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Calochortus umbellatus is a rare wildflower endemic to California and restricted to a very narrow range of occurrence. The taxon is characteristically found in open chaparral or woodlands, most typically on serpentine substrate soils. The occurrence is further limited to the southern portions of the Outer North Coast Ranges and the San Francisco Bay Area. coun ties of chief occurrence are Marin, San Mateo, Santa Clara, Alameda and Contra Costa. The Oakland Mariposa Lily appears on the California Native Plant Society list 4.2 of rare and endangered plants. The distribution is restricted to elevations between 100 to 700 meters.


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Supplier: C. Michael Hogan

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