Isotoma armstrongii E.Wimm. legitimate = Lobelia douglasiana F.M.Bailey
Isotoma armstrongii E.Wimm. auct. non E.Wimm.: sensu Wiecek, B. in Harden, G.J. (ed.) (1992), Lobeliaceae. Flora of New South Wales 3: 130 = Lobelia stenophylla Benth.