REVIEW ON CLIMBING PLANTS 



113 



107. Dextrorse .-ind siiiisti 



bitter-sweet and hop. 



eutropic (witli the 

 sun). Fig. 167 shows 

 the two directions. 



Review. — 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, 

 h, 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 



:i 



r 



^ 

 ^ 



1()8. Sympode 

 of tlie grape. 



