The American Daffodil Society maintains an Approved List of Miniature Daffodil Cultivars. A Committee reviews new cultivars to decide whether the size is compatible with the size of those on the list. Grace is an important consideration.
Peter R. Barr
Alec Gray
“Miniature Daffodils,” Alec Gray, lecture to the RHS on April 16, 1946
“Miniature Daffodils,” Alec Gray, 1955 (not his book)
“Small Hybrid Daffodils,” Alec Gray, 1965, Journal of the RHS
Douglas Blanchard
“Some Dwarf Daffodils in the Cold House,” Douglas Blanchard, AGS Bulletin, March 1957
“Miniature Daffodils,” Douglas Blanchard; lecture given to the RHS, Apr 14 1959, Journal of the RHS
Roberta Watrous
“Miniature Daffodils,” Roberta Watrous, The Garden Journal, NY Botanical Garden, Sep-Oct 1958
“Miniature Daffodils,” Roberta Watrous, RHS Yearbook 1960
“Miniature Daffodils,” Roberta Watrous, RHS Daffodils 1973
Additional
“Hybrids of Smaller Daffodils,” W.M. Thomson; Journal of the Royal NZ Inst. of Hort, 1942
“Miniature Daffodils,” 1963, ADS Committee report
“Miniature Daffodils,” George Lee, American Horticulture Magazine, Jan 1964
“A miniature world of daffodils,” by Warren Boyles, Forty South, 2004 (about Rod Barwick)
“Symposium on Miniature Daffodils,” Mary Lou Gripshover; RHS Daffodil Yearbook, 2009
“Keira Bulbs,” Graham and Helen Fleming, Bulletin of The Horticultural Society of Canberra, 2013
“Little wonders: Alan Titchmarsh on growing dwarf narcissi,” The Express, London, Sept. 3, 2016
“Exploring Bulbocodiums,” a PowerPoint program by Lawrence Trevanion of Kaleen, Australia