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Oxalis purpurea
Bright pink winter flowers about 20mm across.
Public parkland surrounded by dense eucalyptus forest.
Common. Introduced to Australia. Naturalised. Cosmopolitan, but centres of diversity in South Africa and South America. Cultivated as an ornamental. An invasive weed here... http://www.weeds.org.au/cgi-bin/weediden...
Some oxalis species, for sure
http://www.weeds.org.au/cgi-bin/weediden...