Letter from A. Hansen 2 July 1982. Obit. in Bothalia 38(1): 111-113. 2008, incl. portr. & bibliogr.. Email message on the dates and 2008 reference from Stefan Dressler (FR).
Example of Name Published
Haworthia lockwoodii Archibald in Fl. Pl. South Africa, 20:. t. 792. (1940)