Johann Freiderich Carl Wilhelmi (1829–1884) was a Dresden born seedsman who made large collections of botanical specimens in southern Australia.
Wilhelmi was one of a number of influential German-speaking residents — such as Ludwig Becker, Hermann Beckler, William Blandowski, Amalie Dietrich, Wilhelm Haacke, Diedrich Henne, Gerard Krefft, Johann Luehmann, Johann Menge, Carl Mücke (a.k.a.
[3] Wilhelmi's material was mainly collected at the River Murray's lower reaches, at Eyre Peninsula, and in the south-east of South Australia.
[2] Wilhemi also published a report of cultural practices and foods of Indigenous Australians at Port Lincoln.
[4] A plant he collected at the same location was described by Ferdinand von Mueller and his name was commemorated in the specific epithet of what is currently described as Homoranthus wilhelmii.