STONECROP TRIBE. 



235 



SEMPERvivuM TECT<5RUM (Common House-leek). 



3. SEMPERVIVUM (House-leek). 



1. S. tectdrum (Common House-leek). A common 

 but scarcely indigenous plant, growing on the roofs of 

 cottages. The leaves are thick and juicy, fringed at the 

 edges, and grow in compact rose-like tufts. Each of the 

 purple flowers contains 12 perfect and 12 imperfect 

 stamens ; the latter, which are arranged alternately with 

 the petals, frequently bearing anthers containing em- 

 bryo seeds, like those found in the carpels, but of course 



