11. Monocotyledons-] LXXVII. LEMNACE^E, 



946. Lemna trisulca, L. 



Ivy-leaved Duckiveed. 



237 



947. Lemna minor, L. 



Lesser Duckweed. 



Lemna gibba, L. 



Gibbous Duckweed. 



949. Lemna polyrrhiza, L. 



Greater Duckiveed. 





'-c^-oo 3:;ca 



950. Lemna arrhiza, L. 

 Wolffiaar., Wim., Michelii, Schl. 



Rootless Ducliweed. 



LXXVIIL NAIADE/E. 



95 r. Zostera marina, L. 



