42 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



slightly spotted with purple, arranged in a pyramidal panicle a 

 foot or more in height. Hab. Pyrenees, limestone rocks. 



S. crustata, Vest. — A very pretty species ; leaves spatulate 

 and glaucous, in small rosettes ; flowers white. Hab. Alps of 

 Tyrol and Carinthia. 



S. Hostii, Tausch. — Leaves glaucous and crenulate, arranged 

 in rosettes ; the flowers paniculate ; white, spotted with purple. 

 Hab. Maritime Alps, on limestone rocks. 



S. lingitlata, Bell. — Allied to S. longifolia. Leaves spatu- 

 late, in rosettes. Flowers in a corymbose panicle, pure white. 

 Hab. Maritime Alps and Apennines, on limestone rocks. 



S. lantoscana, Boiss. et Reut. — Leaves glaucous, in small 

 rosettes ; flowers arranged in pyramids, pure white. Hab. 

 Alps of Lantosca. A very pretty plant is the variety superba, 

 with very dense and large flowers. The varieties catalaunica 

 and cochlearis are also both very fine plants, and well worth 

 growing. These latter inhabit the Mediterranean district on 

 limestone rocks. 



S. Aizoon, Jacq. — Few species vary more than S. Aizoon, and 

 few intercross more readily. The leaves are mostly spatulate, 

 glaucous, and arranged in dense rosettes. The flowers appear in 

 panicles, white, spotted with purple. As a rule they inhabit 

 high mountains, but are not uncommonly found in low valleys. 

 The hybrids and forms of S. Aizoon are too numerous to be 

 mentioned here. All succeed in a well-drained border, or better 

 still on the rockery ; and on account of their vigorous habit and 

 rapid growth they are invaluable for that purpose. Hab. The 

 Alps, on rocks of gneiss, trachyte, and granite. 



S. Cotyledon, L. — The leaves are long, spatulate, deep green. 

 The flowers, in pyramids from 1 to 2 feet in height, pure white, 

 rarely spotted with purple. This is one of the most beautiful 

 of Saxifrages ; it is easily increased by division or by seed, and 

 is of a rapid growth. Our Continental friends grow it exten- 

 sively as a market plant. Hab. The Alps, Pyrenees, Jura, and 

 Central and North European mountains. The variety pyramid- 

 alis (often wrongly named ncpalcnsis) falls under this species, 

 and, like the varieties gracilis and clongata, differs only slightly 

 from it. 



S. mutata, L. — Leaves lingulate, deep green, in rosettes ; 

 flowers yellow. Hab. The Alps. In the summer of 1877 I found 



