This is a translation of 'Biologie der Wassergewaechse (1886) into English by Donald H. Les. -From the 'Die Biologie der Wassergewaechse' is an essential reference for students in the field of aquatic plant biology because it presents an insightful review of major research conducted during the 19th century, a period of intensive botanical investigation. Today, with a shift in emphasis to molecular and other laboratory based scientific research, basic studies of aquatic plant natural history have waned and this area is still best represented in the older literature. 'Die Biologie der Wassergewaechse' contains invaluable knowledge on this topic.- The added appendix offers an index of scientific names of plants and current nomenclature.