(2013)  Page(s) 168.  
 
Suppose, intitially, we regards R. hugonis as a form of R. xanthina. The variety Canary Bird on this basis arises from within R. xanthina the view taken by Philips and Rix (1993). If however they are regarded as separate species  (Beales 1997) then Canary Bird is an interspecific hybrid R. hugonis x R. xanthina. (Unless seeds were harvested from one of these parents and grown on, not only the parentage but the direction of cross is also an inference.)

(2013)  Page(s) 168.  
 
A similar problem arises with a rose which, for simplicity, will be referred to intially as Cantabrigiensis. This very attractive clear yellow single rose originated as a seedling in the Cambridge University botanic garden and was recognised in 1931. On the basis of its morphology its putative parents were thought to be R. hugonis and R. sericea so that it could be referred to as R. x cantabrigiensis. Austin (1988) refers to it as R. pteragonis Cantabrigiensis. Matters fall into place if we regard R. pteragonis as itself a hybrid, R. hugonis X R. sericea, and refer to it more informatively as R. x pteragonis.

(2013)  Page(s) 165.  
 
Ogisu (1996) has provided an accessible treatment of roses in China's traditional horticulture. Records of rose growing are known from the sixth century A.D. and from the Song and Ming Dynasties. The Koushin rose, apparently recurrent flowering, had arrived in Japan by either the Sui or Tang dynasties, more than 1000 years ago. 

(2013)  Page(s) 168.  
 
A similar problem arises with a rose which, for simplicity, will be referred to intially as Cantabrigiensis. This very attractive clear yellow single rose originated as a seedling in the Cambridge University botanic garden and was recognised in 1931. On the basis of its morphology its putative parents were thought to be R. hugonis and R. sericea so that it could be referred to as R. x cantabrigiensis. Austin (1988) refers to it as R. pteragonis Cantabrigiensis. Matters fall into place if we regard R. pteragonis as itself a hybrid, R. hugonis X R. sericea, and refer to it more informatively as R. x pteragonis.