Habitat and Status Surveys for the Endangered Smith’s Blue Butterfly at Rancho San Carlos in Carmel Valley, California

Results of surveys for buckwheat (Eriogonum) and Smith’s blue butterfly (Euphilotes enoptes smithi). Observations of the related Tilden’s blue (E. e. tildeni). Data for transects used to estimate relative abundance of Smith’s blue. Vegetation, area, slope, aspect, elevation, soils/rocks for locations where buckwheat or Smith’s blue was found. Estimated numbers of buckwheat of all three species at each location, with dates of flowering. Results of surveys for Smith’s blue and Tilden’s blue. Smith’s blue data from transects sorted by sex and behavior. Indices of relative abundance for each transect. Map showing Smith’s blue habitat, buckwheat stands, and Smith’s blue and Tilden’s blue observations.