California:

Munz, P.A. (& Keck, D.D.) (1959) A California Flora. Berkeley, Univ. of California

Munz, P.A. (1968) Supplement (to the above)

Idaho:

Davis, R.J. et al. (1952) Flora of Idaho, Dubuque, Idaho, Brown.

Nevada:

Tueller, P.T., Robertson, J.H. & Zamora, B. (1978) The Vegetation of Nevada - A Bibliography. Reno, Nevada, Agricultural Experimental Station, University of Nevada

Oregon:

Peck, M.E. (1961) A Manual of the higher Plants of Oregon. Portland, Binfords and Mort in cooperation with Oregon State University Press, Corvallis

Washington:

Daubenmire, R.F. (1962) Vegetation of the State Washington: A Bibliography. Northw. Sci. 36: 50-54

Wyoming:

Dorn, R.G. (1977) Manual of the vascular Plants of Wyoming. 2 vols. New York, Garland.

Hitchcock, C.L. et al. (1955-1965) Vascular Plants of the Pacific Northwest. 5 Vols. Seattle, Univ. of Washington Press.