SECTION 4] 



31 



the upper supernumerary bud is a good way out of the axil and above the 



others. Arid this is here stronger than the others, and grows into a 



branch which is considerably out of the axil, while the lower and smaller 



ones commonly do not grow at all. In other cases 



three buds stand side by side in the axil, as in the 



Hawthorn, and the Red Maple (Fig. 79.) If these 



were all to grow into branches, they would stifle each 



other. But some of them are commonly flower-buds : 



in the Red Maple, only the middle one is a leaf-bud, 



and it does not grow until after those on each side of 



it have expanded the blossoms they contain. 



60. Sorts of Buds. It may be useful to enumerate 

 the kinds of buds which have been described or men- 

 tioned. They are 



Terminal, when they occupy the summit of (or ter- 

 minate) a stem, 



Lateral, when they are borne on the side of a stem ; 

 of which the regular kind is the 



Axillary, situated in the axil of a leaf. These are 



Accessory or Supernumerary, when they are in 

 addition to the normal solitary bud; and these are 

 Collateral, when side by side ; Superposed, when one 

 above another; 



Extra-axillary, when they appear above the axil, as 

 some do when superposed, and as occasionally is the 

 case when single. 



Naked buds ; those which have no protecting scales. 



Scaly buds ; those which have protecting scales, 

 which are altered leaves or bases of leaves. 



Leaf-buds, contain or give rise to leaves, and develop into a leafy shoot. 



Flower-buds, contain or consist of blossoms, and no leaves. 



Mixed buds, contain both leaves and blossoms. 



61. Definite annual Growth from winter buds is marked in most of 

 the shoots from strong buds, such as those of the Horse-chestnut and 

 Hickory (Fig. 72, 73). Such a bud generally contains, already formed in 

 miniature, all or a great part of the leaves and joints of stem it is to pro- 

 duce, makes its whole growth in length in the course of a few weeks, or 

 sometimes even in a few days, and then forms and ripens its buds for the 

 next year's similar growth. 



62. Indefinite annual Growth, on the other hand, is well marked in 

 such trees or shrubs as the Honey-Locust, Sumac, and in sterile shoots of 



FIG. 78. Butternut branch, with accessory buds, the uppermost above the axil. 



FIG. 79. Red-Maple branch, with accessory buds placed side by side. The an- 

 nular lines toward the base in this and in Fig. 72 are scars of the bud-scales, and 

 indicate the clace of the winter-bud of the preceding year. 



