This project is supported by The Central Qld Coast Landcare Network through funding from the Australian Government's Caring for our Country

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COBBLER’S PEGS

(Bidens alba var. radiata, Bidens pilosa, fam. Asteraceae )

Bidens alba var. radiata, Bidens pilosa Bidens alba var. radiata, Bidens pilosa Bidens alba var. radiata, Bidens pilosa Bidens alba var. radiata, Bidens pilosa Bidens alba var. radiata, Bidens pilosa

Erect annual herbs to 0.6m, mostly hairless green to purplish stems, square in cross section.

Form or habit: Herb
Latex:Absent
Leaf:Compound Opposite

Opposite with serrated margins, lower leaves usually simple, ovate, 15-70 x 5-35mm, middle leaves usually pinnate with 3-7 leaflets, upper leaves smaller, often single or with 3 leaflets.

Flower conspicuous: Conspicuous
Flower colour: White petals and yellow centres
Flower description:B. alba var. radiata has yellow fluffy heads surrounded by white ‘petals’, up to 12mm in diameter; B. pilosa lacks the white ‘petals’; both have heads borne in terminal sprays.
Fruit conspicuous: Conspicuous
Fruit colour: Black
Fruit: Dry
Fruit description: ‘Seeds’ clustered on each flower head, black, up to 15mm long, flattened and 4-angled ending in 2-3 yellowish barbed bristles – the ‘cobblers pegs’.
Habitat:
Distribution:
Food source for:
Toxicity:
Origin:Cosmopolitan in warm areas
Weed:Yes
Weed status:Environmental/garden escapee
Notes:Spread by: ‘Seeds’ attach to ‘everything’ including clothing and fur.
Invades/threats: Minor weed in cane fields, common to abundant in disturbed areas such as roadsides, banks and fallow land; gardens.
Notes: Both are widely naturalised, but B. alba var. radiata is the more common species this region.
Information sources: Mackay Regional Pest Management Group (2011) Weeds of the Mackay Whitsunday Region.

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