ALPHABETICAL LIST OF PLANTS 339 



orange centre, which are borne in some profusion from May to 

 July. Of easy culture, and increased by division or seed. 



R. Segide7i. — Almost similar to R. glacilis. 



R. Thora. — Open position in gritty loam. Leaves smooth, 

 growing about 6 inches high. Flowers yellow, and borne in some 

 profusion in May. Of easy culture. The tuberous root is said to 

 be poisonous. 



Rhexia virginica (Melastomaceae) 



A half-shrubby plant for the bog garden in deep, moist, sandy 

 peat. Forms a compact little bush 6 to 12 inches high. Flowers 

 rosy-purple, on square stems, borne during the summer. Hardy, 

 but rather difficult to cultivate. Division. Other species of this 

 genus are not sufficiently hardy. 



Rhododendron (Ericaceae) 



Of this large genus of beautiful evergreen shrubs I shall only 

 deal with those of dwarf habit suitable for using amongst the larger- 

 growing rock plants ; but for massing on heights to form a back- 

 ground there are no better shrubs, and few as good. 



R. ciliatum. — Peaty soil in sheltered position. Hairy leaves, 

 and flowers reddish-pink, and of good size. Compact and dwarf 

 habit, only growing about 2 feet high. A very good shrub. 



R. ferrugineum (Alpine Rose). — Has scarlet-coloured flowers. 



R. hirsutum. — Red flowers. 



R. myrtifoliiim. — Pink flowers. 



R. ovation. — Rosy-purple, spotted darker purple. 



R. parvi/iorum. — Sulphur-coloured flowers. 



R. 7'acemosum. — Pale pink flowers. 



The above are a few of the dwarfer species, but there are others 

 equally good. They all like a sheltered and cool position in a 

 fibrous, peaty soil devoid of lime, except R. hirsutum, which will 

 grow in a limestone soil. 



Rhodora canadensis (Ericaceae) 



A deciduous shrub nearly allied to the Rhododendron. Likes 

 a moist, peaty soil. Leaves oblong, and downy beneath. Rosy- 

 purple flowers in clusters before the leaves. Grows 2 to 4 feet 

 high. 



Rhodothamnus chamaecistus (Ericaceae) 



A shrub also nearly allied to the Rhododendron genus. Peaty 

 soil in limestone fissures of rocks. Dwarf habit, only growing 



