Species Details

Hibiscus lasiocarpos var. occidentalis

woolly rose-mallow

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Photo by © 2020 Steven Perry  max-height:128px; max-width:145px;
© 2020 Steven Perry
Photo by © 2012 Steven Perry  max-height:128px; max-width:145px;
© 2012 Steven Perry
Photo by © 2012 Steven Perry  max-height:128px; max-width:145px;
© 2012 Steven Perry
CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G5T3
State Rank:
Other Status: SB_CalBG/RSABG; SB_UCBG
CRPR Changes:
changed from 2.2 to 1B.2 on 2010-01-04
Add Date: 1974-01-01
Date Edited: 2022-01-05
Lifeform: perennial rhizomatous herb (emergent)
Blooming Period: Jun-Sep
0 - 120 meters
0 - 395 feet
General Habitat:
  • Marshes and swamps (freshwater)
General Micro Habitat: Often in riprap on sides of levees.
Micro Habitat:
Most occurrences are very small. Seriously threatened by habitat disturbance, development, agriculture, recreational activites, and channelization of the Sacramento River and its tributaries. Also threatened by weed control measures and erosion. Possibly threatened by trail maintenance. See MadroƱo 56(2):104-111 for revised taxonomy.
Total Occurrences: 173
Element Occurrence Ranks:
0 78 38 16 1 40
Occurrence Status:
Historical >20 Years 79
Recent <=20 Years 94
Presumed Extant 172
Possibly Extirpated 0
Presumed Extirpated 1
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Butte (BUT), Colusa (COL), Contra Costa (CCA), Glenn (GLE), Sacramento (SAC), San Joaquin (SJQ), Solano (SOL), Sutter (SUT), Yolo (YOL)
Quads: Name (Quad Code)
Bouldin Island (3812115), Bruceville (3812134), Butte City (3912148), Clarksburg (3812145), Clifton Court Forebay (3712175), Courtland (3812135), Dozier (3812137), Florin (3812144), Gilsizer Slough (3912116), Grays Bend (3812166), Hamlin Canyon (3912166), Holt (3712184), Isleton (3812125), Jersey Island (3812116), Knights Landing (3812176), Liberty Island (3812136), Llano Seco (3912158), Logandale (3912242), Meridian (3912128), Nelson (3912157), Ord Ferry (3912168), Oroville (3912155), Paradise West (3912176), Pennington (3912137), Richardson Springs (3912177), Rio Vista (3812126), Sacramento West (3812155), Sanborn Slough (3912138), Shippee (3912156), Stockton West (3712183), Sutter Buttes (3912127), Sutter Causeway (3812186), Terminous (3812114), Thornton (3812124), Tisdale Weir (3912117), Verona (3812175), West of Biggs (3912147), Woodward Island (3712185)
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
Counties   Quads