Trees of Neiv York State 



47 



scales, are characteristie stnietnres of twigs and present many 

 features which are of valne in identification. Such buds may be 

 classed as follows : 

 I. As to position. 



a. Normal. 



1. Terminal.* When terminal on the end of a twig. 



(Figs. 67 and 6H.) 



2. Axillary. When borne laterally on a twijj in the 



axil of a leaf. 



b. Adventitious. Abnormal buds produced under the 



stress of unusual conditions on any part of the root, 

 stem, or leaf. 



c. Accessory. Additional buds produced in addition to 



the normal bud. 



1. Lateral accessory. Produced laterally, usually 



on either side of the normal bud. 



2. Superposed. Produced above the normal bud. 



7 5 



7 6 



Bud Dissection Showing Origin of Bud Scales 



* Many woody plants are pecuHar in developing pseudo-terminal buds. (Fig. 68.) 

 (irowtli "apparently continues into mid-summer until the available food supply is 

 exhausted and the terminal growing point then withers and sloughs off, leaving a 

 more or less circular scar with a ring of vascular tissue exposed. The last axillary 

 bud then takes over the function of a terminal bud and continues the axis of growth. 

 The result Is a twig which is really a succession of branches developed by sympodial 

 growth. 



