BULBS, CORMS, TUBERS, RHIZOMES 



While it is easy in many cases to distinguish the true bulbs, 

 eorms, tubers, and rhizomes, there are instances in which the swollen 



portion of the plant seems 

 to be intermediate between 

 one or the other. The root- 

 stock of the Tigridias or Tiger 

 Flowers, for example, is called 

 a "corm," but a reference to 



Fig. 11.— Bhizomes of German Iris. (J.) Fio. 12.— EMzomes of Solomon's Seal. (J.) 



Fig. 14 shows that it is more like an ordinary tunicated bulb. 



The root-stocks of Erythro- 

 nium (Fig. 15), Colchicum (Fig. 

 16), and Bulbocodium (Figs. 17 

 and 18) are also known as corms. 

 It will be seen, however, that 



Via. 13.— Corms and rhizomes of TrUimia Fio. 14. — Tigri^ia, balb and section 



(MovibreHa) crocosmndjiora. (J.) ofs^e. (J.) 



the vegetation of these plants is not like that of the Crocus or 



5 



