Taxon Report
Horkelia tenuiloba (Torr.) Graythin-lobed horkelia |
 © 1994 Doreen L. Smith |
Classification
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Scientific Name: |
Horkelia tenuiloba (Torr.) Gray |
|
Common Name: |
thin-lobed horkelia |
| Family: | Rosaceae |
| Element Code: | PDROS0W0E0 |
| USDA Plants Symbol: | HOTE2 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: May-Jul(Aug) | May-Jul(Aug) |
| Elevation: | 50-500 (165-1640) |
| General Habitats: | Broadleafed upland forest, Chaparral, Valley and foothill grassland |
| Microhabitat: | Mesic, Openings, Sandy |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 27 |
| Element Occurrence Ranks: | |
| Excellent (A) | 3 |
| Good (B) | 4 |
| Fair (C) | 6 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 14 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Marin (MRN), Mendocino (MEN), Sonoma (SON) | |
| Quads: Name (Quad Code) | |
| Annapolis (3812363), Bolinas (3712286), Camp Meeker (3812248), Dos Rios (3912363), Duncans Mills (3812341), Geyserville (3812268), Gualala (3812375), San Rafael (3712285), Sebastopol (3812247), Sonoma (3812234), Willis Ridge (3912353) | |
Threat List Data from the CNDDB
| Threat List Total: | 9 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 12 | 44 % | |
| Road/trail construction/maint. | 5 | 18% |
| Agriculture | 4 | 14% |
| Development | 4 | 14% |
| Foot traffic/trampling | 3 | 11% |
| Grazing | 1 | 3% |
| Non-native plant impacts | 1 | 3% |
| Recreational use (non-ORV) | 1 | 3% |
| Disking | 1 | 3% |
| Biocides | 1 | 3% |
Notes
| Historical occurrences need field surveys. Threatened by development. Possibly threatened by foot traffic, trail maintenance, logging, and non-native plants. See Report of the Pacific Railroad Expedition 4(5):84 (1857) for original description, and Systematic Botany 18(1):137-144 (1993) for taxonomic treatment. |
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Threats: |
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Taxonomy: |
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].