Illustrations of the British Flora (1924)

An Illustrated Flora Of The Northern United States, Canada And The British Possessions, Nathaniel Lord Britton, Addison Brown (1913)

Pflanzenleben des Schwarzwaldes, Friedrich Oltmanns (1927)

Sudetenflora, W. Winkler (1900)

© 2001-2011 Klaas Dijkstra