The life cycle of the Morro blue butterfly is associated with a single host plant, the dune lupine, where the species finds shelter, feeds and lays eggs. Its range is limited to a narrow strip of coastal dunes that have been significantly impacted by development and degradation.
References and resources
 W. T. Williams and J. R. Potter: The coastal strand community at Morro Bay State Park, California. Bulletin of the Torrey Botanical Club July-August 1972, 99 (4), pp. 163-171. Abstract.
 California Coastal Commission: California's Coastal Sand Dunes.
 ZipcodeZoo.com: Icaricia icarioides moroensis.