A GUIDE AND KEY TO AQUATIC PLANTS 



35 



32. Leaves small, mostly less than 15 cm. long, heart- Nymphoides, p. 134. 

 shaped; flowers white and less than 2.5 cm. across 

 (fig. 31). 

 32. Leaves large, mostly more than 15 cm. long; flowers 33. 

 white or yellow, more than 5 cm. across. 



33. Flowers white; leaf-blade round (fig. 32) Nymphaea, p. 117. 



33. Flowers yellow; leaf-blade longer than wide, Nuphar, p. 116. 

 or approaching an orbicular shape (fig. 33). 



Figure 31. 



Figure 32. 



Figure 33. 



34. Leaves round, often peltate; the long petiole attached Hydrocotyle, p. 130. 



near center of leaf (fig. 34) . 



34. Leaves usually longer than broad ; petiole, if present, 35. 

 not attached at center of leaf. 



35. Leaves broadened and often clasping at the 36. 

 base. 



35. Leaves narrowed at the base 38. 



36. Plants aromatic when crushed; flowers blue (fig. 35) __ Hydrotrida, p. 135. 



36. Plants not aromatic when crushed; flowers white 37. 



Figure 35. 



