There is a discussion of two Fritillarias, in the Credos of Spain, tentatively referd to as F lusitanica and F hispanica, in the Alpine Garden Society Journal 1966 volume 34 page 176, with a photograph on page 184.one is found on acid soil, the other on alkaline. leaf , stem, flower and bulb differences are mentioned there are also references on page 161 vol 33, Peter (UK) > >