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Cascabela thevetia
Also called Be Still Tree, Captain Cook Tree, Lucky Nut
In Singapore: Lucky Bean, Zetung, Jepun, Jitong, Yellow Oleander, Trumpet Flower, Daffodil Bush, Be-still Tree, Lucky Nut, Bunga Jepun, Zetun, Cook Tree, 黄花夹竹桃, White Oleander (Grown in Singapore)
Yellow oleander is an evergreen tropical shrub or small tree grown for its funnel-shaped yellow flowers, and it is highly poisonous. It thrives in full sun, heat and dry soil, and is treated as a container houseplant in frost-prone areas.
Cascabela thevetia (syn. Thevetia peruviana) is a species of poisonous plant in the dogbane family Apocynaceae, native throughout Mexico and Central America and cultivated widely as an ornamental. It is a relative of Nerium oleander and thus is known by the common name yellow oleander.
All parts of the C. thevetia plant are toxic to most vertebrates as they contain cardiac glycosides. Many cases of intentional and accidental poisoning of humans are known. Case reports have identified Tecojote root supplements as a source of accidental ingestion of yellow oleander.
The main toxins are the cardenolides thevetin A and thevetin B; others include peruvoside, neriifolin, thevetoxin and ruvoside. These cardenolides are not destroyed by drying or heating and are very similar to digoxin from Digitalis purpurea. They produce gastric upset and cardiotoxic effects, such as an abnormally slow heart rate, EKG abnormalities (scooped ST segments), and abnormally high levels of potassium in the blood. Antidotes include atropine and digoxin immune fabs (antibodies), and treatment may include oral administration of activated charcoal. Ovine polyclonal anti-digitoxin Fab fragment antibody (DigiTAb; Therapeutic Antibodies Inc.) can be used to treat T. peruviana poisoning, but in many countries the cost is prohibitively high.
Cultivation
[Contains information from Leaf Area Index (LAI) and Heritage Trees from data.gov.sg (National Parks Board), made available under the terms of the Singapore Open Data Licence version 1.0]
Text excerpted from the Wikipedia article Cascabela thevetia by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
