TRILLIUM SP. 157 



seed may "germinate" and produce a new Trillium 

 plant. 



The root-stock is a storage region for surplus foods 

 and is a device for tiding over unfavorable seasons by 

 retreating underground. 



In the aerial stem a notable feature is the arrangement 

 and structure of the vascular bundles. While they 

 are not so well developed as in some other Monocotyledons 

 (grasses, corn, oats, etc.), they show an indefinite distri- 

 bution, and the closed bundle is typical of the group. 

 Few Monocotyledons increase in thickness by cambial 

 activity, as do the pines. When such a cambium is formed, 

 it does not increase the radial dimensions of the xylem 

 and phloem already formed, but gives rise by tangential 

 division to tissues which become new, isolated bundles 

 and parenchymatous ground tissue between them. 



