plant List, Delairea odorata Lem.
- Eda, Sayaka (1999). "The Biogeography of Cape Ivy (Delairea odorata)". Retrieved 2007-05-20.
- "BSBI List 2007" (xls). Botanical Society of Britain and Ireland. Retrieved 2014-10-17.
- Delairea odorata (=Senecio mikaniodes)(Cape Ivy, German Ivy) (27.Jun.2015)
- North Hawaii News: Miracle moth from Madagascar (7.Oct.2014)
- Crockett, James (1972). Foliage House Plants. New York, NY: Time-Life Books. pp. 142–143.
- Nelson, Dave (1999). "Invasive Exotic Cape Ivy". Retrieved 2007-05-07.
- Greater Wellington Regional Council, New Zealand. "Greater Wellington - German ivy (Senecio mikanioides)". Archived from the original on October 15, 2008. Retrieved 2008-01-16.
- Greater Wellington Regional Council, New Zealand. "Greater Wellington - Cape ivy (Senecio angulatus)". Archived from the original on October 15, 2008. Retrieved 2008-01-16.
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