Sidalcea calycosa ssp. rhizomata
Common Name: Point Reyes checkerbloom
Family: Malvaceae
Element Code: PDMAL11012
Full Name: Sidalcea calycosa Jones ssp. rhizomata (Jeps.) Munz

2013 Aaron Arthur
Biology Glossary
Rarity Status Glossary
Occurrence Data from DFG
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 31
  • Element Occurrence Ranks:
    A B C D X U
    1 14 4 1 0 11
  • Population Status:
    >20 yrs
    <=20 yrs
    13 18
  • Presence:
    Present Extant Possibly Extirpated Extirpated
    31 0 0
Notes Glossary
  • Threatened by non-native plants, road maintenance, foot traffic, and pipeline construction. See Manual of the Flowering Plants of California, p. 629 (1925) by W.L. Jepson for original description.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1994-01-01
  • Last Update: 2010-03-15
Location Glossary
  • Elevation: 3 - 75 meters
  • California Endemic: yes
  • States: California
  • California Counties and Islands:   name (code)
    Mendocino (MEN),  Marin (MRN),  Sonoma (SON)
  • Quads:   name (DWR code) USGS code
    San Rafael (467A) 37122H5,  Petaluma (484B) 38122B6,  Tomales (485B) 38122B8,  Drakes Bay (485C) 38122A8,  Inverness (485D) 38122A7,  Valley Ford (502C) 38122C8,  Duncans Mills (503A) 38123D1,  Stewarts Point (520B) 38123F4,  Saunders Reef (537C) 38123G6,  Elk (552B) 39123B6,  Albion (553A) 39123B7
  • Notes:
      Definitions of codes preceding a county and/or quad:
      * Presumed extirpated
      ? Uncertain about distribution or identity
      ?* Uncertain about distribution, but presumed extirpated if once present
      (?) Occurrence confirmed, but possibly extirpated
      Species may be present in other areas where conditions are favorable.
Presumed Extant Presumed Extirpated or Unknown 1775
Links to Leading Resources of Taxon Information
Suggested Citation
CNPS, Rare Plant Program. . Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society, Sacramento, CA. Website [accessed ].

37122H5=San Rafael (467A) 37122H5;38122B6=Petaluma (484B) 38122B6;38122B8=Tomales (485B) 38122B8;38122A8=Drakes Bay (485C) 38122A8;38122A7=Inverness (485D) 38122A7;38122C8=Valley Ford (502C) 38122C8;38123D1=Duncans Mills (503A) 38123D1;38123F4=Stewarts Point (520B) 38123F4;38123G6=Saunders Reef (537C) 38123G6;39123B6=Elk (552B) 39123B6;39123B7=Albion (553A) 39123B7