Sonchus oleraceusCommon name: Common Sowthistle
Distribution: Widespread from Wittenoom to the Nullarbor Plain.
Description: An erect annual with hollow stems to 1.5 metres tall. The stems produce white latex when cut. The yellow flowers are produced from June to December.
Notes: Native to Eurasia and North Africa.
References: Western Weeds, A Guide to the Weeds of Western Australia. BMJ Hussey, GJ Keighery, J Dodd, SG Lloyd, RD Cousens. 1997.
Flora of the Perth Region. NG Marchant, JR Wheeler, BL Rye, EM Bennett, NS Lander, TD Macfarlane. 1987