Species Details

Ambrosia pumila

San Diego ambrosia

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Photo of Ambrosia pumila
© 2010 Benjamin Smith
Photo of Ambrosia pumila
© 2013 Keir Morse
Photo of Ambrosia pumila
© 2010 Eliza Maher Hasselquist
Scientific Name:
Ambrosia pumila (Nutt.) Gray
Common Name:
San Diego ambrosia
Family: Asteraceae
Element Code: PDAST0C0M0
USDA Plants Symbol: AMPU4
Synonyms/Other Names:
Lifeform: perennial rhizomatous herb
Blooming Period: Apr-Oct
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Elevation:
20 - 415 meters
65 - 1360 feet
General Habitats:
  • Chaparral
  • Coastal scrub
  • Valley and foothill grassland
  • Vernal pools
Microhabitat Details:
Microhabitat:
  • Alkaline (sometimes)
  • Clay (sometimes)
  • Disturbed areas (often)
  • Loam (sometimes)
  • Sandy (sometimes)
Notes:
Threatened by development, non-native plants, vehicles, road maintenance, and foot traffic. Confused with A. confertiflora, but the two are quite distinct. See MadroƱo 39(2):157 (1992) for first RIV Co. record.
Threats:
Taxonomy:
Threat List Total: 17
Total EOs % of EOs
EOs with Threat Listed: 54 89 %
THREAT LIST:
Development 43 70%
Non-native plant impacts 29 47%
Foot traffic/trampling 15 24%
Road/trail construction/maint. 15 24%
Other 14 22%
Total Occurrences: 61
Element Occurrence Ranks:
A B C D X U
2 6 9 7 21 16
Occurrence Status:
Historical >20 Years 22
Recent <=20 Years 39
Presence:
Presumed Extant 40
Possibly Extirpated 6
Presumed Extirpated 15
California Endemic:
California Island:
States: Name (Code)
Baja California (BA), California (CA)
California Counties and Islands: Name (Code)
Riverside (RIV), San Diego (SDG)
Quads: Name (Quad Code)
Aguanga (3311647), Alberhill (3311764), Bachelor Mtn. (3311751), Bonsall (3311732), Del Mar (3211782), El Cajon (3211678), Escondido (3311711), Imperial Beach (3211751), Jamul Mountains (3211668), La Jolla (3211772), La Mesa (3211771), Lake Elsinore (3311763), National City (3211761), Oceanside (3311724), Rancho Santa Fe (3311712), Riverside West (3311784)*, San Luis Rey (3311723), Temecula (3311742), Vail Lake (3311648)
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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