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Allium howellii (Howell's onion) (5724554963)

Classification System: APG IV

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

Familia: Amaryllidaceae
Subfamilia: Allioideae
Tribus: Allieae
Genus: Allium
Species: Allium howellii
Varietas: A. h. var. clokeyi – A. h. var. howellii – A. h. var. sanbenitense

Allium howellii Eastw.
Native distribution areas:

Continental: Northern America
Regional: Southwestern USA

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition

Eastwood, A., Leafl. W. Bot. 2: 109 1938.
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.
International Plant Names Index. 2017. Allium howellii. Published online. Accessed: Sep-05 2017.
Govaerts, R. et al. 2017. Allium howellii in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2017 Sep 05. Reference page.

Vernacular names
English: Howell's onion

Allium howellii is a North American species of wild onion known by the common name Howell's onion. It is endemic to California.


Allium howellii is a tall onion plant, producing a stem which may exceed half a meter in height from a reddish-brown bulb one to two centimeters long. There is a single cylindrical leaf about as long as the stem. The inflorescence holds up to 100 dark-veined lavender to white flowers, each under a centimeter long.[2][3][4]

Several varieties have been named:[5][6]

Allium howellii var. clokeyi Ownbey & Aase ex Traub[7] - San Bernardino, Los Angeles, Ventura, Santa Barbara counties
Allium howellii var. howellii - Merced, Fresno, Kern, San Luis Obispo counties
Allium howellii var. sanbenitense (Traub) Ownbey & Aase [8] - San Benito County

Distribution and habitat

Howell's onion grows in the granite and serpentine soils of several mountain ranges, hills, and valleys from San Joaquin County to San Bernardino County.[9][10][6][11]

"NatureServe Explorer 2.0".
Flora of North America Allium howellii
Jepson Manual Treatment
USDA Plants Profile
Kew World Checklist of Selected Plant Families
Calflora Consortium of California Herbaria Taxon Report 199 , Allium howellii Eastw., Howell's onion
Traub, Hamilton Paul. 1972. Plant Life 28: 63–64
Traub, Hamilton Paul, & Aase, Hannah Caroline. 1959. in Munz, Philip Alexander & Keck, David Daniels. California Flora page 1376
Eastwood, Alice 1938. New Species in Liliaceae. Leaflets of Western Botany 2(7): 109
Tropicos, Allium howellii Eastw.
Biota of North America 2013 county distribution map

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