240 ROCK GARDENS 



spreading plant about 4 inches high, with very narrow leaves 

 arranged in clusters and pretty bell-shaped white flowers. Increased 

 by division. A charming little plant. 



A. Montana. — Light sandy loam in partial shade. A fairly quick- 

 growing plant of trailing habit. Narrow dark green leaves and a 

 profusion of large pure white flowers in early summer. Seed and 

 division. One of the most attractive flowers of early summer, and 

 should be grown so as to fall over the face of a rock. 



A. m. grandiflora. — Very similar to the above. Flowers larger. 

 Flowers in June. 



A.purpurascens. — Ordinary soil in sun. Prostrate habit. Densely 

 tufted, narrow, pointed, glossy leaves, with pale purplish, star-shaped 

 flowers in May. A free bloomer. Propagated by division or 

 seed. A very pretty little plant. 



A. verna. — Light sandy soil in sun. Grows in neat, prostrate tufts 

 of emerald-green leaves, awl-shaped, with numerous small, starry 

 white flowers in April. Also an attractive little plant, readily pro- 

 pagated by seed. 



A. multicaules. — Like A. balearica^ but larger flowers and more 

 ovate leaves. 



A. tetraquetra. — White flowers and prostrate habit. A pretty 

 little plant. 



Other varieties grown, but of more botanical than garden interest. 



Arethusa Bulbosa 



Shady position in very wet soil, composed of spongy peat and 

 sphagnum moss. Hardy American orchid with solitary rose-purple 

 flowers, sweet-scented and very lovely. A very difficult plant to 

 cultivate. 



Armeria (Plumbaginaceae), Thrift 



Well-known plants of easy culture and much beauty. 



A' caespitosa. — Very sandy loam in sun. The dwarfest of the 

 genus, only growing i to 2 inches high. Forms tufts of grassy 

 foliage. Pale lilac flowers in June. 



A. cephalotes (syns. A. latifolia and A. fortjtosa). — Sandy loam 

 in sun. Grass-like leaves about 8 inches high in dense tufts, from 

 which spring tall stems 15 to 20 inches high, each bearing round, 

 dense heads of closely packed flowers of a bright rose colour. 

 Quite easy of cultivation, and readily increased by division or seed. 

 Colour liable to variation when grown from seed. There is a white 

 form, alba^ also a handsome plant. 



A. mariti7?ia (syn. A. vulgaris). — The well-known Sea Pink of 

 Great Britain, growing in very sandy soil. There are several 



