BULBS, CORMS, TUBERS, RHIZOMES 



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

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



portion of the plant seeins 

 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. (J.) FIG. 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. 

 16), and Bulbocodium (Figs. 17 

 and 18) are also known as corms. 

 It will be seen, however, that 



Fio. 13. Corms and rhizomes of Tritonia 

 (Montbretia) crocoscemiflora. (.) 



Fio. 14. Tigridia, bulb and section 

 of same. (J.) 



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



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