126 



AGMXXOMY 



FIG. 90. Tree yuccas, xerophytic plants of the Mohave Desert 



the trunks of trees, rocks, and in similar places are examples 

 of such plants. Hydrophytes are water plants and thrive only 

 in regions of abundant rainfall. The water lily, pickerel weed, 

 ditch moss, and pondweed are good illustrations. They are 



FIG. 91. The American lotus (Nelumbo), a hydrophyte 



