THE CONVOLVULUS FAMILY. 187 



and bowing around as tliey grow, they have become 

 climbers by twisting about other plants, till the habit 

 became a fixed feature. 



It can be held in abeyance, for French beans, like 

 scarlet-runner beans, climb by their stems. Yet dwarf 



Fig, l&.—Ipomce'a. 



non-climbing beans have been established. They will, 

 however, occasionally revert to the habit of climbing. 



Ipomge'a. — Fig. 76 gives the details of a species of 

 Tpomw'a, of which there are several dispersed through 

 the Colony. 



The calyx of five sepals is gamosepalous but deeply 

 divided (1 and 5). The corolla is spirally twisted up in 



