4. CRUCIFER^. 153 



Range of mean annual temperature 51 — 48. 



Colonist. Agi-estal or Viatical. Under suspicion of 

 having been originally an alien, introduced by human 

 agency ; and though diffused over a great part of the is- 

 land, as shown by the indicated provincial area, its locali- 

 ties are mostly suspicious or micertain. It appears to be 

 completely established in the provinces of Thames and 

 Ouse ; but those of the Peninsula and Channel are less sa- 

 tisfactory ; and north and west from these four, the remain- 

 ing provinces can be indicated for the plant only as an im- 

 perfectly established alien. I have occasionally seen it 

 plentiful in ploughed fields, in Smrey ; but more usually it 

 is met with on wastes and by road-sides. While the South 

 Western railway was in process of fonnatiou, across that 

 county, this plant was abundant on and about the embank- 

 ment, in many spots ; thus making a chain or series of lo- 

 calities for several miles. Apparently the seeds remain 

 buried many years without losing their capability of vege- 

 tating. 



4r/) A"/ -^ 106. Erysimum virgatum. Roth. 



Area (1). 



Alien. " In the neighbourhood of Bath, the place of 

 Eiysimmn cheiranthoides is supplied by this plant." — C. 

 C. Babington, in Phytol. Vol. i. page 310. "Bath, quite 

 as good a native as E. cheiranthoides." — C. C. Babington, 

 MS. This is all the information which I have about the 

 occurrence of this plant in England ; but it seems not un- 

 likely that other localities which have been assigned to the 

 better known species, may really belong to this one : they 

 are closely alike, though readily distinguishable while in 

 fiiictification. As E. cheiranthoides only is mentioned in 



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