Hester Susanna Joubert, daughter of Gideon Jacobus Joubert and his wife Hester Johanna, born De Villiers, is the first known South African born woman to collect plants at the Cape. She collected mainly on the farm Zoetendalsvlei (now Soetendalsvlei), some 20 km south of Bredasdorp. Her specimens were given to C.F. Ecklon*, and some possibly to J.L.L. Mund*. Several plant species were named after her: Hermannia joubertiana (by W.H. Harvey*), Agathosma joubertiana, Aspalathus joubertiana, and Hartogia joubertiana.
Hester's brother, Advocate Josua Andries Joubert, owned the estate "Nooitgedacht" near Cape Town and allocated a portion of it to Ecklon to cultivate bulbous plants. On 4 December 1829 Hester married Gysbert Jan Carel Reitz of Cape Town (widower of Geesje Wilhelmina Karnspek, who died in 1829). He died in 1859.