SHOOTS. 



61 



list of climbers. In this case the stems are too weak to 

 stand alone, but by interlacing with one another they may 

 keep an upright position. There are stems, also, which 

 climb by twining about their support, as the hop vine and 



Fig. 51. A cluster of smilax, showing the tendrils which enable it to climb, and also 

 the prickles. — After Kerxer. 



morning glory ; others which put out tendrils to grasp the 

 support (see Figs. 51, 52), as the grapevine and star 

 cucumber ; and still others which climb by sending out 

 suckers to act as holdfasts, as the woodbine (see Figs. 53, 

 54). In all these cases there is an attempt to reach towards 



