Among his many contributions to taxonomy are his treatments of the Medusagynaceae, Theaceae, Violaceae, and Canellaceae for the second edition of the Die Natürlichen Pflanzenfamilien of Engler & K. Prantl, the publication as editor with E. Werdermann, of ed.
There used to be forests of Mountain Mahogany trees until a hurricane in the 1960s destroyed many of the trees, which are Freziera undulata in the family Theaceae.
Theaceae |
His main interest was in the Violaceae, Theaceae, and Bignoniaceae and, especially in his earlier years, in the flora of the Alps.
The circumscription of the family is variable, with some systems describing the family as consisting solely of the genus Sladenia, which has been variously considered a member of the Theaceae, the Actinidiaceae, the Dilleniaceae, or the Ternstroemiaceae.