ROOTS 



127 



FIG. 72. Modified roots. 1, Aerial roots of tropical orchid; 2, enlarged storage 

 part of the roots of ground-nut (Glycine apios) ; 3, water roots of water hyacinth 

 (Piaropus crassipes); 4, parasitic roots of dodder (Cuscuta gronovii); 5, nitrogen 

 bacteria nodules on the roots of New Jersey tea (Ceanothus americanus) ; 6, Virginia 

 creeper (Parthenocissus quinquefolid) . 



