12. CARYOPHYLLACEiE. 233 



num, and that of Shetland is treated below under name of 

 C. nigrescens. 



197,b. Cerastidm nigrescens, Edmonsi. 



Ai'ea i^^^^^j)i^;)fj^*^^i(j^j^^^l8. 



South and North limit in Shetland. 



Estimate of provinces 1. Estimate of counties 1. 



Latitude 60 — 61. Local type of distribution. 



Arctic region. Inferarctic zone. 



Descends to 100 or 50 yards in Shetland. 



Ascends to ? 



Range of mean annual temperature, say 46. ^T- 0^ /^ y^.///. /f. J^V 



Native. Rupestral or Glareal. " Abundant on loose 

 serpentine gravel, near Baltasound, Unst, growing with 

 Arenaria norvegica and Aralis petraea." . . . . " I should 

 imagine that they descend to within 200 feet of the level of 

 the sea." (Flora of Shetland). This agrees with C. latifo- 

 lium in flower, fruit, and seed ; but differs much in foliage ; 

 and the differences remain quite as strong in the plants 

 raised from seeds near London. I therefore describe its 

 distribution apart from that of C. latifolium, though still in- 

 clining to hold it a variety of the Linnean species. See 

 the subject discussed in ' Phytologist,' vol i. pp. 497, 586, 

 677, 717 ; but Mr. Edmondston's figures (497) are inexact, 

 and worse than useless. 



BuFONiA TENUiFOLiA, Linn. 



Area * ^(. [3 * * * * 8]. 



Incognit. Said to have been formerly found on Houns- 



2 H 



