Allium obtusum

Allium obtusum is a species of wild onion known by the common name red Sierra onion or subalpine onion. It is native to eastern California and western Nevada. It is a common member in the granite foothills and mountains of the Sierra Nevada and southern Cascade Range, from Tulare County to Siskiyou County, from elevations 0f 800–3,500 metres (2,600–11,500 ft). In Nevada, it is reported only from Washoe County in the northwestern part of the state.[1][2][3][4][5]

Red Sierra onion
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Amaryllidaceae
Subfamily: Allioideae
Genus: Allium
Species:
A. obtusum
Binomial name
Allium obtusum
J.G.Lemmon

Description

The red Sierra onion, Allium obtusum, grows from a bulb one or two centimeters wide and bears a scape which can range from 2 to 17 cm tall. Unlike Allium campanulatum, A. obtusum has leaves that do not wither before the flowers bloom. Atop the scape is an umbel of up to 60 flowers, each of which may be 4 to 12 millimeters wide. The tepals are white, purple, or pink with dark purple midveins. Anthers are yellow or purple; pollen purple.[4][6][7][8]

Varieties

Two varieties are recognized:[4][9]

  • Allium obtusum var. obtusum—Leaves 0.5-4.0 mm wide; tepals white with dark midevins—most of the range of the species
  • Allium obtusum var. conspicuum Mortola & McNeal[10]—Leaves 2–14 mm wide; tepals pink with darker midevin—from about Lake Tahoe area to Mt Lassen area

See also

References
  1. Jepson . accessed 1.30.2013
  2. Calflora database: Allium obtusum . accessed 1.30.2013
  3. USDA Plants Profile for Allium obtusum (red Sierra onion)
  4. Flora of North America v 26 p 269, Allium obtusum
  5. BONAP (Biota of North America Program) floristic synthesis, Allium obtusum
  6. Hickman, J. C. 1993. The Jepson Manual: Higher Plants of California 1–1400. University of California Press, Berkeley. — Allium obtusum
  7. Allium obtusum — U.C. Photo gallery
  8. Lemmon, John Gill. 1890. Pittonia 2(8A): 69
  9. Calflora database: Allium obtusum var. obtusum
  10. Mortola, W. R. & McNeal, Dale W. 1985. Aliso 11(1): 33, f. 7.


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