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PUBLIC HEALTH BULLETIN NO. 286 



11. 

 11. 



13. 

 13. 



15. 



15. 



10. Stems 4-angled Eleocharis, p. 88. 



10. Stems 3-angled 11, 



Stems long {% meter or more) Scirpus, p. 91. 



St^ms shorter Eleocharis, p. 88. 



12. Leaves all basal or from one pojnt 13. 



12. Leaves distributed along stem 24. 



Leaves round 14. 



Leaves flattened 15. 



14. Leaves from enlarged, spore-containing bases Isoetes, p. 68. 



(fig. 8). 

 14. Leaves (in reality stems) not from enlarged, Eleocharis, p. 88. 

 spore-bearing bases; bases with a tubular 

 sheath (fig. 6). 

 Plants small, mostly under 1 dm. tall; leaves filiform, Myosurus, p. 118. 



or very narrowly linear (fig. 9). 

 Plants mostly over 1 dm. tall; leaves more broadly 16. 

 linear. 



Figure 8. 



FlQDRE 9. 



