128 



ROOTS 



4. Roots store food. The parenchymatic cells of most 

 roots function as storage cells for the excess food manufac- 



8 



9 



FIG. 73. Surface of Roots and Rhizomes. 1, Furrowed Mexican sarsa- 

 parilla (Smilax medico) ; 2, wrinkled butterfly weed (Asclepias tuberosa) ; 3, 

 fissured Cartagena ipecac (Cephoelis acuminata) ; 4, sunken Jalap (Exo- 

 gonium purga) ; 5, split berberis (Species of odostemon) ; 6, keeled senega 

 (Polygala senega) ; 7, Annulate gentian (Gentiana luted) ; 8, nodulated ger- 

 anium (Geranium maculatum) ; 9, abraded belladonna root (Atropa Bella- 

 donna) . 



