■4. CRUCIFER.E. 119 



exact, concerning the altitude or local situations, in which 

 this Thlaspi is found, and am consequently uncertain also 

 as to the temperature. T. alpestre was the species intended 

 under the name of this one, in the Botanist's Guide and 

 earlier works, refening to the localities in the Hiunber and 

 Lake provinces. 



62. Thlaspi alpestre, Linn. 



Area 1 * [3] * * 6 7 8 * 10 11 12 * * 15. 

 t^- '^^. South limit in Devon -and Derbyshii'e. 



^ North hmit in Cumberland and Forfarshire. 



Estimate of provinces 8. Estimate of counties 12. 



Latitude 50 — 57. Highland (?) type of distribution. 



A. A. regions. Midagi-arian — Midaictic zones. 



Descends to ? (Say, to 150 or 200 yards, in England.) 



Ascends to ? (Say, about 800 yards, in Scotland.) 



Range of mean annual temperatm^e 47 — 40. 



Native. Rupestral. Though suggestively assigned to the 

 Highland type, as a plant ascending high on the Gram- 

 pians, and in England affecting the hilly coimties almost 

 exclusively ; yet this species is reaUy very scarce in the 

 Highland provinces, and runs more southward than other 

 plants assigned to the same type. Its chief prevalence ap- 

 pears to be on the hmestone hills of the north of England, 

 where its 'rupestral' character passes almost into the 'pas- 

 cual.' In Wales, according to the late Mr. J. E. Bowman, 

 it ascends into the lower arctic zone ; and I suppose the 

 locality in Glen Isla, Forfarshire, to be within the midai'ctic 

 zone. Possibly, the range of temperatm-e runs both higher 

 and lower than the degrees indicated; certainly lower, if 

 the altitude of 800 yards is exceeded in Scotland. The 

 Thames province is indicated [3] merely because the Ox- 



