Rosa canina is less thorny than the common Rosa rubiginosa. The lack of hairs on the stalk of the flower and fruit is a good diagnostic feature. I think the sepals are shorter and less persistent on R. canina but I have not checked any botanical keys for this.
Neither Plantnet nor Vicflora say anything about sepal length. Vicflora states that in canina, the sepals are strongly reflexed (turned back) after flowering, and the sepals of rubiginosa are hardly refexed after flowering, and spiny!
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