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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Ordo: Asparagales

Familia: Amaryllidaceae
Subfamilia: Allioideae
Tribus: Allieae
Genus: Allium
Species: Allium sharsmithiae

Allium sharsmithiae (Ownby & Aase) McNeal

USDA, NRCS. 2006. The PLANTS Database, 6 March 2006 ( Data compiled from various sources by Mark W. Skinner. National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

Vernacular names

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]

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

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