Newsletter  (Jul 2012)  Page(s) 44-45.  
 
p. 44: Among the varieties of his [Michurin's] selection (Noble, Buketnaya, Bicolorous, Zarya Vostoka, Sister of Dawn, Brother of Dawn, Double White, Kerb Pink, Kerb White, Lawny, Mother of blue, Mother of yellow, Mother of climbing, Svetlana, Tatyana Michurina, N.I. Kichunov, Neptune, Prince of Varangians, Prince Rurik, Cream, Fairy, Tsarina of Light, Ceres, etc.), many carried the genes of this species [Rosa rugosa].

p. 45: Prince of Varangians Origins: R. rugosa Comte d’Eprem × R. bifera Souven de William Wood. “bud is long, black-slate-red; big semi-double blooms. Of beautiful velvety dark-red colour scheme not found in R. rugosa. Blooms not so readily.