A GUIDE AND KEY TO AQUATIC PLANTS 



33 



23. Leaves 4-6 in whorls, blades very narrow; Sclerolepis, p. 139. 



flowers conspicuous, purple (fig. 21) 

 23. Leaves usually 3 in whorls (sometimes 4) ; Anacharis, p. 75. 



flowers minute and inconspicuous (fig. 22). 



Figure 21. 



Figure 22. 



24. Leaves borne separately along stem; flowers incon- 25. 



spicuous. 

 24. Leaves crowded on stem; flowers 3-petaled, pink and Mayaca, p. 104. 

 fairly conspicuous (fig. 23). 



25. Leaf-base apparently inflated (fig. 24) Ruppia, p. 71. 



25. Leaf-base narrow, sometimes with stipules Potamogeton, p. 69. 

 (fig. 25). 



Figure 23. 



Figure 24. 



Figure 25. 



