Taxon Report
Arctostaphylos glandulosa Eastw. ssp. crassifolia (Jeps.) WellsDel Mar manzanita |
 © 2012 Neal Kramer |
Taxon Summary
Arctostaphylos glandulosa ssp. crassifolia, commonly known as Del Mar manzanita, is a perennial evergreen shrub in the Ericaceae that is found in California and elsewhere. It occurs within Chaparral (maritime, and sandy), growing at elevations from 0 to 365 meters. Arctostaphylos glandulosa ssp. crassifolia is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Arctostaphylos glandulosa Eastw. ssp. crassifolia (Jeps.) Wells |
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Common Name: |
Del Mar manzanita |
| Family: | Ericaceae |
| Element Code: | PDERI040E8 |
| USDA Plants Symbol: | ARGLC4 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial evergreen shrub |
| Blooming Period: Jun-Apr | Jun-Apr |
| Elevation: | 0-365 (0-1200) |
| General Habitats: | Chaparral |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G5T2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | FE |
| Other Status: | SB_CRES |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 56 |
| Element Occurrence Ranks: | |
| Excellent (A) | 2 |
| Good (B) | 13 |
| Fair (C) | 3 |
| Poor (D) | 4 |
| None (X) | 2 |
| Unknown (U) | 32 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| San Diego (SDG) | |
| Quads: Name (Quad Code) | |
| Del Mar (3211782), Encinitas (3311713), La Mesa (3211771), Poway (3211781), Rancho Santa Fe (3311712), San Luis Rey (3311723), San Marcos (3311722) | |
Threat List Data from the CNDDB
| Threat List Total: | 16 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 38 | 68 % | |
| Development | 28 | 50% |
| Improper burning regime | 22 | 39% |
| Non-native plant impacts | 9 | 16% |
| Road/trail construction/maint. | 7 | 12% |
| Recreational use (non-ORV) | 6 | 10% |
| Other | 5 | 8% |
| Insufficient population/stand size | 5 | 8% |
| Hybridization | 5 | 8% |
| Foot traffic/trampling | 5 | 8% |
| Vandalism/dumping/litter | 4 | 7% |
| Wood cutting or brush clearing | 1 | 1% |
| ORV activity | 1 | 1% |
| Grazing | 1 | 1% |
| Erosion/runoff | 1 | 1% |
| Agriculture | 1 | 1% |
| Military operations | 1 | 1% |
Notes
| CA populations have declined greatly. Reported to intergrade with ssp. zacaensis. See Madroño 1(4):86 (1922) for original description, Madroño 19:205 (1968) for revised nomenclature, and Four Seasons 7(4):5-27 (1987) for taxonomic treatment. |
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Threats: |
| Threatened by urbanization, agricultural conversion, and fuel modification. |
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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 25 October 2025].