136 4. CRUCIFER/E. 



" Myagrum orientale." 

 " Myagrum paniculatum." 



Clypeola Jonthlaspi, Linn. 



Vella annua, Linn. 



Incognits. These four have been reported as British, 

 but on authority which seems to entitle them to rank only 

 in the " incognito " class of citizensliip. The two first are 

 enumerated in Don's list of Forfarshire plants. I have mis- 

 laid my reference to the third, but think it may have been 

 mentioned in a Ust of British species, wanted by Mr. Sow- 

 erby, for the Supplement to ' English Botany,' and the 

 name occurs in the list of " excluded species," on the co- 

 ver of the 'London Catalogue.' The fomlh was supposed 

 to have been found " on Salisbury Plain, not far from 

 Stonehenge," by Mr. Lawson ; and on faith of this supposi- 

 tion, it has been retained in om* Floras of Britain several 

 scores of years : so slow is the progress of con-ection where 

 positive errors can be met only by negative disproof 



83. Dentaria bulbifera, Linn. 



Area ^ -2 3 ********* 13 [14 15]. 



South limit in Sussex. 



North limit in Ayrshire. 



Estimate of pro\inces 3. Estimate of comities 6. 



Latitude 51 — 56. ' Local type of distribution. 



Agrarian region. Inferagi-arian — Midagrarian zones. 



Descends to ? 



Ascends to } 



Range of mean annual temperature (49 — 47 ?) 



