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Also see:
Department of Agriculture and Food Western Australia (undated) Variegated Thistle (Silybum marianum). Declared plant in Western Australia. Available at h.
Department of Primary Industries and Water Tasmania (2002) Variegated Thistle (Silybum marianum L.) Control Guide. Available at http://www.dpiw.tas.gov.au/inter.nsf/WebPages/RPIO-4ZZ8U4?open .