84 



Principles of Plant Culture. 



season. In the so-called evergreen plants, in which the 

 leaves are usually very thick and are often well protected 

 ■against evaporation by a very strongly developed cuticle 

 (65), the leaves rarely live more than a few years. 



127. The Manurial Value of Leaves, that mature on the 

 plant, is usually small, since the more valuable fertilizing 

 materials they contain pass into the stem before the 

 leaves ripen (171). The mineral matters contained in 

 largest quantity by leaves are those that are not used by 

 the plant, but ha~ve been deposited within them during 

 transpiration (126). 



Section IX. The Buds 



128. The Buds. Bach tip of the stem (67) is in most 

 plants protected with a covering of rudimentary leaves 



or leaf-scales, and the tip with its leafy or 

 scaly covering constitutes a hud. A bud 

 forming the apex of a shoot is called a ter- 

 minal bud; one at the junction of a leaf with 

 the stem (axil) is called an axillary or lateral 

 bud (Fig. .35). 

 ^ Each bud generally includes one terminal- 

 ^^^ and several axillary growing points. Aside 

 (f from these, which in the stem exist 

 only in the bud, a bud is simply a part of 

 the stem in which the leaves and internodes 

 Fig. 37^ Buds. ^^^ ^^ ^^® cmbryo Stage. 

 L, lateral buds. In most perennial plants, the rudimen- 



■( After Barry). , , jt , /. 



tary leaves that form near the terminus of 

 the young shoots at the latter end of the growing season 

 are changed into hud-scales, which serve to protect the 

 growing points within from excessive moisture and sud- 



