DIOSCORjEA 93 



be planted out in the stove to mount up pillars, and then 

 be trained along the rafters. After flowering, the shoots 

 require to be close pruned and thinned. Propagated by 

 cuttings of the young side shoots taken off with a heel. 

 C. purpureum has large, flat racemes of purplish-crimson 

 flowers ; those of C. grandiflorum are scarlet. There are 

 said to be yellow and white flowered species. 



CONVOLVULUS 



Bindweed. Annual or perennial herbs and sub-shrubs, 

 the majority being twiners. C. arvensis, with white or pink 

 flowers ; C* septum, the common Bindweed, large white 

 flowers ; and C. soldanella, which has the merit of thriving 

 in pure sand, are attractive when in flower, though per- 

 haps chiefly notable as troublesome native weeds. Other 

 cultivated species are C. mauritanicus and tricolor, the 

 latter an annual. The greenhouse species do best in a 

 compost of loam, leaf soil, and peat. The closely related 

 Ipomceas are more showy plants. 



DIOSCORJEA 



Yam. Ornamental-leaved climbers, including both hardy 

 and tender species, with large tuberous roots. Their white 

 or yellow flowers are inconspicuous. In winter the roots 

 should be stored in dry sand. The most ornamental is 

 D. multicolor, of which there are varieties with prettily 

 variegated foliage. Should be planted in a rich, loamy 

 soil, and be liberally watered whilst growth is active. 

 Propagated by division. 



