Cerbera floribunda, commonly known as cassowary plum, grey milkwood, or rubber tree, is a plant in the family Apocynaceae which is native to the region from Sulawesi to the Solomon Islands, including north east Queensland.
Cerbera floribunda is a tree that grows up to 30 m (98 ft) in height. The bark is brown to grey/black, and the sap wood and heart wood are both white. Leaves are lanceolate-elliptic, glossy green above and paler beneath, alternate or whorled and crowded towards the ends of the twigs. They measure up to 30 cm (12 in) long by 5 cm (2.0 in) wide, with 13 to 20 curved lateral veins and are attached by a long petiole up to 40 mm (1.6 in) long.
The inflorescence is a much branched cyme up to 17 cm (6.7 in) with usually more than 50 flowers. The flowers have 5 white sepals, a corolla tube up to 12 mm (0.47 in) by 3 mm (0.12 in) wide with 5 free lobes at the end. They are white with a pink or red centre, are about 25 to 30 mm (0.98 to 1.18 in) in diameter, and have a sweet scent.
Distribution and habitat
This is a tropical plant and favours abundant water. The native range is from Sulawesi, east through the Maluku Islands and New Guinea to the Soloman Islands, and south to Queensland; it is widespread throughout the range and not considered to be endangered. It is generally found along creeks and marshes and always near permanent water. Altitudinal range in Australia is from sea level to 500 m (1,600 ft).
Fruits are swallowed whole by cassowaries, who are not affected by the toxins contained within. They then excrete the seeds later, helping to distribute them. The cassowary is the only bird or animal able to provide this function, due to the size of the fruits, and this forms a classic example of a symbiotic relationship between the two species.
As with other species of Cerbera, and indeed many other species in the family Apocynaceae, fruits of this plant are toxic to humans. Cerbera species contain the cardiac glycoside cerberin, and if eaten will result in nausea, vomiting, abdominal pain, and potentially death. The white sap, which is produced from all parts of the tree, may also cause skin irritation on contact.
The timber has been used for mouldings and interior finishings in Bouganville and other parts of Papua New Guinea, and for carvings and medicine in the Solomon Islands.
- Botanic Gardens Conservation International (BGCI).; IUCN SSC Global Tree Specialist Group. (2019). "Cerbera floribunda". IUCN Red List of Threatened Species. 2019: e.T147004222A147004224. doi:10.2305/IUCN.UK.2019-2.RLTS.T147004222A147004224.en. Retrieved 16 February 2021.
- "Cerbera floribunda K.Schum". Plants of the World Online. Retrieved 16 February 2021.
- F.A. Zich; B.P.M Hyland; T. Whiffen; R.A. Kerrigan. "Cerbera inflata". Australian Tropical Rainforest Plants, Edition 8. Commonwealth Scientific and Industrial Research Organisation (CSIRO). Retrieved 14 February 2021.
- Forster, Paul I. "A TAXONOMIC REVISION OF CERBERA L. (APOCYNACEAE) IN AUSTRALIA AND PAPUASIA". JSTOR. Austrobaileya, vol. 3, no. 4, 1992, pp. 569 – 579. Retrieved 14 February 2021.
- Quigley, Declan; Fenwick, David (2019). "Cerbera sp. (Apocynaceae) drift mesocarps: first record from British waters and a summary of previous records from north-western Europe". Cahiers de Biologie Marine. 60: 419–423. doi:10.21411/CBM.A.A9AA3201. Retrieved 19 February 2021.
- Jones, Elizabeth; Curran, Lisa; Wright, Debra; Mack, Andrew (May 2008). "Differential effects of mammalian seed predators on the regeneration of five Papua New Guinean tree species and implications for sapling recruitment". Journal of Tropical Ecology. doi:10.1017/S026646740800494X. Retrieved 19 February 2021.
- "Cerbera floribunda K.Schum". Flora & Fauna Web. Singapore Government. Retrieved 19 February 2021.
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