98 STRUCTURAL BOTANY. [83,84. 



buds are especially noted as being either active or 

 latent. In the former case they are unfolded into 

 branches at once, or in the Spring following their 

 formation. But latent buds suspend their activities 

 from year to year, or perhaps are never quickened 

 into growth. Axillary buds become terminal so soon 

 as their development fairly commences ; therefore 

 each branch also has a terminal bud, and, like the 



273, Bud of Currant unfolding, the scales gradually becoming leases. 2"4, Bud of Tulip-tree, the scales 



unfolding into stipules. 



main axis, is capable of extending its growth as long 

 as that bud remains unharmed. If it be destroyed by 

 violence or frost, or should it be transformed into a 

 flower-bud, the growth in that direction forever 

 ceases. 



248. The suppression of axillary buds tends to 

 simplify the form of the plant. Their total suppres- 

 sion during the first year's growth of the terminal 

 bud is common, as in the annual stem of Mullein and 

 in most perennial stems. When axillary buds remain 

 permanently latent, and only the terminal bud unfolds 

 year after year, a simple, branchless trunk, crowned 



