The Landolt Duckweed Collection contains samples of every known species of duckweed in the world. The purpose oft the collection is to preserve these species in order to provide living samples available for research and also to provide a forum for the exchange of information. The study of duckweed is important. In a world of increasingly scarce resources we continually discover many new useful applications. Duckweed  is as a source of animal feed, a means of purifying polluted water and it can also be used in the generation of renewable forms of energy.

Further research is needed in order more fully to classify the various species of duckweed. It is hoped that such research will lead to a better understanding of the duckweed family together with its relevance for environmental issues.

We aim to support work in this particular field of study, by means of modest financial grants.


The Landolt Duckweed Collection is named after Professor Dr. Elias Landolt who was born in Zürich in 1926. He read Natural Sciences at the Swiss Federal Institute of Technology (SFIT). He was awarded a PhD in 1953, after which he studied at Stanford University in California where he began his life-long research into the various species of duckweed. He returned to Switzerland in 1955 and finished his postdoctoral thesis “Physiologische und ökologische Untersuchungen an Lemnaceen” in 1957. In 1964 he became an Associate Professor, and in 1967 the Full Professor, at SFIT. He was the director of the Geobotanical Institute at SFIT from 1975 until he retired in 1993. He continued his research until his death in 2013. Many scientific publications make reference to his research.