This taxon name is current. The available references for this name are:
Microstemma R.Br. is a taxonomic synonym.
Reason See D.J. Mabberley in Mabberley's Plant Book Ed.3:546(2008)
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A taxon name that is no longer current will retain its ‘Threatened’, ‘Extinct’, or ‘Extinct in the Wild’ status until a new name has been published in a Biodiversity Conservation Order.