20 



B 



Figure 6. 

 Lemna trisulca: A. habit x '/iz. B. habit of parent frond 

 with lateral fronds remaining attached ^ 2. 

 Lemna valdiviana: C. habit x 5. 

 Lemna perpusilla: D. habit x 5. 

 Lemna minor: E. habit x 5. F. staminate flowers x 15. 



