BUDS 149 



It is not always possible to distinguish between a leaf 

 bud, a flower bud and a mixed bud. Most leaf buds are 

 readily differentiated from the flower buds because longer 

 and of a smaller diameter. 



Horse-chestnut has a typical mixed bud. The leaves are 

 covered with a dense mat of w r hite hairs and they surround 

 and cover the larger flow r er bud. 



Position. Classified according to position, buds are 

 apical, lateral, axillary, accessory, latent and adventitious. 



The bud is apical when it terminates the stem as in horse- 

 chestnut; it is lateral if it occupies the apex of a short branch; 

 it is axillary when it occurs at the side of the stem and in 

 the axil of the leaf, as in white ash, where the leaf scar is 

 seen immediately below the bud; it is accessory when more 

 than one bud occurs in the axil of the leaf, as in red maple. 



The accessory bud is superposed if it is above the primary 

 bud and collateral if it is at the side of the primary one ; a bud 

 is dormant or latent when it remains in the bud condition 

 during the growing season or for several growing seasons 

 but in an emergency, as when the normal buds are destroyed, 

 it may develop into a leaf or flower according to its class. 

 Finally, the bud is adventitious if it develops from the inter- 

 nodes or outside of the leaf axil. 



Arrangement. Buds, like stems, may be alternate, oppo- 

 site or whorled. 



Relation to the Stem. The bud is sessile if it is attached 

 directly to the stem, and stalked if it is attached to the stem 

 by a stalk. If, the bud is in close contact with the stem, as 

 in ailanthus, it is appressed; if it projects more or less, as in 

 shagbark hickory, it is divergent; if it is below the level of 

 the surface of the stem, as in northern prickly ash, it is 

 sunken. 



