Species Details

Allium yosemitense

Yosemite onion

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Photo of Allium yosemitense
© 2012 Lynn Robertson
Photo of Allium yosemitense
© 2010 Barry Breckling
Photo of Allium yosemitense
© 2008 Dean Wm. Taylor, Ph.D.
Lifeform: perennial bulbiferous herb
Blooming Period: Apr-Jul
JFMAMJJASOND
Elevation:
535 - 2200 meters
1755 - 7220 feet
General Habitats:
  • Broadleafed upland forest
  • Chaparral
  • Cismontane woodland
  • Lower montane coniferous forest
Microhabitat Details:
Microhabitat:
  • Granitic (sometimes)
  • Metamorphic (sometimes)
  • Rocky
Notes:
Known from fewer than twenty occurrences. Possibly threatened by recreational activities. See Leaflets of Western Botany 1:132-133 (1934) for original description, Fremontia 8(1):15-18 (1980) for information on rediscovery, and Aliso 11(1):27-35 (1985) for taxonomic treatment.
Threats:
Taxonomy:
Threat List Total: 5
Total EOs % of EOs
EOs with Threat Listed: 4 29 %
THREAT LIST:
Erosion/runoff 1 7%
Mining 1 7%
Other 1 7%
Recreational use (non-ORV) 1 7%
Road/trail construction/maint. 1 7%
Total Occurrences: 14
Element Occurrence Ranks:
A B C D X U
4 1 0 1 0 8
Occurrence Status:
Historical >20 Years 14
Recent <=20 Years 0
Presence:
Presumed Extant 14
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Mariposa (MPA), Tuolumne (TUO)
Quads: Name (Quad Code)
Ascension Mtn. (3711978), Buckingham Mtn. (3711957), El Capitan (3711966), El Portal (3711967), Wawona (3711956)
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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