Von Ludwig, C. F. H. “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, no. 5 (October 1, 1831): 40–45. Accessed January 15, 2026. https://journal.ru.ac.za/index.php/saqj/article/view/2598.