Hey Jacquie,
I went on-line and this is what I found:
Star jasmine= J. multiflorum
Royal jasmine=J. grandiflorum
aka Catalonian or Spanish jasmine and this is the one which is used most often to make perfume and that its
fragrance is most pronounced in August and it's then it's harvested.
Arabian Jasmine=the Sambac varieties.
I'll see if I can find pics of them.
Lee