Peter R. O. Bally

• Heil- und Giftpflanzen der Eingeborenen von Tanganyika
• Lithocaulon Bally (Asclepiadaceae), a new genus from Somaliland
• Miscellaneous notes on the flora of Tropical East Africa including description of new taxa, 34
• New species of succulent Euphorbia from tropical East Africa
• Notes on the section Loligo in the genus Ceropegia, with a description of a new variety of Ceropegia de-vecchii Chiov
• Some new species, varieties and forms of Monadenium (Euphorbiaceae)
• The genus Monadenium