304 



THE GARDENER'S ASSISTANT. 



of hairs. The flowers are also brighter yellow than in 

 the other species, and the petals less twisted. China, 1897. 



H. virginica, Witch-Hazel. — A very hardy shrub or 

 small tree, with obovate leaves, and clustered yellow 

 flowers produced in autumn and winter. North Ame- 

 rica, 1736. 



Hedera, Ivy. — The varieties in cultivation at the 

 present time are exceedingly numerous, and many of 

 them highly ornamental. The "gold", "silver", and 

 cut -leaved varieties should be employed only where the 

 space is small, and preferably against a north wall. The 

 former include marbled, margined, striped, spotted, 

 blotched, and other kinds of variegation. There are also 

 tricoloured variegations in which red is included. The 

 same remark applies to those having cut or lobed leaves, 

 as palmata, pedata, sagittifolia, &c. The common H. 

 Helix and those green-leaved varieties sold by nursery- 

 men under the names canaricnsis, algeriensis, and Rcg- 

 neriana, &c, are suitable for covering large spaces. The 

 additional varieties named have usually larger bolder 

 foliage than the common one, and they bear the name 

 of giant Ivy in common. The tree Ivies of the nurseries 

 are plants propagated from the flowering branches of the 

 others in which the habit is more or less erect and all the 

 leaves undivided. The common forms have black berries, 

 but there is a fine yellow-berried form celled chrysocarpa 

 and baccifera lutea. 



HEDYSARUM multijugum. — -A loose-growing shrub 2 to 

 3 feet high, with pinnate leaves composed of numerous 

 oblong gray-green leaflets. The flowers are borne on 

 erect racemes, and are bright rosy-purple. Requires a 

 sunny position. Mongolia, 1SN3. 



HeLIANTHEMUM. — Prostrate, trailing, or erect under- 

 shrubs, with yellow, white, or red flowers, resembling 

 those of the genus Cistus, but much smaller. The species 

 are numerous and very similar in appearance ; they 

 succeed well on rock-work, and are suitable for the front 

 row of borders on a warm dry soil in the south-west parts 

 of the kingdom. 



//. formo8um. — About 4 feet high, with three-nerved 

 leaves, and large flowers for the genus — yellow, with a 

 purple blotch at the base of each petal, produced through- 

 out the summer. Southern Europe, 17 VI ». 



II. vulgare, Hock Hose or Sun Rose. — The varieties of 

 this indigenous trailing species are the most desirable 

 for general cultivation. The flowers, produced through- 

 out the summer, vary from yellow in divers shades to 

 rose and deep-red. The varieties are found in gardens 

 under the names croceum, roseum, grandiflorum, macran- 

 thiiiu. Fire-l tall. Magenta Queen, &c. There are also 

 double-flowered varieties. 



Hibiscus syriacus (Althaea frutex). — An ornamental 

 shrub 5 to 8 feet high, with erect straight branches, and 

 producing in September large, axillary, white, yellow, 

 rose, purple, violet, and variously-spotted flowers. There 

 are also double-flowered varieties of divers colours, and 

 one with variegated foliage. Syria, 1596. 



Hippophae rhamnoides, Sea Buckthorn. — A low tree 

 or shrub, with small linear leaves, and minute yellow 

 flowers, succeeded by bright orange -coloured berries, 

 which render it one of the most ornamental trees in 

 winter. It is a native of the east coast of Britain, and 

 very suitable for planting near the sea as a shelter. It 

 grows satisfactorily even in positions that are occasionally 

 drenched by the sea spray. Being dioecious, it is necessary 

 for the development of fruit that trees of both sexes 

 should be planted not far apart. 



Hydrangea. — Dwarf shrubs, with undivided or lobed 



leaves, and terminal panicles or corymbs of white, pink, 

 or blue flowers. The Chinese and Japanese species only 

 attain perfection in sheltered situations, and they succeed 

 admirably on the coast in the south and west of England, 

 or in Ireland. The North American species are hardier, 

 but less ornamental. 



H. arborescens. — This resembles in habit the more 

 familiar H. Hortensia, but its agreeably-scented flowers 

 are nearly all fertile, that is, they have not the enlarged 

 calyx which renders the inflorescence of the latter so con- 

 spicuous; they are borne in summer. North America, 1736. 



H. Hortensia. — The varieties of this are numerous, but, 

 except in the warmer parts of the country, they require pro- 

 tection in winter. The variety Lindleyana is the hardiest 

 and has the outer flowers sterile and enlarged with either 



Fig. 370.— Hydrangea Hortensia Mariesii. 



white or pink toothed lobes ; Mariesii (fig. 370) is re- 

 markable for the large size of its pink barren flowers, 

 which are 3 inches across; cairulescens has bright -blue 

 sterile flowers ; Otaksa has a very large inflorescence, in 

 which nearly all of the flowers are sterile and of a blue 

 colour; and stellata prolifera has pink flowers with 

 several series of sepals in the sterile ones. There are 

 also varieties having the foliage variegated with yellow 

 and red. China, 1740. 



H. paniculata. — Inflorescence much more elongated 

 than that of H. Hortensia. The variety grandiflora 

 (fig. 371) is a very handsome plant in which all the 

 flowers are sterile and pure -white. It attains a height 

 of 4 to 6 feet, and when in bloom, towards autumn, is 

 very attractive. Japan. 



H. petiolaris (H. scandens).—A climbing plant, quite 

 hardy in the south, but needing a wall in the north. It 

 resembles Ivy in mode of growth, and can be used for 

 covering old tree stumps. Flowers white, in large broad 

 cymes, appearing in June. Japan, 1876. 



H quercifolia. — A shrub about 3 feet high, with ovate, 

 lobed leaves ; the flowers greenish -white or pink, in part 

 barren. Florida, 1803. 



//. radiata (nirea). — A shrub; leaves white beneath, and 

 white flowers, the outer sterile and enlarged; it grows 

 from 4 to 6 feet high in its native habitais on the banks 

 of the Savannah, but scarcely reaches that stature in this 

 country. North America, 1786. 



