This indicator describes rangeland plant communities and their area at any given time, with the difference between times being a reflection of temporal changes. This indicator is the hierarchical subcomponent of the “Extent of Land Area in Rangeland” indicator. Changes in certain plant communities could result in changes in resource outputs, ecosystem services, non-market values, and habitats for plant and animal species. Changes in plant communities over time may suggest changes in underlying environmental factors such as climate and nutrient availability, changes in ecosystem functioning, or changes in disturbances (including grazing).