BULBS, CORMS, TUBERS, RHIZOMES 



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

 corms, tubers, and rhizomes, there are instances in wliich 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 



Fio. 11.— Rhizomes of German Iris. (A.) Fio. 12.— Rhizomes 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. 



/f^-— ^P^' 16), and Bulbocodiuin (Figs. 17 



and 18) are also known as corms. 



/^^ "^^t^i^fiS^PV It will be seen, however, that 



Kio. 13.— Corms and rhizomes of Tritonia 

 {Monthrctia) crocosmnifiora. (J.) 



Fio. 14.— Ti^criilia, bulb and section 

 of .same, (f..) 



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



5 



