150 4. CRUCIFERiE. 



Estimate of provinces 18. Estimate of counties 81. 



Latitude 50 — 60. British t3^e of distribution. 



Agi'arian region. Inferagrarian — Superagi'arian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperatiu'e 52 — 46. 



Native. Viatical and Agi-estal. Even this common 

 weed has its limits with us, decidedly in altitude, and ap- 

 parently in latitude. The name occm-s in all the local 

 floras, with the exception of that for Shetland. I find it 

 noted in my list of plants seen about the towns of Dum- 

 barton, Stirling, Perth and Inverness ; as also in those for 

 tracts on the east coasts of Ross-shire and Sutherland. 

 But it is absent fi-om the lists of species observed at Loch- 

 eamhead, Killin, Dalnacardoch, Glen Shee, Clova, Cas- 

 tletown, Dalwhinnie, Locheil and the north coast of 

 Sutherland. Balfour and Babington admit it among the 

 plants of the Hebrides, and it is enumerated in Dr. Gillie's 

 manuscript Flora of Orkney, on faith of Lowe's list ; pos- 

 sibly introduced to both these gi'oups of Isles. In the 

 county estimate, however, I ventm-e to exclude only Shet- 

 land. 



103. Sisymbrium Irio, Linn. 



Area [1] * 3 4 [5 * * 8] * * * ^ * 14. U jfti. lU.fi^^k 

 South limit near London and Oxford. 

 North limit at Berwick on Tweed. 

 Estimate of provinces 3. Estimate of counties 7. 

 Latitude 51 — 56. Local type of distribution. 

 Agraiian region. Inferagrarian — Midagi'aiian zones. 

 Descends to the coast level, in Thames province. 

 Ascends very Httle above the coast level, say 50 yards ? 

 Range of mean annual temperature 49 — 48. 



