Berlin,D. Reimer (E. Vohsen)1912. | New York Botanical Garden, LuEsther T. Mertz Library

German article in Die Gartenlaube, 1875, no. 2

German article in Die Gartenlaube, 1871, no. 3

German article in Die Gartenlaube, 1884, no. 38

German article in Die Gartenlaube, 1885, no. 40

London :G. Philip & Son,1888. | Field Museum of Natural History Library

Berolini: G. Reimer, 1862.