In biology, the science pertaining to the geographical spreading of plants; geobotany: Phytogeography is mainly a descriptive version about plants being either indigenous, or whether they were brought into an area by some means, and where they came from.

A major division of plant science which is concerned with all aspects of the spatial distribution of vegetation: Geographical botany, plant geography, and phytogeography all involve the study of the spatial distributions of plant life and of the environmental relationships which may influence these distributions.

Plant geography has emphasized the mapping of such regions and the interpretation of the terms of environmental (ecological) influences.

The areas of phytogeography and zoogeography do not necessarily exist together in the same place, because there are barriers and factors that affect their growth and arrangements which are often different for plants and for animals.