[Wikipedia] Limited Range, Habitat, Endangered: Fritillaria liliacea, the fragrant fritillary, is a threatened bulbous herbaceous perennial plant in the lily family Liliaceae. It is native to the region surrounding San Francisco Bay in California, USA. F. liliacea prefers heavy soils including clays; for example, andesitic and basaltic soils derived from the Sonoma Volcanic soil layers are suitable substrate for this species. Distribution The range of this wildflower is over parts of southwestern Northern California, United States, especially Solano and Sonoma counties and at coastal locations south to Monterey County; occurrence is typically in open hilly grasslands at altitudes less than 200 meters in elevation. This California endemic has been a candidate for listing as a U.S. federally endangered species, and some of the remaining fragmented colonies are at risk of local extinction, such that the species is considered locally endangered. Example occurrences are: Edgewood Park in San Mateo County and the Sonoma Mountains foothills in Sonoma County. Examples of highly fragmented or extirpated colonies are in San Francisco due to urban development. (link added by Mary Ann Machi)