Taxon Report
Dirca occidentalis Graywestern leatherwood |
 © 2017 Steve Matson |
Classification
|
Scientific Name: |
Dirca occidentalis Gray |
|
Common Name: |
western leatherwood |
| Family: | Thymelaeaceae |
| Element Code: | PDTHY03010 |
| USDA Plants Symbol: | DIOC3 |
|
Synonyms/Other Names: |
|
Ecology and Life History
| Lifeform: | perennial deciduous shrub |
| Blooming Period: Jan-Mar(Apr) | Jan-Mar(Apr) |
| Elevation: | 25-425 (80-1395) |
| General Habitats: | Broadleafed upland forest, Chaparral, Cismontane woodland, Closed-cone coniferous forest, North Coast coniferous forest, Riparian forest, Riparian woodland |
| Microhabitat: | Mesic |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2 |
|
State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG |
|
CRPR Changes: |
|
Occurrence Data from the CNDDB
| Total Occurrences: | 91 |
| Element Occurrence Ranks: | |
| Excellent (A) | 10 |
| Good (B) | 26 |
| Fair (C) | 9 |
| Poor (D) | 2 |
| None (X) | 0 |
| Unknown (U) | 44 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Alameda (ALA), Contra Costa (CCA), Marin (MRN), San Mateo (SMT), Santa Clara (SCL), Sonoma (SON) | |
| Quads: Name (Quad Code) | |
| Benicia (3812212), Bodega Head (3812331), Bolinas (3712286), Briones Valley (3712282), Cupertino (3712231), Inverness (3812217), La Honda (3712233), Los Gatos (3712128), Mindego Hill (3712232), Montara Mountain (3712254), Oakland East (3712272), Palo Alto (3712242), Richmond (3712283), San Geronimo (3812216), San Mateo (3712253), San Rafael (3712285), Valley Ford (3812238), Woodside (3712243) | |
Threat List Data from the CNDDB
| Threat List Total: | 13 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 34 | 37 % | |
| Road/trail construction/maint. | 22 | 24% |
| Other | 13 | 14% |
| Non-native plant impacts | 11 | 12% |
| Foot traffic/trampling | 7 | 7% |
| Development | 5 | 5% |
| Wood cutting or brush clearing | 5 | 5% |
| Recreational use (non-ORV) | 2 | 2% |
| Grazing | 2 | 2% |
| Insufficient population/stand size | 1 | 1% |
| Logging | 1 | 1% |
| Erosion/runoff | 1 | 1% |
| Vandalism/dumping/litter | 1 | 1% |
| Waterway bank protection/maintenance | 1 | 1% |
Citation
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 December 2024].