Western Australia, Oxalis pes-caprae, Weeds.
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During winter and spring, the yellow colouration of paddocks is not always due to the lowers of the widely distributed Capeweed. In some districts, particularly in the Avon Valley, the yellow-flower soursob (Oxalis pes-caprae L.), has become firmly established. The genus Oxalis contains 800 or more different species, the two main natural centres of distribution being South Africa and tropical and extra-tropical South America.
Meadly, G. R. W.
"Weeds of Western Australia - Soursob (Oxalis pes-caprae L.),"
Journal of the Department of Agriculture, Western Australia, Series 3: Vol. 4
, Article 8.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture3/vol4/iss4/8