Species Details

Malacothamnus davidsonii

Davidson's bushmallow

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Photo of Malacothamnus davidsonii
© 2016 Keir Morse
Photo of Malacothamnus davidsonii
© 2016 Keir Morse
Photo of Malacothamnus davidsonii
© 2006 Gabi McLean
Scientific Name:
Malacothamnus davidsonii (Rob.) Greene
Common Name:
Davidson's bushmallow
Family: Malvaceae
Element Code: PDMAL0Q040
USDA Plants Symbol: MADA
Synonyms/Other Names:
Lifeform: perennial deciduous shrub
Blooming Period: Jun-Jan
185 - 1140 meters
605 - 3740 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
  • Coastal scrub
  • Riparian woodland
Microhabitat Details:
Threatened by development, erosion/runoff, foot traffic/trampling, herbicides, improper burning regime, non-native plant impacts, ORV activity, road/trail construction/maintenance, vandalism/dumping/litter, waterway bank protection/maintenance, wood cutting or brush clearing.
Formerly included populations from Monterey and San Luis Obispo counties that are now treated as M. discombobulatus; the two species are allopatric and genetically distinct. May intergrade with M. fasciculatus; see MadroƱo 46(4): 142-152 (1999) for information.
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%
Total Occurrences: 83
Element Occurrence Ranks:
6 13 13 1 2 48
Occurrence Status:
Historical >20 Years 29
Recent <=20 Years 54
Presumed Extant 81
Possibly Extirpated 1
Presumed Extirpated 1
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)
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.
Presumed Extant
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