ROCK AND ALPINE. PLANTS 143 



does fairly well and reproduces itself freely 

 from seed on a dry earth wall, but the Winter 

 fogs kill it off in quantity. Scabiosa caucasica 

 alba has flowered freely in a town garden 

 for the past seven years, and, though it does 

 not increase, yet the annual growth is satis- 

 factory. Of Sedums the common Stonecrop 

 (Sedum acre) is useful for covering patches 

 of the rock garden, while 5. glaucum may 

 also be relied upon as a fairly satisfactory 

 plant when used in smoky localities. Sedum 

 rhodiola is a capital plant for smoky local- 

 ities, where it gains in strength each year and 

 flowers profusely. Two kinds of Thrift (Ar- 

 meria) do well, the showiest being A. Cepha- 

 lotes r ubra, which sends its bright pink 

 flowers well above the tufted green foliage. 

 Both it and A. vulgaris alba are excellent 

 town plants and show off to good advantage 

 in the rock garden when planted in clumps. 

 Of the Meadow Rue (Thalictrum), two 

 species thrive in a fairly satisfactory way 

 indeed, have done well for several years past : 

 they are T. alpinum, a neat and very desir- 



