482 



A TEXT-BOOK OF BOTANY. 



FIG. 265. Pickerel vv eeu (Pontederia cordata), a common aquatic herb growing along 

 the margin of slow streams. It is a very hardy plant occurring far north and grows best in 

 water ten or twelve inches deep. It produces long-petioled leaves and a single stem bearing 

 a spike of violet-blue, ephemeral flowers. After Troth. 



