Dirca occidentalis
Common Name: western leatherwood
Family: Thymelaeaceae
Element Code: PDTHY03010
Full Name: Dirca occidentalis Gray

2004 David A. Tharp
Biology Glossary
  • Lifeform: perennial deciduous shrub
  • Blooming Period: January - April
  • Habitat: mesic.
    • Broadleafed upland forest
    • Closed-cone coniferous forest
    • Chaparral
    • Cismontane woodland
    • North Coast coniferous forest
    • Riparian forest
    • Riparian woodland
Rarity Status Glossary
Occurrence Data from DFG
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 65
  • Element Occurrence Ranks:
    A B C D X U
    5 18 9 1 0 32
  • Population Status:
    >20 yrs
    <=20 yrs
    22 43
  • Presence:
    Present Extant Possibly Extirpated Extirpated
    65 0 0
Notes Glossary
  • Possibly threatened by road and trail maintenance. Populations declining; not reproducing well.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1974-01-01
  • Last Update: 2015-07-23
Location Glossary
  • Elevation: 25 - 425 meters
  • California Endemic: yes
  • States: California
  • California Counties and Islands:   name (code)
    Alameda (ALA),  Contra Costa (CCA),  Marin (MRN),  Santa Clara (SCL),  San Mateo (SMT),  Sonoma (SON)
  • Quads:   name (DWR code) USGS code
    Palo Alto (428B) 37122D2,  Mindego Hill (428C) 37122C2,  Cupertino (428D) 37122C1,  Woodside (429A) 37122D3,  La Honda (429D) 37122C3,  Hayward (447A) 37122F1,  Montara Mountain (448C) 37122E4,  San Mateo (448D) 37122E3,  Diablo (464C) 37121G8,  Briones Valley (465B) 37122H2,  Oakland East (465C) 37122G2,  Las Trampas Ridge (465D) 37122G1,  Richmond (466A) 37122H3,  Bolinas (467B) 37122H6,  Benicia (482C) 38122A2,  San Geronimo (484C) 38122A6,  Inverness (485D) 38122A7,  Valley Ford (502C) 38122C8,  Bodega Head (503D) 38123C1
  • 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 567
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 http://www.rareplants.cnps.org [accessed ].

37122D2=Palo Alto (428B) 37122D2;37122C2=Mindego Hill (428C) 37122C2;37122C1=Cupertino (428D) 37122C1;37122D3=Woodside (429A) 37122D3;37122C3=La Honda (429D) 37122C3;37122F1=Hayward (447A) 37122F1;37122E4=Montara Mountain (448C) 37122E4;37122E3=San Mateo (448D) 37122E3;37121G8=Diablo (464C) 37121G8;37122H2=Briones Valley (465B) 37122H2;37122G2=Oakland East (465C) 37122G2;37122G1=Las Trampas Ridge (465D) 37122G1;37122H3=Richmond (466A) 37122H3;37122H6=Bolinas (467B) 37122H6;38122A2=Benicia (482C) 38122A2;38122A6=San Geronimo (484C) 38122A6;38122A7=Inverness (485D) 38122A7;38122C8=Valley Ford (502C) 38122C8;38123C1=Bodega Head (503D) 38123C1