Biosystematische Untersuchungen in der Familie der Wasserlinsen (Lemnaceae) Landolt, Elias 1926- text Zürich Institut ETH c1980-1987 monographic 4 v. : ill. ; 23 cm. v. 1. Key to determination. Cytological variation. Amino acid composition and sugar content. Effects of nitrogen and phosphorus. Bibliography. List of studied material -- v. 2. The family of Lemnaceae, a monograph study, v. 1 -- v. 3. Biosystemic investigations in the family of duckweeds (Lemnaceae) -- v. 4. The family of Lemnaceae, a monographic study, v. 2. edited by E. Landolt. Includes bibliographies. Duckweeds Classification QK495.L527 B56 584/.64 81158858 UOEL 000 20150310154208.0 433057