No book to date focuses solely on the Pacifica Iris - the Californicae Series, of the Apogon Section, in the Subgenus Limniris. However many books on the genus Iris do include sections or chapters on Pacific Coast Native Iris. The following list includes some of those that mention the series Californicae, together with at least some of the species within this series.
Austin, Claire. 2005. Irises: A Gardener's Encyclopedia. Timber Press, 339 pages.
Dykes, W. R. 1913. The Genus Iris. Cambridge University Press.
Dykes, W. R. 1924. A Handbook of Garden Iris. Hopkinson, London.
Harlow, Nora and Jacob, Kristin, editors. 2003. Wild Lilies, Irises and Grasses: Gardening with California Monocots. University of California Press, 274 pages.
Mathew, B. 1989. The Iris. London: Batsford Ltd., 202 pages.
McGeorge, Pamela and Nicoll, Alison. 2001. Irises. Firefly Books, 96 pages.
Mitchell, Sydney B. 1960. Iris for Every Garden. M. Barrow & Co, Inc, New York, 216 pages.
Shear, William. 2002. The Gardener's Iris Book. Taunton Press, 169 pages.
SIGNA. 2006. SIGNA Checklist of Iris. Published by Species Iris Group of North America; contact SIGNA to purchase. Includes species list and cultivars list. For more information, see http://www.signa.org/index.pl?Checklist.
Species Iris Group of British Iris Society. 1997. A Guide to Species Irises. Cambridge University Press, 371 pages.
Warburton, Beatrice and Hamblin, Melba, editors. 1978. The World of Irises. American Iris Society, 494 pages. Published by the American Iris Society.