34. CRASSULACE^:. 401 



tending to establish a lower mean than 44 for tlie place 

 mentioned. But it would seem to be a general nile, that 

 observations taken hourly give a higher mean for the yeai- 

 than is given by calculating the temperatm-e from the 

 means of the daily and monthly extremes. 



^. f>^- '^^ ■ /^- ^ ^i" 415. Sedum sexangulare, Linn. 



Area [1 (2 3 4) 5 -( * f * 10]. 



Alien .? I had cast the distribution of this species into 



the fomiula adopted for the natives, although in doubt as 



to the propriety of tlnis treating it. While these pages are 



going through the press, Mr. Newnnan favours me with 



& some remarks on the species of Sedum, which induce me 



to change the formula, and remove S. sexangulare into the 



^ ^ category of aliens. Hooker and Babington allow it to pass, 



u^ -^ without brand, as a true native. Henslow admits it among 



^ Hr the native plants of Cambridgeshire. Mr. Newman, who 



has paid much attention to the Sedums, and seen their 



habitats in Wales, holds the S. rupestre and Forsterianum 



to be two distinct species, and both native ; S. glaucum, if 



aught else than reflexum, to be " a nonentity, as regards 



Britain " ; S. reflexum and sexangulare to be unsatisfactoiy, 



in the character of natives. 



V i^^^'^<^ /-^^C 416. Sedum reflexum, Linn. 



416,b. Sedum glaucum, '■'■ DonnT 



Area 1 2 3 4 5 6 7 8 9 10 11 * (13 14 15). 



South limit in Devon, Isle of Wight, Sussex. /St'*'<'>^<' 



, North limit in Northumberland or 1 



I Estimate of provinces 11. Estimate of comities 30. 



3 F 



1t,o 



