This herbarium would become the basis for the Flora Capensis (1860–1865) by his friend, Hamburg botanist Otto Wilhelm Sonder (1812–1881) in collaboration with the British botanist William Henry Harvey (1811–1866).
The herbarium would form the basis for the Flora Capensis (1860–1865) by Otto Wilhelm Sonder, a friend and Hamburg botanist (1812–1881), working alongside William Henry Harvey, a British botanist (1811–1866).