400 



LJSSSOJyS WITH PLANTS 



two of the branches have found support, and 

 have coiled spirally, thereby drawing the plant 



■,Mi:!',:::,. near the support; 

 but notice that 

 there are places in 

 each where one coil 

 is missing. At 

 these places, the di- 

 rection .of the coil 

 was changed. The 

 middle branch failed 

 to find a support, 

 and has twisted up 

 into a querl ; and the same thing has occurred 

 in c. 



Fig. 420. 

 Tendril of Boston 



504o. Farmers' boys say that a watermelon is ripe when the 

 querl is dead Cwhieh, however, may not be true). What is this 

 querl t 



5046. The tendrils of some plants are provided with discs at the 

 ends, rather than hooks, by means of which they attach to a support.. 

 Compare the common Virginia creeper ; also the root-like tendrils of 

 the Japanese ampelopsis or Boston ivy (Fig. 420). Can the pupil show 

 that the tendril in Fig. 420 is stem, not root ? 



505. A clematis is shown in Fig. 421. Here 

 the petiolule of the terminal leaflet is acting as a 

 tendril, although all of the petiolules and the pet- 

 iole have the same habit. Leaves, then, may act 

 both as tendrUs and foliage. 



