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, Cape Colony, v. 1, n. 5, p. 40–45, 1831. DOI: 10.21504/saqj.15.2598. Disponível em: https://journal.ru.ac.za/index.php/saqj/article/view/2598. Acesso em: 15 jan. 2026.