Environmental and biotic factors affecting the occurrence of the native bunchgrass Nassella pulchra in California grasslands

California bunchgrass communities are one of the most endangered ecosystem types in the United States. In this study, we sought to determine long-term (52 years) changes in populations of native bunchgrasses, Nassella pulchra (A. Hitchc.) Barkworth and Nassella cernua (Stebb.