Article (magazine)  (2011)  Page(s) 50.  
 
During his 36 years of breeding activity in the Nikita Botanical Garden Gartvisom was created about 100 domestic varieties of garden roses. Some varieties, he devoted ....to a variety of places - ...Tenistaja Riga (Ombre de Riga)...

Article (website)  (2001)  
 
The rose catalogue of 1834 includes 210 classes and varieties....The largest group is those of R. gallica....Like every man who loves his country, Gartvis did not forget it while living in Crimea. It is no chance that varieties of R. gallica are named Несравненная Ливония (Incomparable de Livonia), Прекрасная Рига(Belle de Riga), Тенистая Рига (Ombre de Riga), Темно-бриллиантовая Ливония (Foncée-brillante de Livonia).