Common name: Yellow oleander
Botanical name: Cascabela thevetia (also known as Thevetia peruviana or Thevetia neriifolia)
Other common names: Cook tree, Be-still tree, Lucky nut, Dicky plant
General description: A large spreading shrub usually 2.5–3.5m tall.
Flowers: The sweetly perfumed flowers are funnel-shaped, bright yellow or peach coloured, 5.5–7cm long and 2.5–4cm wide, grouped in clusters at the end of the branches.
Leaves: The leaves are glossy green, strap-like, alternating on the stem, 5.5–15cm long and 0.5–1.5cm wide.
Fruit/Berries: The fruit are angular, green when immature, ripening black, broader than long and somewhat triangular in outline, with a raised ridge around the middle, about 3–4.5cm in diameter. The fruit is fleshy and soft like a plum and encloses a “stone” comprising two starchy kernels.
Other: The sap is milky. Cascabela thevetia is a restricted (category 3) species under Queensland’s Biosecurity Act 2014.
Symptoms: All parts of the plant are toxic if eaten, particularly the fruit and seeds. This species has been responsible for the deaths of several children. Symptoms may include a burning sensation in the mouth, vomiting, diarrhoea, dizziness and a slow or irregular heartbeat. The sap may be an irritant and cause dermatitis or blistering.
Toxicity category: 1, 3
Warning: Seek urgent medical assistance for all ingestions.