338 ROCK GARDENS 



R. a7iemo7ioides. — Cool, moist position, in light loam. Leaves 

 glaucous green, and divided. Large white, pink-tinted flowers, on 

 stems 4 to 6 inches high, in April and May. Hardy, and easily 

 cultivated. A very charming little plant. Increased by seed or 

 division. 



R. bulbosus fi. pi. — This is a double variety of the common 

 Buttercup. 



R. bulbosus F. M. Burton. — Is a pale, sulphur-coloured variety of 

 the common Buttercup. 



R. crenatus. — Gritty soil in open position. Very similar to 

 R. alpest7is in habit and appearance. 



R. glacialis. — Open position in very gritty, rather heavy, moist 

 loam. Forms good tufts 6 to 8 inches high. Of spreading habit. 

 Leaves palmate, dark green, and usually smooth, but some are 

 downy. Flowers white or reddish, suffused with purple, with a 

 hairy calyx, borne in profusion from June to August. It is of 

 easy culture, and readily increased by division. This species is 

 found growing at a higher elevation than any other European plant. 



R. gramineus. — Open position in cool, light loam. Grows 6 to 

 12 inches high. Grass-like, bluey-green leaves. Flowers yellow, 

 borne three or four on each erect stem. Blooms in May and June, 

 and very floriferous. Of easy culture, and a very charming plant 

 of moderate growth. Division or seed. 



R. Lyallii. — Peaty soil in open position. Very large, peltate, 

 glossy leaves. Pure white, waxy flowers, 3 to 4 inches across. 

 Grows 2 to 3 feet high. A very difficult plant to cultivate, and as 

 handsome as difficult. 



R. inontanus. — Open position in light, sandy loam. Dwarf and 

 compact-growing, and of spreading habit. Flowers yellow, and 

 freely produced from May to July. Of easy culture and vigorous 

 growth. Increased by seed and division. 



R. nyssanus. — A large edition of the common Buttercup, with 

 citron-yellow flowers in May. A free-growing species. 



R. parnassifolius. — Open position in light, calcareous soil. 

 Leaves dark brownish-green, rather heart-shaped. Flowers pure 

 white, one to a dozen borne on each many-branched stem, about 5 

 inches high. A most lovely and attractive plant, of easy culture. 

 Propagated by division or seed. 



R.pyrenaeus. — Rather moist, open position in light loam. Grass- 

 like leaves, 6 to 10 inches high. Flowers white, produced from 

 June to August. Of easy culture, and a very attractive plant, 

 especially when grown in fairly large masses. Very similar to this 

 is R. plantaginetis, in fact by some considered only a variety. 



R. rutaefolius. — Open situation in sandy loam. Leaves pinnate 

 and glaucous, and of a bluey-grey colour. Flowers white, with an 



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