164 4. CRUCIFER^. 



* * ' 

 121. SiNAPIS MURALIS, Br. ^ ^^. /// . /^ ,0 ^/ 



Area 1 2 3 4 5 6 * * [9] ^ (11 . . . 15). 



South limit in Dorset, Sussex, Kent. i^i>i^c^o-^ 



North limit near Bungay, Bristol, (Swansea?). 



Estimate of provinces 6. Estimate of counties 12. 



Latitude 50 — 53. English type of distribution. 



Agrarian region. Inferagrarian zone. 



Descends to the coast level, in the Channel. 



Ascends to 50 or 100 yards, in England. 



Range of mean annual temperature 51 — 49. 



Denizen. Viatical and Glareal. The present species 

 is plentiftd, and apparently indigenous, along both sides of 

 the Thames, for several miles above London. Through 

 the Botanical Society of London I have received speci- 

 mens, collected in the vicinity of Bungay, by Mr. Stock, 

 and near Bristol, by the Rev. T. Butler and others. For 

 other localities in the southern provinces, I rely upon the 

 eyes of other botanists. Hudson's " Brassica muralis " in- 

 cludes both this and S. tenuifolia; and his locality of 

 " Chester walls " belongs to the latter only. Winch con- 

 siders the "muralis" introduced to the ballast hills of 

 Tyne ; and the Fifeshire locality, from which I am favour- 

 ed with specimens by Mr. Brand, is allowed by himself 

 and other Edinbm'gh botanists, to have equally had its ori- 

 gin in ballast carried thither. 



122. SiNAPIS MONENSIS, Bob. 



Area * * * * * 6 7 * 9 ,-}, ^ 12 13 * [15] 16. 

 South limit in Glamorganshire. 

 North limit in Skye or Bute. 



