Further reference:
http://keyserver.lucidcentral.org/weeds/data/media/Html/alternanthera_pungens.htm
Alternanthera pungens is listed in the following regions:
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Australian National University Commonwealth & Kings Parks Hughes Garran Woodland Lake Burley Griffin West Lyneham Wetland Mount Ainslie to Black Mountain Red Hill to Yarralumla Creek Sullivans Creek, Acton Sullivans Creek, Lyneham South Tuggeranong Hill Uriarra Recreation Reserve Watson Woodlands