Thonner's analytical key to the families of flowering plants - Thonner, Franz, 1863-; Geesink, R. (Wageningen: Pudoc Centre for Agricultural Publishing and Documentation, 1981)
Includes index
Translated and revised edition of: Anleitung zum Bestimmen der Familien der Blutenpflanzen, 2nd ed. 1917
Keywords: Phanerogams -- Identification; Plants -- Identification