A GUIDE AND KEY TO AQUATIC PLANTS 



63 



71. Flowers blue, violet, or purple 72. 



71. Flowers various but not blue or violet; petals some- 74. 

 times wanting. 



72. Sepals united at base into a tube enclosing 73. 

 the ovary and later the fruit; leaves with- 

 out spines in axils. 

 72. Sepals free to base and not including the Hydrolea, p. 134. 

 ovary; leaves, or some of them, often with 

 spines in axils (fig. 64). 



73. Sepals longer than the calyx tube, reflexed (fig. 65) Campanula, p. 138. 



73. Sepals much shorter than the calyx tube, not reflexed Lythrum, p. 126. 

 (fig. 44). 



Figure 64. 



74, Flowers regular; petals, if present, yellow 75. 



74. Flowers irregular; white, orange, or yellow 76. 

 in color. 

 75. Capsule or calyx tube short and stout, less than 1.5 cm. Ludwigia, p. 126. 



long; stamens 4 (fig. 66) . 

 75. Capsule or calyx tube long and slender, over 1.5 cm. Jussiaea, p. 128. 

 long; stamens 8 (fig. 67). 



Figure 66. 



Figure 67. 



