<P> Plants are grouped into floras based on region (floristic regions), period, special environment, or climate . Regions can be distinct habitats like mountain vs. flatland . Floras can mean plant life of a historic era as in fossil flora . Lastly, floras may be subdivided by special environments: </P> <Ul> <Li> Native flora . The native and indigenous flora of an area . </Li> <Li> Agricultural and horticultural flora (garden flora). The plants that are deliberately grown by humans . </Li> <Li> Weed flora . Traditionally this classification was applied to plants regarded as undesirable, and studied in efforts to control or eradicate them . Today the designation is less often used as a classification of plant life, since it includes three different types of plants: weedy species, invasive species (that may or may not be weedy), and native and introduced non-weedy species that are agriculturally undesirable . Many native plants previously considered weeds have been shown to be beneficial or even necessary to various ecosystems . </Li> </Ul> <Li> Native flora . The native and indigenous flora of an area . </Li> <Li> Agricultural and horticultural flora (garden flora). The plants that are deliberately grown by humans . </Li>

Flora and funa of all types of forests