This taxon name is not current. The available references for this name are:
Lobelia quadrangularis R.Br. has been misapplied against the current name Lobelia arnhemiaca E.Wimm.
Reason Fide D. Albrecht in litt. June 2010
See also: A longer explanation of these and other terms in our Plant Names Primer.
A taxon name that is no longer current will retain its ‘Threatened’, ‘Extinct’, or ‘Extinct in the Wild’ status until a new name has been published in a Biodiversity Conservation Order.