Western Australia, Emex australis, Polygonaceae
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There is no more trouble some weed in Western Australia than doublegee. Beside its competitive and smothering effect on crop and pasture, the spiny fruits penetrate the hoofs of stock causing lameness. It is a quick growing annual which soon produces a strong taproot and forms seeds at an early stage of growth. Dormant seed will continue to germinate for a number of years and a succession of germination often occur in one season. The seedlings are capable of surviving adverse conditions and making rapid recovery.
Meadly, G.R W.
"Weeds of Western Australia - Doublegee (Emex australis Steinh),"
Journal of the Department of Agriculture, Western Australia, Series 3: Vol. 4
, Article 11.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture3/vol4/iss3/11