Von Ludwig, C.F.H. 1831. List of exotic trees, shrubs, plants, bulbs; garden flower, forest, and other seeds: imported lately from Germany (Wurtemberg and Hamburg), Holland, &c. by the Danish Ship Norden, Capt. Burd, and the Ionia, Capt. C. Buck. South African Quarterly Journal. 1, 5 (Oct. 1831), 40–45. DOI:https://doi.org/10.21504/saqj.15.2598.