290 THE BOOK OF GARDENING. 



The methods of raising alpines are the same as those practised 

 in raising hardy herbaceous perennials, and are mentioned under 

 that heading. 



The following is a good selection of rock plants : 



Acantholimon glumaceum {Statice Araratt) grows from 3in. 

 to 6in. high, and bears six- to eight rose-coloured flowers in a 

 head much after the fashion of the Thrift (Sea Pink). It is of 

 tufted habit, forming cushions of dark green prickly foliage. 



Achillea rupestris forms cushions of evergreen foliage, and 

 from June to September produces heads of pure white flowers on 



stems 6in. high. A. tomentosa (Fig. 

 169) is an attractive plant, growing 

 from 6in. to i2in. high, and having 

 flat heads of bright yellow flowers. 

 A. umbellata is a fine rock plant, 

 6in. high, having silvery foliage, and 

 heads of white flowers. 



Adonis is a genus of ornamental 



herbaceous plants, suitable alike for 



the rockery or for the mixed border. 



Fig. 169. — Achillea A. pyrenaica is a somewhat rare 



tomentosa. species, producing numerous stems 



from i2in. to i8in. high, and forming 



a mass of Fennel-like .foliage. The flowers resemble those 



of the Anemone. They are upwards of zin. across, of a 



beautiful yellow colour, and are borne in June and July. A. 



vernalis is a handsome plant, growing, from 8in. to i2in. high, 



and bearing large yellow flowers during March and April. 



Alyssum. — See "Spring-Bedding Plants." 



Androsaces are small, interesting alpines, suitable for either 

 rockwork or pot culture. The woolly-leaved species must be 

 protected from the rain during winter. Propagation is effected 

 by seeds or division. A. carnea forms dense tufts 3m. to 

 4in. high, covered with clusters of pink or rose-coloured flowers 

 with yellow eyes. A. lanuginosa has greyish foliage on trailing 

 stems, and is a suitable subject for planting so that the 

 shoots may hang over the face of the rockwork. This has 

 also umbels of rose-coloured flowers with yellow centres, borne 

 during July and August. A. sarmentosa (Fig. 170) is one of the 

 most beautiful of the genus, producing rosettes of downy, foliage, 

 and large umbels of rose-coloured flowers with white eyes. It 

 grows about 6in. high, and flowers during May and June. A 

 position in a chink of the rockwork and a sandy loam suit it 

 admirably. 



