Taxon Details

Monardella leucocephala

Merced monardella

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Taxon Summary:

Monardella leucocephala, commonly known as Merced monardella, is a annual herb in the Lamiaceae that is found only in California. It occurs within Valley and foothill grassland (mesic, and sandy), growing at elevations from 35 to 100 meters. Monardella leucocephala is ranked 1A, Plants Presumed Extirpated in California and Either Rare or Extinct Elsewhere.

Classification

Scientific Name: Monardella leucocephala Gray
Common Name: Merced monardella
Family:	Lamiaceae
Element Code:	PDLAM180C0
USDA Plants Symbol:	MOLE
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1A
Fed List:	None
State List:	None
Global Rank:	GX
State Rank:	SX
Other Status:
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2024-02-06

Ecology and Life History

Lifeform: annual herb

Blooming Period: May-Aug

Elevation:
35 - 100 meters
115 - 330 feet

General Habitats:

Valley and foothill grassland (mesic, sandy)

Microhabitat Details:

Microhabitat:

Notes

Notes: Last seen in 1941. May have been extirpated by agriculture. Good potential for rediscovery, but field surveys in 1990-1992 and 1997 unsuccessful. See Proceedings of the American Academy of Arts and Sciences 7:385 (1867) for original description, and Annals of the Missouri Botanical Garden 12:90-91 (1925) 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:	3	100 %
Agriculture	3	100%
Grazing	1	33%
Mining	1	33%
Recreational use (non-ORV)	1	33%

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	0
Presumed Extirpated	3

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Merced (MER)*, Stanislaus (STA)*

Quads: Name (Quad Code)
Cooperstown (3712065)*, La Grange (3712064)*, Turlock (3712047)*

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