REVIEW ON CLIMBING PLANTS 



113 



eutropic (with the 

 sun). Fig. 167 shows 

 the two directions. 



EEVIE w . Why do 

 plants climb? How do 

 they climb? Explain 

 what is meant by scram- 

 blers. By root-climbers. 

 What is a tendril? How 

 does it find a support? 

 Why and how does it 

 coil? How does it grasp 

 its support? What is the 

 morphology of the ten- 

 dril of Virginia creeper? 

 Why? Of the pea? Of 

 the clematis? What is 

 a twiner? How does it 

 find a support? 

 What is a dex- 

 trorse twiner? 

 Sinistrorse? 



NOTE. The 

 pupil may not ' 



understand why the branch (as tendril and flower- cluster) 



stands opposite the bud in the grape and Virginia creeper. 



Note that a grape-shoot ends in a tendril (a, Fig. 168). 



The tendril represents the true axis of the shoot. On the 



side a leaf is borne, from the axil of which the 



branch grows to continue the shoot. This branch 



ends in a tendril, &. Another leaf has a branch in 



its axil, and this branch ends in the tendril c. The 



real apex of the shoot is successively turned aside 



until it appears to be lateral. That is, the morpho- 

 logically terminal points of the successive shoots are 



the tendrils, and the order of their appearing is a, 



b, c. The tendrils branch: observe the minute scale 



representing a leaf at the base of each branch. This 



type of branching the axial growth being continued 



by successive lateral buds is sympodial, and the 



branch is a sympode. Continuous growth from the 



terminal bud is monopodial, and the branch is a monopode. 



H 



167. 



Dextrorse and siriistrorse twiners. False 

 bitter-sweet and hop. 



168. Sympode 

 of the grape. 



