THE SUPPLY OF water to Southern California seems to be drying up as more people move in, supplies from other areas are in question, rainfall is unpredictable, and the cost of water is rising steadily. All are good reasons for planting a drought-tolerant landscape. Perry, a landscape architect and instructor at California State Polytechnic University, Pomona, has assembled a large collection of plants, including many natives, that will not only survive with little water but also flourish and look good; less water does not mean less beauty. Many color photographs illustrate individual plants and, in many cases, the plant as part of a landscape. This is an excellent reference for a professional or a homeowner who wants to plant a garden in harmony with our climate.