Whats unifying them, is often contents as aluminium..or calc.., the contents of cadmium, unifies cann i, with the solanaceas, as alumina does in solanaceas..
I belive raunuculus, is calc.. and closest is prob calc, and mercurius.
remedies to look at, closest in action to ran, is Dulcamara,Bryonia ( wewe duscussed bry before as you would recall, a good option)Mezereum, also possible..very possibl indeed, and Sulphur..and cact, Cimicifuga+pulsatilla.is equal followers of ran.