156 4. CRUCIFERiE. 



na grows on Compton Cliffs, imcler the wild, elevated tract 

 of Afton Down, which is inhabited by sheep alone. It is 

 veiy plentiful on the bare, perpendicular face of the chalk 

 rock, forming bushes of two feet high, with thick, woody 

 stems, sometimes as thick as the wiist, and lasting several 



years." " Its other station is on a kind of soft, 



sandy rock, by the shore at Steep Hill, and some miles 

 distant from the Freshwater locality. In both there is no- 

 tliing to indicate a suspicion of the plant's having escaped 

 from cultivation." With this information before me, I 

 cannot continue to refer the Matthiola incana to the alien 

 class, and yet confess some hesitation in admitting it to be 

 a native of Britain ; the denizen is a convenient neutral or 

 intermediate category for plants thus in the balance. 



111. Matthiola sinuata, Br. 



• Area 1 [2] * * * 6 7. 



South limit in Cornwall and Devon. 



North limit in Anglesea and Flintshire. 



Estimate of provinces 3. Estimate of counties 10. 



Latitude 50 — 54. Atlantic type, of distribution. 



Agi'arian region. Inferagrarian zone. 



Descends to the coast level, in the Peninsula. 



Ascends, on the coast level, to North Wales. 



Range of mean annual temperature 52 — 49. 



Native. Littoral. Reported to occur on the coasts of 

 Cornwall, Devon, Glamorgan, Pembroke, Merioneth, Caer- 

 nai-von, Anglesea and Flint. The coast of Sussex has also 

 been indicated, but possibly some mistake has occmTed 

 between this species and M. incana ; tlie alleged localities 

 for the two species, by different observers, being both near 

 Hastings. I have ventm'ed to add two to the ascertained 



