366 CRASSULACE^. [part ii. 



except as regards the stamens, which are some- 

 times twice the number of the petals, and 

 arranged in two series, those in one series being 

 abortive. At the base of each carpel is a kind 

 of scale or gland, and this is the case with most 

 of the genera included in the order. There are 

 several species of Sempervivum, natives of the 

 Canary Isles, w'hich are very ornamental, and 

 which have yellow flowers ; but this genus, and 

 that of Sedum, the Stone-crop, have been lately 

 remodelled by JSIr. Philip Barker 'Webb, and 

 some new genera formed out of them. The 

 principal other genera in the order are Crassula 

 and Kalosanthes ; the latter having been formed 

 out of the former, and including those species 

 of Crassula which have a tube-shaped corolla, 

 with a spreading limb, divided into five seg- 

 ments, while the flowers of those species which 

 have been left in Crassula have five distinct 

 petals. All the plants belonging to the order 

 have succulent leaves ; and in all of them the 

 number of the petals, sepals, and carpels, is the 

 same, and of stamens either the same, or twice 

 as many. In the common Houseleek, the 

 anthers sometimes produce seeds instead of 

 pollen. 



