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Central QLD Coast Landcare Network

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Thickhead

Crassocephalum crepidioides, Fam. Asteraceae


Erect, annual herb to 1m with a ribbed stem.

Weed Category: Other invasive plants
Invasive plants that are not prohibited or restricted invasive plants, but are known to spread readily and cause negative impacts, within the region.
Weed: Yes
Form or habit: Herb
Family: Asteraceae
Leaf: Simple Alternate
Simple, alternate with coarsely toothed margins, elliptic to ovate in outline, up to 200 x 100mm with stalks to 40mm long; upper leaves smaller, usually elliptical; lower leaves larger with a pair of lobes close to base.
Flower conspicuous: Conspicuous
Flower colour:

Pink, Orange

Flower description: Orange to orange-pink, fluffy heads borne on slender stems in drooping groups, becoming erect as ‘seeds’ develop.
Fruit conspicuous: Inconspicuous
Fruit colour:

Brown

Fruit:
Fruit description: Numerous small brown ribbed ‘seeds’, each with many fine hairs attached to the top.
Habitat:
Distribution
Food source for:
Toxicity: No toxicity known
Origin: Africa and Madagascar
Notes: Spread by: seeds by wind and water; contact with the ground results in pieces of stem taking root. Invades/threats: roadsides and disturbed areas. Environmental weed.
Information sources: Mackay Regional Pest Management Group (2018) Weeds of the Mackay Whitsunday Region Second Edition.

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