I'm not entirely sold on the idea of Rosa canina

, though wouldn't argue - but agree with the other species mentioned - and as for the butterfly, most such depictions on glass are stylized and not intended to represent an actual species. In this instance it's just possible that with those 'eyes' then maybe the artist was thinking of a peacock.
I'm obviously always going to have a problem with opalescent versus opaline, and now I see we have opalescent combined with opaline - heavens where will all this end

But this mustn't detract from a gorgeous piece of glass.