This work describes ten distinctive areas according to their floristic composition and physiognomic characteristics. Based on INEGI's map of land management as well as on the interpretation of aerial photographs and field data, INEGI's map showed only eight plant associations, we added two more plant associations, the sarcocaulecent desert and the coast vegetation, were added. The term "areas without apparent vegetation" was substituted by erial. This work presents a checklist of 447 vascular plant species out of 62 can be founded in San Ignacio lagoon area.

One hundred and twenty plants species were collected on the dunes along the 1400 Km-long western coast of the peninsula of Baja California, México. At sixteen of the thirty-two sampled locations between Tijuana, B.C. and La Paz, B.C.S., transects were made at right angles to the shore to record cover and zonation of these species. Abronia maritima, was found along the entire coast and it was the major foredune-builder throughout most of its range. The ranges of most of the others species fall into one of the three groups corresponding to regions of inland vegetation and to Köppen climatic types of semi-arid (BS) south to 30°N, arid (BW) in the central part, and aris tropical (BSh) south of 30°N. Within each region the vegetation on dunes inmediately above the beach is more uniform than that on the backdunes, where the shrubby vegetation varies acording to the degree of surface stabilization.

The objetive of this paper is to summarize, mainly through a review of the literature, beach vegetation and its phytogeography along the Pacific Coast of North America between Point Barrow, Alaska (approximately 71°N),and Cabo San Lucas, at the southern tip of Baja california (approximately 23°S). The survey of beach vegetation does not include species of adjacent habitats such as dunes, ocean-facing cliffs, saltmarshes, shingle beaches and the intertidal unless those species are also characteristic of beach vegetation. Most of the information summarized in this section comes from floras. Show in a table a list of 46 species with some subspecies, showing latitudinal ranges and distribution patterns for the characteristic beach species of the North American Pacific Coast.

This book discussed and describes over 550 plants, includes over 275 pictures of them. Most native trees and larger woody shrubs are included and also common widespread or prominent woody shrubs, vines, herbaceous, endemic plants are also described.