34. CKASSULACE^. 403 



a slight vaiiety of S. reflexum; while the S. Fosterianum, 

 ol" the same work has somewhat the look of a distinct spe- 

 cies. But with the specimens communicated to my her- 

 barium by botanical Mends, the converse holds better; 

 those labelled " rupestre," looking more distinct, and more 

 like the figiues of " S. Fosterianum." I have never seen 

 either in theu* reported habitats ; and it is not easy to 

 judge from cbied examples. 

 X. ^8^<vv.x^^ ^^^ ^4^ Z/-^. ///_ ^ c^^ . 



417. Sempervivum tectoru3i, Linn. 



h-^yf./ Area (1 2 3 4 5 f 7 8 9 10 11 *^ 13 14 15). 



1{D!>~'. Alien. This plant affords a fine instance of the prone- 

 ness of human beings to foUow blindfold any example once 

 set, without taking the trouble to think whether it be right 

 or wi-ong, wise or foolish. So far as I am aware, there 

 never has been a locality announced for the Sempersdvum 

 which had any pretensions to be accounted natural ; and 

 yet, after being once enumerated among British plants, 

 every succeeding wiiter retams the plant as a thing of 

 course. And being kept in the more general Floras, the 

 authors of most of the local Floras (17 in 20) duly enter 

 it in their own pages also. -^ yj^ t^ /i^/ r-^'^^^Jti^ 'h.<u.^ri^ 

 A /L^ x^ ^»,. *^- ^ • ^ . X /a . 



418. Cotyledon Umbilicus, Linn. 



Area 1 2 3 4 5 6 7 8 9 10 * 12 13 * * 16. 



South Umit in Cornwall, Isle of Wight, Kent, 

 j North limit in Argj-leshire and Yorkshire. 



' Estimate of provinces 14. Estimate of counties 40. 



Latitude 50 — 57. Atlantic type of distribution. 



Agrarian region. Inferagrarian — Superagrarian zones. 



