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The classification and distribution mapping of the vegetation of Canyon de Chelly National Monument (CACH) and surrounding environment was accomplished through a multi-agency effort between 2003 and 2007. The National Park Services Southern Colorado Plateau Network facilitated the team that conducted the work, which comprised the U.S. Geological Survey's Southwest Biological Science Center and Fort Collins Science Center, Navajo Natural Heritage Program, Northern Arizona University, and NatureServe. The project team described 48 plant communities for CACH35 of which were described from quantitative classification based on field-releve data collected in 2004. Five additional plant communities were based on field releves collected in a previous study. The team derived four additional plant communities from field observations during the photointerpretation phase of the project, and field documented them during accuracy assessment. The National Vegetation Classification Standard served as a conceptual framework for assigning these plant communities to the alliance and association level. Ten of the 48 plant communities were designated park specials, that is, plant communities with insufficient data to describe them as new alliances or associations.