Species Details

Allium sanbornii var. congdonii

Congdon's onion

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Photo of Allium sanbornii var. congdonii
© 2008 Steven Perry
Photo of Allium sanbornii var. congdonii
© 2012 Lynn Robertson
Photo of Allium sanbornii var. congdonii
© 2012 Lynn Robertson

Species Description:

Allium sanbornii var. congdonii, commonly known as Congdon's onion, is a perennial bulbiferous herb in the Alliaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 300 to 1395 meters. Allium sanbornii var. congdonii is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Scientific Name:
Allium sanbornii A.W. Wood var. congdonii Jeps.
Common Name:
Congdon's onion
Family: Alliaceae
Element Code: PMLIL02211
USDA Plants Symbol: ALSAC
Synonyms/Other Names:
Name Status: JEP, FNA, POWO,
IPNI, Tropicos
Lifeform: perennial bulbiferous herb
Blooming Period: Apr-Jul
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Elevation:
300 - 1395 meters
985 - 4575 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
Microhabitat Details: Ultramafic barrens or volcanic soils with scattered gray pines.
Microhabitat:
  • Serpentine
  • Volcanic
Notes:
Possibly threatened by non-native plants and vehicles. See Flora of California 1(6):275 (1922) by W.L. Jepson for original description, and Madroño 36(2):122-130 (1989) for taxonomic treatment.
Threats:
Taxonomy:
Total Occurrences: 0
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 0
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 0
Presence:
Presumed Extant 0
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
El Dorado (ELD), Mariposa (MPA), Nevada (NEV), Placer (PLA), Tuolumne (TUO)
Quads: Name (Quad Code)
Bear Valley (3712051), Colfax (3912018), Coulterville (3712062), Duncan Peak (3912025), Dutch Flat (3912027), Foresthill (3912017), Garden Valley (3812077), Georgetown (3812087), Greek Store (3912015), Groveland (3712072), Moccasin (3712073), Sonora (3712084), Tunnel Hill (3812086), Washington (3912037)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Presumed Extant
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