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Blue Billygoat Weed

(Ageratum houstonianum, fam. Asteraceae)

Ageratum houstonianum Ageratum houstonianum Ageratum houstonianum Ageratum houstonianum Ageratum houstonianum
Erect or semi-prostrate annual or short-lived perennial herb 0.3-1m.  Stems and leaves softly hairy with a characteristic odour when crushed.
Form or habit: Herb
Latex:Absent
Leaf:Simple Alternate

Opposite at base, later alternate, triangular shaped with heart-shaped to square base, regular rounded teeth along margin.

Flower conspicuous: Conspicuous
Flower colour: Blue-mauve
Flower description:Small fluffy heads; borne in terminal clusters
Fruit conspicuous: Conspicuous
Fruit colour: Brown
Fruit: Dry
Fruit description: 'Seeds' black, about 2mm long, tipped by a ring of chaff-like scales.
Habitat:
Distribution:
Food source for:
Toxicity:Toxic or irritant to domestic pets
Origin:Asia
Weed:Yes
Weed status:Environmental/garden escapee
Notes:Spread by: Wind, water.

Invades/threats: Weeds of disturbed areas. Cause harvesting difficulties in cane crops.

A. conyzoides is the more common species in this region then A. houstonianum which has seldom been recorded.
Information sources: Mackay Regional Pest Management Group (2011) Weeds of the Mackay Whitsunday Region.

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