Allium sharsmithiae

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Allium sharsmithiae
Scientific classification edit
Kingdom: Plantae
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Amaryllidaceae
Subfamily: Allioideae
Genus: Allium
A. sharsmithiae
Binomial name
Allium sharsmithiae
(Ownbey & Aase ex Traub) McNeal
SynonymsTropicos, Allium fimbriatum var. sharsmithiae Ownbey & Aase ex Traub
  • Allium fimbriatum var. sharsmithae Ownbey & Aase in Munz & Keck 1959, invalid, no Latin description
  • Allium fimbriatum var. sharsmithiae Ownbey & Aase ex Traub 1972

Allium sharsmithiae, called the Mount Hamilton onion or Helen Sharsmith's onion, is a rare species of wild onion endemic to a small region in California. It is found on serpentine soils in the vicinity of Mount Hamilton, in the Diablo Range south of San Francisco Bay in Santa Clara, Alameda and Stanislaus Counties.[1][2][3]

Allium sharsmithiae produces round to egg-shaped bulbs up to 2 cm in diameter. Flowering stalk is round in cross section, not hollow, up to 20 cm tall. Flowers are urn-shaped, up to 2 cm in diameter; tepals deep reddish-purple; anthers and pollen yellow.[1][4][5][6]


  1. ^ a b Flora of North America v 26 p 252, Allium sharsmithiae
  2. ^ BONAP (Biota of North America Project) 2013 county distribution map, Allium sharsmithiae
  3. ^ Calflora taxon report 233, Allium sharsmithiae (Traub) D. McNeal Sharsmith's onion
  4. ^ Hickman, J. C. 1993. The Jepson Manual: Higher Plants of California 1–1400. University of California Press, Berkeley.
  5. ^ McNeal, D. W. 1992. A revision of the Allium fimbriatum (Alliaceae) complex. Aliso 13(3):411–426.
  6. ^ Traub, Hamilton Paul. 1972. Plant Life 28: 64.

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