Hellmut R. Toelken (born 1939) is a South Australianbotanist. He retired in December 2008 from the position of senior biologist at the State Herbarium of South Australia, but remains an honorary research associate. Earlier he was with the Botanical Research Institute, Department of Agricultural Technical Services, Pretoria, S Africa.
^"Dr Hellmut Toelken". Government of South Australia Department of Environment, Water and Natural Resources. Retrieved 25 November 2017.
^Tölken, Helmut R. (1977). A revision of the genus Crassula in southern Africa. Rondebosch: Bolus Herbarium, University of Cape Town. ISBN079920207X.
^Jessop, J. P. (John Peter), 1939-; Toelken, H. R. (Hellmut Richard), 1939-; Black, J. M. (John McConnell), 1855-1951. Flora of South Australia; Flora and Fauna of South Australia Handbooks Committee; Jessop, J; Toelken, H (1986), Flora of South Australia (4th ed.), South Australian Government Printing Division, ISBN978-0-7243-4648-6{{citation}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)