ANOMALIES AND TEANSFOEMATIONS OF LEAF-BUDS. 117 



Leaf-buds sometimes become extra-axillary (%. 228 6), in con- 

 sequence 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. 229 6). 



Pig. 228. Pig. 229. 



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

 buds. Fig. 228 represents a branch, r, of walnut, p the cut petiole, 

 and 6 two buds, of which the upper is most developed ; while fig. 229 

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

 axil of the leaves, the lowest of which 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 /asciaied [fascia, a band) branches, in some cases, 

 however, are owing to the abnormal development of a single bud. 



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. 230 b b b). They resemble 

 bulbs in their aspect, and consist of a 

 small number of thickened scales enclos- 

 ing a growing point. These scales are 

 frequently united closely together, so as 

 to form a solid mass. Bulbils are there- 

 fore • transformed leaf-buds, which are 

 easily detached, and are capable of pro- 

 ducing young plants when placed in 

 favourable circumstances. 



Occasionally leaf-buds are produced naturally on the edges of 



Pig. 22S. Portion of a branch, r, of the walnut, bearing the petiole, p, of a leaf which 

 has been cut. In the axU of the leaf, several buds, 6, are produced, the highest of which 

 are most developed. Fig. 229. 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, h, are seen, the lowest of which are most developed. Fig. 



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

 bulbils or bulblets, 6 6 6, in their axils. 



Fig. 230. 



