According to the International Organization of Plant Information and to the International Plant Names Index, Rosa stenodonta (Borbás) Heinr.Braun is a synonym of the Rosa pendulina L., not a legitimate separate taxon. At this point (more than 125 years after this name was proposed) it may possibly be a cultivar of R. pendulina, although I find no record of its existence outside of Roseraie de l'Haÿ or the Loubert Collection.