ROOTS. 



Typical primary roots with their branches have already been 

 studied in connection with seedlings. Secondary roots appear 

 upon the rootstock of Johnson grass and upon the tuber of Jeru- 

 salem artichoke. 



RADISH {Raphanus sativus L.) 



In this plant, the edible portion is the thickened primary root. 

 It is either red or white and is but sparsely branched. The plant 

 is a biennial. During the first year, it is acaulescent, and the 

 , food assimilated in the leaves, is stored in the thickened root. 

 The following season, this food is contributed toward producing 

 flowers, and maturing seed. 



Sketch the three type forms of roots : — conical, fusiform, and 

 napiform, — selecting roots to represent them. 



Sketch also the fibrous roots of Ribgrass (Plantago lanceolata) 

 and the aerial roots of Trumpetcreeper (Tecoma radicans ly). 



Study the roots of the following species : — 



Burdock (Arctium Lappa). 



Ox-eye Daisy (Chrysanthemum I,eucanthemum). 



Carrot (Daucus Carota). 



Dahlia (Dahlia variabilis). 



Rue Anemone (Anemonella thalictroides). 



Early Buttercup (Ranunculus fascicularis). 



Read:—QTa.y " I^essons " pp. 34-37. 

 References : — Gray " Structural Botany " pp. 27-36. 

 Bastin " College Botany " pp. 4-8, 179-182. 



