106 



OBJECT LESSONS IN BOTANY. 



Spiraea. If little tubers here and there are attached to the 

 fibres, the root is tubercular, as in Squirrel-corn. 



fig. 3:38. Fibro-tuberous root of Peony. 



Fig. 339. Fibro-tuberous root of Spiraea filipundula. 



Fig. 840. Fibro-tuberous root ef Mourning Geranium. 



223. All these fleshy forms, whether tuberous or fibro-tu- 

 berous, are filled with starch, deposited there in store, for use 

 in the future growth of the plant. Many other forms of roots 

 are described in larger works. 



LESSON XXVIII. 



OF THE STEM OR ASCENDING AXIS. 



224. THK stem tending upward in its growth is often called 

 the ascending axis. It does not in all cases continue to arise 



223. What purpose do fleshy roots serve ? 



Unas. XXVITI. What is the subject of this lesson? 



