Part I. Floristic plant geography. Relation between dissemination and migration ; Evidences of the dynamic character of ranges ; Causes of migration ; Dissemination efficiency ; Migratory routes ; Barriers to migration ; Some consequences of migration ; Endemism and Its Interpretation ; Interrelations among floristic plant geography, taxonomy, and geology -- Part II. Ecologic plant geography. Introduction ; Evolution of North American vegetation ; South American vegetational history ; The tundra region ; The subarctic-subalpine forest region ; The temperate mesophytic forest region ; Forests of temperate affinity in Middle America ; The temperate xerophytic forest region ; The chaparral region ; The steppe region ; The desert region ; Some significant features of tropical climates ; The microphyllous woodland region ; The tropical savanna region ; Tropical xerophytic (seasonal) forest region ; The tropical mesophytic forest (rain forest) region ; Tropical alpine region ; Vegetation in relation to climatic classification ; Marine vegetation.
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Describes and interprets the natural vegetation of North America and its development through time.