184 MR. GEORGE S. BOULGER ON THE DISTRIBUTION OT 



Dr. Hooker, in his * Student's Tlora/ gives its general distribu- 



Middle 



West 



Oxfordshire and Gloucestershire." Mr 



Watson, in the ' Cjbele Britannica ' (1846, vol. i. p. 118), writes 

 of it as follows : — " South limit in Oxfordshire and Grloucester- 

 shire. North limit in the same countries. Estimate of provinces 2. 

 Estimate of counties 2, Latitude 51°-52^. Local type of dis- 

 tribution. Agrarian region. Inferagrarian zone. Descends to ^ 



? Ascends to -? Eangeof temperature (48°) ? Native. 



Eupestral ? An extremely local plant, the area of which has been 



?xtended through misapplications of the name. Apparently 



greatly 



it is quite limited to the two adjoining counties indicated.'^ 



The reference here is to an erroneous record of the plant in the 

 north of England. 



"But," Watson continues, "the dividing line between those 

 counties being also the dividing line between the eastern province 

 of Thames and the western province of Severn, the species will 

 stand proportionably higher in a provincial census than in one 

 founded on counties. I cannot state anything exactly concern- 

 ing the altitude or local situations in which this Thlaspi is found, 

 and am consequently uncertain as to the temperature.'' 



There are no specimens of the species in Dr. S. P. AYoodward's 

 Herbarium, now at the Cirencester Agricultural College, which 

 was collected just before the publication of the ' Cybele.' I am not 

 aware what other localities may have been recorded in Oxford- 

 shire ; but, I believe, Burford, only two miles from the Glouces- 

 tershire border, was always considered the most important. I 

 have not heard of its occurrence there of late years. 



Some years ago Professor Buckman, E.L.S., found the species, 

 for several successive seasons, a little to the south-west of the 

 village of Sapperton, in Grloucestershire, by the side of a road 

 leading dow^n the Sapperton branch of the great Stroud valley, 

 the escarpment of the Great Oolite. This locality is just within 

 the Severn drainage-area, and about a mile from one I shall men- 

 tion presently. I visited it in vain last year. 



In 1868 or '69 Professor Thiselton Dyer found the species about 

 300 yards west of the Tetbury-Eoad Station, well known to geo- 

 logists for the interesting local patch of Bradford Clay. The 

 plant was there growing on the side of the railway-embankment, 

 on pure limestone. Professor Dyer described the locality and 



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