Modified leaves assist climb: passion flower
 

Vetches and passion flowers climb other plants with the help of leaves modified into tendrils.

         
  "Vetches and passion flowers have modified some of their leaves even more extremely and converted them into tendrils. These grope around in space until they touch the stem of another and swiftly coil around it." (Attenborough 1995:161-162)
  Learn more about this functional adaptation.