CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record ambrosia_pumila - Sun, Nov. 28, 2021 13:24 ET c
Ambrosia pumila
common nameSan Diego ambrosia
CalPhotos image
more photos
© 2003 Jim Rocks  Follow image link for photo data.
life form rhizomatous herb
CA Rare Plant Rank
List 1B.1
LIST 1B: Rare, threatened, or endangered in California and elsewhere.
     0.1: Seriously endangered in California
state rank
S1      ranking system key
global rank
G1     G1: Less than 6 occurrences OR less than 1,000 individuals OR less than 2,000 acres.
Where did the "RED" code go?
CA state listingNone  
federal listingEndangered  07/02/02
where found
MAPS - Use v8 link below.

Topographic quads (21):
Barrett Lake (009B) 3211666, Jamul Mountains (010B) 3211668, National City (011A) 3211761, Imperial Beach (011D) 3211751, El Cajon (021C) 3211678, Del Mar (022B) 3211782, La Jolla (022C) 3211772, La Mesa (022D) 3211771, San Marcos (035B) 3311722, Rancho Santa Fe (035C) 3311712, Escondido (035D) 3311711, San Luis Rey (036A) 3311723, Oceanside (036B) 3311724, Aguanga (049A) 3311647, Temecula (050B) 3311742, Bonsall (050C) 3311732, Murrieta (068C) 3311752, Bachelor Mountain (068D) 3311751, Lake Elsinore (069A) 3311763, Alberhill (069B) 3311764, Riverside West (086B)* 3311784
quad data info

Counties, states, regions:
Riverside (RIV), San Diego (SDG), Baja California (BA)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Chaparral (Chprl)
•Coastal scrub (CoScr)
•Valley and foothill grassland (VFGrs)
•Vernal pools (VnPls)/sandy loam or clay, often in disturbed areas, sometimes alkaline
blooming period Apr-Oct  
elevation range20 - 415 meters
Threatened by development, non-native plants, vehicles, road maintenance, and foot traffic. Confused with A. confertiflora, but the two are quite distinct. See Madroņo 39(2):157 (1992) for first RIV Co. record.
full nameAmbrosia pumila (Nutt.) Gray
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  AMPU4 Element Code  PDAST0C0M0
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
search Google CNPS website    search Google entire web

Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18mar). California Native Plant Society. Sacramento, CA. Accessed on Sun, Nov. 28, 2021 from

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