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Central QLD Coast Landcare Network

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Yellow oleander, Captain Cook tree

Cascabela thevetia, Fam. Apocynaceae


Usually much-branched shrub to 4m but, sometimes a tree to 10m, milky sap. Previously Thevetia preruviana.

Weed Category: Restricted invasive plants Category 3
Plants declared invasive under the Biosecurity Act 2014, that are present in QLD. Not to be distributed or disposed of.
Weed: Yes
Form or habit: Shrub, Small tree
Family: Apocynaceae
Leaf: Simple Alternate
Alternate, linear, simple densely spiralled, dark glossy green above, narrow, pointed at tip, 93-150 x 4-15mm.
Flower conspicuous: Conspicuous
Flower colour:

Yellow

Flower description: Yellow or peach, bell-shaped with 5 overlapping lobes, waxy, up to 50mm in diameter, scented, borne in several flowered clusters.
Fruit conspicuous: Conspicuous
Fruit colour:

Black, Green

Fruit: Fleshy
Fruit description: Lantern shaped, laterally compressed, fleshy drupes, 25-40mm in diameter, green ripening to black, with 4 seeds enclosed within 2 bony structures.
Habitat:
Distribution
Food source for:
Toxicity: Toxic if ingested, potential allergen, irritant sap, toxic or irritant to domestic pets, toxic to native animals.
Origin: Tropical America
Notes: Spread by: water, feral pigs, garden waste, gravity. Invades: bushland, creek banks and pastures. Notes: introduced as garden ornamental, all parts deadly poisonous, particularly the seeds.
Information sources: Mackay Regional Pest Management Group (2018) Weeds of the Mackay Whitsunday Region Second Edition.

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