TRILLIUM RECUR VA TUM. 201 



ii. The two areas in each : the light colored por- 

 tion lying toward the outside of the stem, the 

 phloem, the shaded portion lying toward the 

 center of the stem, the xylcm. 



4. Draw the section. 



5. Make a longitudinal section and note the several parts 

 seen in the transverse section. Draw. 



E. THE LEAF. Note 



1. The scale leaves of the rootstock. 



a. The bases of decayed scales at each node. 



b. Younger ones, sheathing the apex of the rootstock 

 and base of the aerial branch. 



Mount a portion of a scale and notice 



c. The parallel veins, and intervening parenchyma. 



d. Numerous dark spots, clusters of raphides. 



2. The foliage leaves of the aerial stem. 



a. The number and arrangement. 



b. The shape. 



c. The particular outline of the apex, and of the 

 base. 



d. The short stalk, petiole, if present. 



e. The distribution of the reins. 



Mount a transverse section from near the base of the leaf, 

 and note 



/. The several parts : 



The colorless epidermis. 



The reins, the largest projecting on the lower 

 side ; each containing 



iii. A fibro-vascular bundle, having the phloem 

 area toward the under side of the leaf ; accom- 

 panied in the largest veins by 



