Book  (1828)  Page(s) 145.  
 
The author has imported from every country those which are there considered the darkest or blackest, which have all produced flowers, he is consequently able to give his opinions with accuracy. ...next are the Imperial...

Book  (1770)  Page(s) 250.  
 
Imperial Rose. Rosa imperialis. A new Rose raised by Mr. Whirworth of Coventry, advertised last Year at 10 s. 6 d.