32 



OEGANOGRAPHY AND GLOSSOLOGY. 



compensation, the stipules (s, s) are very much developed, and perform the office of 

 leaves. In 8milax (fig. 129), the petiole bears two lateral tendrils below the single 



128. Aphaca. Petiolax tendrils. 



126. Pea. Leaf with tendrils formed from leaflets. 



130. Vine. Tendrils formed from peduncles. 



cordate blade, which may be regarded as 



the lateral leaflets of a compound leaf, 



reduced to their median nerves. The 



lateral position of the solitary tendril in 

 ■ the Melon (fig. 61) and other Cucurhitacece, 



together with the fact that two tendrils 



occasionally occur, one on each side of 



the leaf, has led most botanists to regard 



it as a stipule, of which the corresponding 



one is suppressed ; but the occurrence of 



two tendrils is very rare, and these are 



never precisely on the same level. On the 



other hand, unlike a true stipule, the 

 tendril of Cucurlitacew is derived from a vascular bundle remote from that which 

 produces the leaf, and is separated from the petiole of the latter by buds. Upon 



129. Smilax. 

 Stipulaiy tendrils. 



127. Vetch. 

 Pinnate leaf with foliolar ten- 

 drils and winged petiole. 



