 In Adolf Engler's treatise "Das Pflanzenreich" ("The Plant Kingdom"), he was author of the chapter on Lythraceae.He also made important contributions involving Lythraceae to Engler and Karl Prantl's "Die Natürlichen Pflanzenfamilien" ("The Natural Plant Families"), as well as to Karl Friedrich Philipp von Martius' "Flora Brasiliensis".Another noted written effort by Koehne was the 1893 "Deutsche Dendrologie" ("German Dendrology").