4. CRUCIFERiE. 149 



101. Nasturtium amphibium, Br. 



Area 12345**89 10 (11) * 13 14 [15]. 



South limit in Devon, Sussex, Kent. 



North limit in Edinburgh and' Lanark sliires. 



Estimate of provinces 12. Estimate of counties 40. 



Latitude 50 — 56. English type of distribution. 



Agrarian region. Inferagi'arian — Midagrarian zones. 



Descends nearly to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 51 — 47. 



Native. Paludal. Not a common plant ; although enu- 

 merated in seventeen of the twenty local Floras, used as 

 the test of comparative frequency, by the compilers of the 

 'London Catalogue.' But as it appears not Ukely to be 

 absent fiom the whole of Wales and the provinces of the 

 Tyne and Lakes, I have ventured to add two of these four 

 provinces to the number of ten apparently well ascertained. 

 The Scottish localities rest on old or slight authority ; but 

 I let them pass muster on finding the species recognized 

 as a native near Edinburgh, in the Catalogue published for 

 the Botanical Society of that city. The pro%'ince of Tyne 

 (11) is enclosed because the place of its growth is given as 

 on " ballast hills " only, and remains unconfirmed by re- 

 cent obsei-vers. The name is marked in a list checked off 

 for Alvah, in Banffshire ; which, I fear, wUl prove an enor. 



102. Sisymbrium officinale, Linn. 



Area, general. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Orkney, Hebrides, Sutherland. 



