Taxon Report
Arctostaphylos rudis Jeps. & Wies.sand mesa manzanita |
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Classification
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Scientific Name: |
Arctostaphylos rudis Jeps. & Wies. |
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Common Name: |
sand mesa manzanita |
| Family: | Ericaceae |
| Element Code: | PDERI041E0 |
| USDA Plants Symbol: | ARRU2 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial evergreen shrub |
| Blooming Period: Nov-Feb | Nov-Feb |
| Elevation: | 25-322 (80-1055) |
| General Habitats: | Chaparral, Coastal scrub |
| Microhabitat: | Sandy |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_SBBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 36 |
| Element Occurrence Ranks: | |
| Excellent (A) | 4 |
| Good (B) | 7 |
| Fair (C) | 4 |
| Poor (D) | 4 |
| None (X) | 0 |
| Unknown (U) | 17 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| San Luis Obispo (SLO), Santa Barbara (SBA) | |
| Quads: Name (Quad Code) | |
| Arroyo Grande NE (3512025), Casmalia (3412075), Guadalupe (3412085), Lompoc (3412064), Lompoc Hills (3412054), Los Alamos (3412063), Nipomo (3512014), Oceano (3512015), Orcutt (3412074), Pismo Beach (3512026), Point Arguello (3412056), Point Sal (3412086), Sisquoc (3412073), Surf (3412065), Tranquillon Mtn. (3412055) | |
Threat List Data from the CNDDB
| Threat List Total: | 10 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 19 | 53 % | |
| Development | 15 | 41% |
| Non-native plant impacts | 5 | 13% |
| Road/trail construction/maint. | 5 | 13% |
| Wood cutting or brush clearing | 4 | 11% |
| Other | 3 | 8% |
| Improper burning regime | 3 | 8% |
| Agriculture | 2 | 5% |
| Disking | 1 | 2% |
| Grazing | 1 | 2% |
| Vandalism/dumping/litter | 1 | 2% |
Notes
| Plants on Nipomo Mesa (SLO Co.) have been determined to be a novel species, with A. rudis becoming restricted to SBA Co. See Erythea 8:100 (1938) for original description. |
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Threats: |
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Threatened by development, agriculture, oil extraction, and road construction and maintenance. Severely reduced on Nipomo Mesa, where potentially seriously threatened by housing development. |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 7 January 2025].