Heath, Brent, and Becky Heath. Daffodils for American Gardens. Washington, D.C.: Elliott and Clark, 1995. Discusses and illustrates daffodils thoroughly and clearly. Includes illustrations, bibliography, and index.
Heywood, Vernon H., ed. Flowering Plants of the World. New York: Oxford University Press, 1993. Discusses many flowering plants, including morphology, growth, and disease. Illustrated; includes bibliography and index.
McRae, Edward A. Lilies: A Guide for Growers and Collectors. Portland, Oreg.: Timber Press, 1998. Discusses lily issues, including cultivation, species, diseases, and hybridizing. Illustrated; includes glossary, bibliography, and index.
Mattock, John, ed. The Complete Book of Roses. London: Ward Kock, 1994. Describes many roses, their morphology, cultivation, diseases, hybrids. Illustrated; includes bibliography, index.
Pavord, Anna. The Tulip. New York: Bloomsbury, 1999. Covers many aspects of tulip history, morphology, cultivation, and hybridization. Illustrated; includes bibliography, index.
Stebbings, Geoff. The Gardener's Guide to Growing Irises. Portland, Oreg.: Timber Press, 1997. Discusses iris types, cultivation, species, and hybridization. Illustrated; includes glossary, bibliography, and index.
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