This taxon name is current. The available references for this name are:
Chenopodium benthamii Iamonico & Mosyakin subsp. benthamii is a nomenclatural synonym.
Reason Fide K.A. Shepherd in litt. (31/08/2017)
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A taxon name that is no longer current will retain its ‘Threatened’, ‘Extinct’, or ‘Extinct in the Wild’ status until a new name has been published in a Biodiversity Conservation Order.