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PUBLIC HEALTH BULLETIN NO. 2 86 



9. Submerged leaves whorled, stems usually very lax Myriophyllum, p. 129. 

 (fig. 6). ^ 



9. Submerged leaves scattered, stems not so lax 10. 



10. Submerged leaves with simple divisions Proserpinaca, p. 129. 



(fig. 7). 

 10. Submerged leaves with leaflets again divided Neobeckia, p. 119. 

 (fig. 8). 



L^^^^ 



^/. 



Figure 6. 



Figure 7. 



Figure 8. 



11. Submerged leaves alternate or irregularly borne Ranuneulus, p. 118. 



(fig. 9). 

 11. Submerged leaves borne opposite each other on stem 12. 

 or whorjed. 



12. Submerged leaves opposite; leaflets not Cabomba, p. 117. 



toothed (fig. 10). 

 12. Submerged leaves whorled; leaflets minutely Ceratophyllum, p. 116. 

 toothed on one edge (fig. 11). 



