(1991)  Page(s) 644.  
 
in The Chemistry of Rose Pigments by C.H. Eugster and E. Märki-Fischer:
Anthocyanins in Roses. 8.2. Pelarginin in roses. Pelargonin (62; see Fig. 8) did not appear in roses in color-determining concentrations until 1929. In other garden plants, such as pelargoniums and geraniums, it had been known for years. However, analysis shows that pelargonin is hardly ever formed on its own, but is accompanied in almost all scarlet roses by cyanin (66). 'Gloria Mundi' is one of the very few roses that contains almost pure pelargonin (Fig. 8).

(1991)  Page(s) 666.  
 
in The Chemistry of Rose Pigments by C.H. Eugster and E. Märki-Fischer: Anthocyanins in Roses. 8.4 Peonin in Roses. ... Pure peonin is not found even in R. rugosa rubra; it is accompanied by much cyanin. The richest source of almost pure peonin is the old shrub rose 'Hansa' (Schaum and Van Tol, 1905; Fig. 11). Its mauve-red flowers show what can be achieved by high levels of pure peonin!