Allium howellii

Life-forms

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
Name

Allium howellii Eastw.
Distribution
Native distribution areas:

Continental: Northern America
Regional: Southwestern USA
California

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

Eastwood, A., Leafl. W. Bot. 2: 109 1938.
USDA, NRCS. 2006. The PLANTS Database, 6 March 2006 (http://plants.usda.gov). 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.

Description

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]
Varieties

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]
References

"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