Taxon Details

Ambrosia monogyra

singlewhorl burrobrush

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Taxon Summary:

Ambrosia monogyra, commonly known as singlewhorl burrobrush, is a perennial shrub in the Asteraceae that is found in California and elsewhere. It occurs within Chaparral, and Sonoran desert scrub, growing at elevations from 10 to 500 meters. Ambrosia monogyra is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Ambrosia monogyra Torr. & Gray
Common Name: singlewhorl burrobrush
Family:	Asteraceae
Element Code:	PDAST50010
USDA Plants Symbol:
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	2B.2
Fed List:	None
State List:	None
Global Rank:	G5
State Rank:	S2
Other Status:	SB_CRES
CRPR Changes: added to 2.2 on 2007-02-21
Add Date:	2007-02-21
Date Edited:	2023-05-02

Ecology and Life History

Lifeform: perennial shrub

Blooming Period: Aug-Nov

Elevation:
10 - 500 meters
35 - 1640 feet

General Habitats:

Chaparral
Sonoran desert scrub

Microhabitat Details:

Microhabitat:

Sandy

Notes

Notes: Possibly threatened by trail maintenance and non-native plants. See Hymenoclea monogyra in TJM (1993). See Madrono 49: 143 (2002) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	6	20 %
Non-native plant impacts	3	10%
Other	2	6%
Road/trail construction/maint.	2	6%
Grazing	1	3%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					30
A	B	C	D	X	U
0	2	4	0	0	24

Occurrence Status:
Historical >20 Years	16
Recent <=20 Years	14

Presence:
Presumed Extant	30
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Arizona (AZ), Baja California (BA), California (CA), Nevada (NV), New Mexico (NM), Sonora, Mexico (SO), Texas (TX)

California Counties and Islands: Name (Code)
Riverside (RIV), San Bernardino (SBD), San Diego (SDG)

Quads: Name (Quad Code)
Cuyamaca Peak (3211685), Descanso (3211675), Devore (3411724), Dulzura (3211667), Imperial Beach (3211751), Jamul Mountains (3211668), La Jolla (3211772), La Mesa (3211771), Mecca (3311651), National City (3211761), Otay Mesa (3211658), Otay Mountain (3211657), Palm Springs (3311675)

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.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory