A TEXT-BOOK OF BOTANY 



Fig 26s Pickerel Weed {Pontederia cordata), a common aquatic herb growing along 

 the margin of' slow slreams. It is a very hardy plant occurring far north and grows best m 

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

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



