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), 40-45. https://doi.org/10.21504/saqj.15.2598