22 



BOTANY FOR BEGINNERS 



CHAP. 



differ from roots in producing leaves and buds. Solomon's Seal 

 and the Iris produce rhizomes (Fig. 18). 



The Tuber is a swollen underground stem, and in it there is 

 stored up large quantities of reserve materials for the production 



* I c d 



FIG. 18. Rhizome of Solomon's Seal. a = bud of next year's aerial growth 

 b = scar of this year's growth ; c, d, e, scars of previous year's aerial growth 



and iu = roots. 



FIG. IQ. Part of Potato plant, with the old dark tuber in the centre. 

 (One-third natural size.) 



of a new plant. The Potato tubers are produced from the ends 

 of stolons, and thus are formed a little distance from the parent 



