Jane, I over-simplified my description of p.3-47 in Chapter 3 'Classification of Narcissus' by Brian Mathew in the book 'Narcussus and Daffodil: The genus Narcissus' Ed. Gordon R. Hanks, 2002. Certainly it is not a complete "monograph" but it does give one-sentence descriptions of species and varieties of those species. It is not just to section level. It does give one to a few paragraphs describing each section. To give an idea, on page 37 for N. longispathus, in Group B of Section Pseudonarcissus, "N. longispathus Pugsley. Tall with up to three usually wholly yellow flowers per umbel; spathes very conspicuous, to 10 cm long. South-eastern Spain." I was just saying that is just one small chapter of a book, with few photos. - Gastil