Abstract
Three hundred and forty eight vascular plant taxa were documented for Aztec Ruins National Monument, San Juan County, New Mexico. These include 13 new records for San Juan County, New Mexico. New records for Aztec Ruins National Monument include Sclerocactus cloveriae K. Heil subspecies cloveriae. This work was part of a biological inventory throughout the National Park Service as part of the Natural Resource Challenge, a legislative and administrative mandate.