FIELD BOOK OF PONDS AND STREAMS 



species differ from this one in shape of leaves and depth of 

 the pink and rose flower color. 



Occurrence. — Found locally in shallow calcareous water of 

 ponds, usually over sandy, but sometimes mucky bottoms. 

 Height, 3-6 inches. Blooms July-August. Generally dis- 

 tributed through northern states, southward to New Jersey, 

 Kentucky ; rare near the Atlantic coast. 



Homworts — Ceratophyllacece 



Hornwort, Ceratophyllum demersum. — Like Myriophyllum 

 (p. 99), which it resembles, Ceratophyllum (Fig. 74) grows 

 submerged in ponds usually well out from shore. Its narrow 



Fig. 74. — Hornwort, Ceratophyllum demersum. 



thrice-forked leaves are borne in whorls on floating branches 

 a foot or two long and true roots are absent. The seeds germi- 

 nate on the bottom but when the young plants are about 



90 



