Taxon Report
Isocoma menziesii (H. & A.) G. Nesom var. decumbens (Greene) G. Nesomdecumbent goldenbush |
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Taxon Summary
Isocoma menziesii var. decumbens, commonly known as decumbent goldenbush, is a perennial shrub in the Asteraceae that is found in California and elsewhere. It occurs within Chaparral, Coastal scrub (often disturbed areas, and sandy), growing at elevations from 10 to 250 meters. Isocoma menziesii var. decumbens is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Isocoma menziesii (H. & A.) G. Nesom var. decumbens (Greene) G. Nesom |
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Common Name: |
decumbent goldenbush |
| Family: | Asteraceae |
| Element Code: | PDAST57091 |
| USDA Plants Symbol: | ISMED |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial shrub |
| Blooming Period: Apr-Nov | Apr-Nov |
| Elevation: | 10-250 (35-820) |
| General Habitats: | Chaparral, Coastal scrub |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G3G5T2T3 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_CRES |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 126 |
| Element Occurrence Ranks: | |
| Excellent (A) | 2 |
| Good (B) | 14 |
| Fair (C) | 3 |
| Poor (D) | 3 |
| None (X) | 2 |
| Unknown (U) | 102 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| Los Angeles (LAX), Orange (ORA), San Diego (SDG), Ventura (VEN) | |
| Quads: Name (Quad Code) | |
| Alpine (3211677), Del Mar (3211782), Dulzura (3211667), El Cajon (3211678), Encinitas (3311713), Escondido (3311711), Imperial Beach (3211751), Jamul Mountains (3211668), La Jolla (3211772), La Mesa (3211771), Laguna Beach (3311757), Las Pulgas Canyon (3311734), Live Oak Springs (3211663), Long Beach (3311872), Malibu Beach (3411816), Margarita Peak (3311744), National City (3211761), Newport Beach (3311768), Oceanside (3311724), Otay Mesa (3211658), Point Loma (3211762), Potrero (3211655), Poway (3211781), Ramona (3311617), Rancho Santa Fe (3311712), San Clemente (3311745), San Clemente Island South (3211873), San Luis Rey (3311723), San Marcos (3311722), San Nicolas Island (3311924), San Onofre Bluff (3311735), San Pedro (3311863), San Vicente Reservoir (3211688), Santa Catalina East (3311833), Santa Catalina North (3311844), Santa Catalina South (3311834), Santa Catalina West (3311845), Tecate (3211656), Torrance (3311873) | |
Threat List Data from the CNDDB
| Threat List Total: | 10 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 28 | 22 % | |
| Non-native plant impacts | 15 | 11% |
| Development | 11 | 8% |
| ORV activity | 4 | 3% |
| Foot traffic/trampling | 2 | 1% |
| Improper burning regime | 2 | 1% |
| Road/trail construction/maint. | 2 | 1% |
| Vandalism/dumping/litter | 1 | 0% |
| Erosion/runoff | 1 | 0% |
| Other | 1 | 0% |
| Recreational use (non-ORV) | 1 | 0% |
Notes
| Need quads for SCM and SCT islands. Threatened by development. Equals Haplopappus venetus ssp. furfuraceus, a synonym of I. menziesii var. menziesii in The Jepson Manual. See Leaflets of Botanical Observation and Criticism 1:172 (1906) for original description, and Phytologia 70(2):69-114 (1991) for taxonomic treatment. |
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Threats: |
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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 9 May 2025].