These two species are easily confused. Best way to separate is to take a close up photo of the base of the corolla tube. If slit to near base then Lobelia pedunculata, if not the Isotoma fluviatilis.
https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=fm&name=Campanulaceae
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