Book  (2019)  Page(s) 130-131.  Includes photo(s).
 
Natural Hybrids...Rosa luciae Rochebr. et Franch ex Crép. x R. rugosa Thunb. , description

Newsletter  (Nov 2013)  Page(s) 33.  
 
[From "Seizo Suzuki’s collection of old roses and species roses", by Yuki Mikanagi]
In 1942, though Japan had already entered into World War II, Mr. Suzuki was continuing his field work, and found a natural hybrid between R. rugosa and R. multiflora (R. x iwara) near the estuary of the Toyohira River in Hokkaido, and a natural hybrid between R. rugosa and R. luciae (= R. wichurana) on the seashore in Ibaraki Prefecture. In later years, he told me that when he visited the place where he had seen the R. rugosa x R. luciae hybrid, he found the rose had been lost because of sand dredging work in the area.