CRASSULACEiE. 



79 



are not particularly striking, and are either green, yellow, 

 violet, or purple ; nearly forty species have been introduced. 



C. (Echeveria) coccinea and lurida have scarlet flowers; 

 grandifolia, orange ; acutifolia, scarlet and yellow ; racemosa 

 and pulverulenta have red flowers. 



SEMPERVIVUM. (Houseleek.) 



Gen. Char. (Dodecandria Bodecagynia.) Calyx twelve-parted ; 

 petals twelve ; stamens and styles twelve ; capsules twelve. 



From semper vivere, to live for ever, in allusion to the 

 long life of the plants. The common Houseleek is of this 

 genus ; and from Madeira and the Canary Islands we have 

 several species introduced into the greenhouse, the flowers 

 of most of which are yellow ; the forms of many are very 

 curious, particularly tabulceforme, which has the leaves 

 closely packed together in a broad flat disc ; arachnoideum, 

 the leaves of which have entangled hairs ; tortitosum, twisted ; 

 urhicum, wedge-leaved; aureitm, the golden, and some others; 

 S. (JEoniwn) Youngianum, a native of the Canaries, and 

 arboreum, the Tree Houseleek, from the Levant, have 

 yellow flowers ; the latter has two varieties, one with varie- 



