Taxon Details

Malacothrix similis

Mexican malacothrix

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Taxon Summary:

Malacothrix similis, commonly known as Mexican malacothrix, is a annual herb in the Asteraceae that is found in California and elsewhere. It occurs within Coastal dunes, growing at elevations from 0 to 40 meters. Malacothrix similis is ranked 2A, Plants Presumed Extirpated in California, But More Common Elsewhere.

Classification

Scientific Name: Malacothrix similis W.S. Davis & Raven
Common Name: Mexican malacothrix
Family:	Asteraceae
Element Code:	PDAST660D0
USDA Plants Symbol:	MASI5
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	2A
Fed List:	None
State List:	None
Global Rank:	G2G3
State Rank:	SH
Other Status:
CRPR Changes: added to 1A on 2007-04-05
Add Date:	2007-04-05
Date Edited:	2025-10-29

Ecology and Life History

Lifeform: annual herb

Blooming Period: Apr-May

Elevation:
0 - 40 meters
0 - 130 feet

General Habitats:

Coastal dunes

Microhabitat Details:

Microhabitat:

Notes

Notes: Last seen in 1925 at Hueneme Beach in Ventura County. A synonym of Malacothrix stebbinsii in The Jepson Manual (1993). See Madrono 16: 262 (1962) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	0
	Total EOs	% of EOs
EOs with Threat Listed:	0	%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					3
A	B	C	D	X	U
0	0	0	0	3	0

Occurrence Status:
Historical >20 Years	3
Recent <=20 Years	0

Presence:
Presumed Extant	0
Possibly Extirpated	3
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Baja California (BA), California (CA)

California Counties and Islands: Name (Code)
Santa Barbara (SBA)?*, Ventura (VEN)*

Quads: Name (Quad Code)
Oxnard (3411922)*, San Miguel Island East (3312083)?*, San Miguel Island West (3312084)?*, Santa Cruz Island A (3311987)?*, Santa Cruz Island B (3311986)?*, Santa Cruz Island C (3311985)?*, Santa Cruz Island D (3311984)?*

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