Pale smartweed(Persicaria lapathifolia), also known as Pale Knotweed. The plant erect to ascending, 50–180 cm high, usually glabrous; sometimes rooting at nodes, often reddish, often with scattered sessile glands.
Learn more at: https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Persicaria~lapathifolia
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