(2005)  Page(s) 396.  
 
Our data suggest that R. rousseauiorum and R. williamsii cannot be considered as species distinct from R. blanda. Here we consider species to be ecologically, morphologically and (or) genetically cohesive groups of populations that evolve independently from other such groups. [Our analysis] suggests most of the genetic variation occurs within rather than among R. blanda segregates. ...Despite intensive collecting in the regions where R. rousseauiorum and R. williamsii are endemic, few specimens could be unambiguously identified as belonging to either of those two taxa. Doubts have long persisted in the botanical community regarding the species status of R. rouseauiorum and R. williamsii, as well as that of R. johannensis and R. sublanda. ...[they track all the botanical discussions]

R. rousseauiorum and R. williamsii are distinguished from R. blanda by the presence of a large number of glandular trichomes on the lower surface of the stipules.....Although our sampling for these other taxa [ R. johannensis and R. subblanda] is limited, our survey of molecular markers in specimens from Quebec strongly suggests that on both molecular and morphological grounds, R. blanda should not be subdivided into several different species. "