COBBLER’S PEGS (WEED)
Bidens alba var. radiata, Bidens pilosa, Fam. Asteraceae
Erect annual herbs to 0.6m, mostly hairless green to purplish stems, square in cross section.
|Form or habit:||Herb|
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 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 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’.|
|Food source for:|
|Origin:||Cosmopolitan in warm areas|
|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. Environmental weed.|
|Information sources:||Mackay Regional Pest Management Group (2011) Weeds of the Mackay Whitsunday Region.|