a. Amaranthus palmeri, Tumamoc Hill, August 10, 1909. 

 b Anoda thurberi, Tumamoc Hill, August 10, lOOO. 



c. Aster tanacetifolius, Tumamoc Hill, August 26, 1909. 



d. Aster tanacetifolius showing, at left, root-formation at base of lateral of 

 first order. The figure at right has segment of tap-root bearing lateral of first 

 order with its branches. 



