98 PRESENT-DAY GARDENING 



even without roots in the soil. They like peat and are 

 easily propagated by cuttings. H. campanulata has elegant 

 umbels of good-sized, amber-coloured flowers ; H. carnosa, 

 pinkish-white flowers, is suitable both for the greenhouse 

 and the stove ; H. imperialis, a truly noble plant, has thick 

 leathery leaves, and reddish flowers, 3 inches across, borne 

 in large umbels. It should be remembered that new flowers 

 are produced on the old flower stalks as well as on the 

 young wood. 



HUMULUS 



H. Lupulus, the common Hop, is a vigorous, twining 

 perennial of great beauty when in fruit, and is sometimes 

 to be seen employed to good effect in gardens, notably 

 as a covering for bowers, or allowed to run wild over 

 shrubs. H.japonicus, which is much like the English Hop, 

 has a variety lutescens with leaves of a golden tint. Pro- 

 pagation by division in spring or from seeds. 



HYDRANGEA 



H. petiolaris (H. scandens) is a Japanese plant, which' 

 resembles Ivy in its mode of growth. It is quite hardy in 

 the south, and well adapted for covering tree stumps, but 

 requires a wall or cool conservatory in northern counties. 

 It has white flowers, in flat-topped cymes, 8 to 10 inches in 

 diameter. It likes a rich, loamy soil, and is increased by 

 cuttings. 



IPOMCEA (see Plate XIII) 



Chiefly tropical plants resembling convolvulus. /. pur- 

 purea (Convolvulus major), and its numerous forms, /. 



