In the already fo often cited Pallafian Herbarium, at Mr. 

 A.B.Lambert's, there are many fpecimens ofi verticil! at a 

 {Willd. Sp. PL 2. 91) under the name of altaica % collected 

 in afiatic Ruffia and fouthern Siberia ; in thefe we find fo 

 clofe a refemblance to imperialis, that we ftrongly fufpeft that 

 they are but one and the fame fpecies ; and that the differences, 

 which chiefly confift in the number and fize of the flowers and 

 leaves, have been merely produced by culture ; in verticillata, 

 however, the foliage is whorled and very regularly fo, which 

 is only partially and very inconftantly the cafe in imperialis, G. 



