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biddy biddy (Acaena novae-zelandieae)
ODA rating: B
USDA Symbol: ACNO4
Oregon biddy biddy distribution
Other common names
bidibid, bidgee-widgee, piri-piri-bur
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biddy biddyImages courtesy of Ken French, Oregon Dept. of Agriculture.
biddy biddy
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Perennial that grows four to eight inches tall.  Biddy-biddy spreads by stolons that root at the nodes and plants form large mats where individual plants are indistinguishable. The plant stems are prostrate to erect depending on conditions.  Leaves alternate and compound, with mature plants having 5 to 11 leaflets 1/4-2/3 inches long.  Flower heads spherical, and turn into a round bur that disperses as a unit when mature. 
This plant prefers open, disturbed, well-drained sites, including stable dunes, open scrub, grassy areas, and trampled sites in coastal habitats where some summer moisture is available and frosts are infrequent. Plants thrive on poor soils and compete poorly with established vegetation.
It is believed that this plant first spread from New Zealand to other countries in contaminated shipments of wool.
Distribution in Oregon
The first record of biddy-biddy in Oregon is 1951 in Curry County.

Biological Controls
No approved biological control agent is available at this time.