44. COMPOSIT/E. 89 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 52 — 47. 



Native. Pascual, Septal. A very doubtful species ; the 

 distribution of which, as above indicated, is equally uncer- 

 tain. The formula has been filled up from a consideration 

 of the localities published for C. Jacea, C. nigrescens, and 

 C. nigra var. radiata. But, first, it is very dubious whether 

 there really is any species distinct from C. nigra, to answer 

 to the name of C. nigrescens ; and, secondly, assuming that 

 such a real species does exist in nature, I find myself un- 

 able to decide which of the various recorded localities be- 

 long strictly to C. nigrescens, and which of them belong 

 only to C. nigra; or, it may be, to C. Jacea, in some in- 

 stances. 



611. Centadrea nigra, Linn. 



Area general. 



South limit in Cornwall, Isle of Wight, Kent. 

 North limit in Shetland, Orkney, Hebrides. 

 Estimate of provinces 18. Estimate of counties 82. 

 Latitude 50 — 61. British type of distribution. 

 Agrarian region. Inferagrarian — Superagrarian zones. 

 Descends to the coast level, in the Peninsula. 

 Ascends to 400 or 450 yards, in East Highlands. 

 Range of mean annual temperature 52 — 42. 

 Native. Pascual. See a remark respecting this species 

 under the head of C. Jacea. 



/^ y^ ^^f. A .^^y 612. Centaurea Cyanus, Linn. 



Area general ? 



South limit in Cornwall, Isle of Wight, Kent. 



