Hardy Exotic Plants for Naturalization. 75 



or division. — In rocky or very bare places, in any aspect 

 or soil. Bees are very fond of the flowers of this plant. 



Mountain Houseleek. Sempervhmm montanum. 

 Switzerland. Evergreen perennial ; 6 to 9 inches ; red ; 

 summer ; seed or division.^Same positions as for the 

 preceding ; both will thrive on walls. 



Sotaoliferous Houseleek. Sempervhmm soboliferum. 

 Evergreen perennial ; 4 to 6 inches ; pale yellow ; 

 summer ; seed or division. — ^Very bare and fully exposed 

 places on rocky or stony ground. Should be allowed to 

 spread into compact tufts. 



THE SAXIFRAGE FAMILY. 



Silvery Saxifrage. Saxifraga Aizoon. Pyrenees. 

 Evergreen perennial ; 6 to 9 inches ; white spotted ; 

 early summer ; seed or division. — Open bare spots on 

 fully exposed rocky or bare ground, in any soil. 



Two-flowered Saxifrage. Saxifraga biflora. Swit- 

 zerland. Evergreen perennial ; 2 to 4 inches ; red ; 

 early summer ; seed or division. — Moist rocky, bare spots, 

 fully exposed, and in sandy peat or loam. 



Heart-leaved Saxifrage. Saxifraga cordifolia. 

 Siberia. Evergreen perennial; 9 to 18 inches; rose; 

 spring and early summer ; division. — Banks, rough rock- 

 work, by wood walks, on wild, sunny slopes. 



TMck-leaved Saxifrage. Saxifraga crassifolia. 

 Siberia. Evergreen perennial; i to ij feet; rose; 

 spring and early summer ; division. — Same situations as 

 the preceding, and like it grows in any soil. 



Crustate Saxifrage. Saxifraga crustata. Pyre- 

 nees. Evergreen perennial ; 3 to 6 inches ; whitish ; 



