Calochortus umbellatus is a flowering plant in the lily family found only in California in the United States.[3][4] The common name for this species is Oakland mariposa lily or Oakland star-tulip.

Distribution

The species is a California endemic of limited distribution.[5] It grows primarily in the San Francisco Bay Region, often on serpentine soils,[6] with a few isolated populations in Humboldt, Mendocino, and Nevada Counties.[7]

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.[8]

This species is included on the California Native Plant Society list 4.2 of rare and endangered plants.[9]

References

  1. ^ "NatureServe Explorer - Calochortus umbellatus". NatureServe Explorer Calochortus umbellatus. NatureServe. 2022-05-30. Retrieved 30 May 2022.
  2. ^ Kew World Checklist of Selected Plant Families
  3. ^ Wood, Alphonso 1868. Proceedings of the Academy of Natural Sciences of Philadelphia 20(6): 168
  4. ^ Tropicos, Calochortus umbellatus Alph. Wood
  5. ^ Jepson Manual (1993) published by the University of California, Berkeley
  6. ^ "The Jepson Herbarium".
  7. ^ Calflora taxon report, University of California @ Berkeley, Calochortus umbellatus Wood Oakland mariposa lily, Oakland star tulip
  8. ^ Flora of North America, Vol. 26 Page 127 Oakland star-tulip Calochortus umbellatus Alph. Wood
  9. ^ Calflora (2008) Calochortus umbellatus