ANOMALIES AND TRANSFORMATION'S OF LEAF-BrDS. 



101 



veyed downward by the bark and cambium cells, and are deposited 

 round a nucleus or central mass. 



197. Leaf-buds sometimes become extra-axillary (fig. 211 5), in 

 consequence of the non-appearance or abortion of one or more leaves, 

 or on account of the adhesion of the young branch to the parent stem. 

 In place of one leaf-bud, there are occasionally several accessory ones 

 produced in the axil, giving origin to numerous branches (fig. 212 b). 



Such an occurrence is traced to the presence of latent or adventitious 

 buds. Fig. 211 represents a branch, r, of walnut, p the cut petiole, 

 and b tAvo buds, of which the upper is most developed, while fig. 212 

 exhibits a branch of Lonicera tartarica, with numerous buds, b, in the 

 axil of the leaves, the lowest of Avhich are most advanced. By the 

 union of several such leaf-buds, branches are produced having a 

 thickened or flattened appearance, as is seen in the Fir, Ash, and 

 other trees. These fasciated (fascia, a band) branches, in some cases 

 however, are owing to the abnormal de- 

 velopment of a single bud. 



198. In the axil of the leaves of Lilium 

 bulbiferum, Dentaria bulbifera, and some 

 other plants, small conical or rounded bodies 

 are produced called bulbils or bulblets (fig. 

 213 b b b). They resemble bulbs in their 

 aspect, and consist of a small number of 

 thickened scales enclosing a growing point. 

 These scales are frequently united closely 

 together so as to form a solid mass. Bulbils 

 are therefore transformed leaf-buds, which 



Fig. 211. Portion of a branch, r, of the walnut, bearing the petiole, p, of a leaf which has 

 been cut In the axil of the leaf, several buds, 6, are produced, the highest of which are most 

 developed. 



Fig. 212. Portion of a branch, r, of Lonicera tartarica, bearing two opposite leaves, one of 

 which has been cut, the other, /, being preserved. In the axil of the leaves, clusters of buds, 6, 

 ure seen, the lowest of which are most developed. 



Fig. 213. Portion of the stem of Lilium bulbiferum with three alternate leaves,///, and three 

 bulbils or bulblets, b b b, in their axils. 



