Species Details

Malacothamnus davidsonii

Davidson's bush-mallow

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Classification

Scientific Name: Malacothamnus davidsonii (Rob.) Greene
Common Name: Davidson's bush-mallow
Family:	Malvaceae
Element Code:	PDMAL0Q040
USDA Plants Symbol:	MADA
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G2
State Rank:	S2
Other Status:	SB_CalBG/RSABG
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: perennial deciduous shrub

Blooming Period: Jun-Jan

Elevation:
185 - 1140 meters
605 - 3740 feet

General Habitats:

Chaparral
Cismontane woodland
Coastal scrub
Riparian woodland

Microhabitat Details:

Microhabitat:

Notes

Notes: Threatened by urbanization in LAX Co. Potentially threatened by development, maintenance activities and erosion. Intergrades with M. fasciculatus; see Madroño 46(3):142-152 (1999) for information.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	16
	Total EOs	% of EOs
EOs with Threat Listed:	35	42 %
Other	21	25%
Road/trail construction/maint.	18	21%
Non-native plant impacts	12	14%
Foot traffic/trampling	10	12%
Wood cutting or brush clearing	9	10%
Development	8	9%
Improper burning regime	7	8%
Grazing	6	7%
Feral pigs	6	7%
ORV activity	6	7%
Erosion/runoff	3	3%
Biocides	2	2%
Altered flood/tidal/hydrologic regime	1	1%
Military operations	1	1%
Vandalism/dumping/litter	1	1%
Waterway bank protection/maintenance	1	1%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					83
A	B	C	D	X	U
6	13	13	1	2	48

Occurrence Status:
Historical >20 Years	29
Recent <=20 Years	54

Presence:
Presumed Extant	81
Possibly Extirpated	1
Presumed Extirpated	1

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Los Angeles (LAX), Monterey (MNT), San Luis Obispo (SLO)

Quads: Name (Quad Code)
Bear Canyon (3612113), Bradley (3512077), Bryson (3512171), Burbank (3411823), Burnett Peak (3512172), Condor Peak (3411832), Cosio Knob (3612112), Hames Valley (3512088), Jolon (3512182), San Fernando (3411834), Sunland (3411833), Sycamore Flat (3612134), Thompson Canyon (3612122), Tierra Redonda Mountain (3512078), Van Nuys (3411824), Williams Hill (3512181)

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