Calochortus umbellatus is a flowering plant in the lily family found only in California in the United States.Wood, Alphonso 1868. Proceedings of the Academy of Natural Sciences of Philadelphia 20(6): 168Tropicos, Calochortus umbellatus Alph. Wood The common name for this species is Oakland mariposa lily or Oakland star-tulip.
Distribution The species is a California endemic of limited distribution.Jepson Manual (1993) published by the University of California, Berkeley It grows primarily in the San Francisco Bay Region, often on serpentine soils, with a few isolated populations in Humboldt, Mendocino, and Nevada Counties.Calflora taxon report, University of California @ Berkeley, Calochortus umbellatus Wood Oakland mariposa lily, Oakland star tulip
Description Calochortus umbellatus is a branching perennial herb up to 25 cm tall. Inflorescence is sub-umbellate with 3-10 white or pale pink flowers.Flora of North America, Vol. 26 Page 127 Oakland star-tulip Calochortus umbellatus Alph. Wood
This species is included on the California Native Plant Society list 4.2 of rare and endangered plants.Calflora (2008) Calochortus umbellatus
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