Taxon Report
Crocanthemum greenei (B.L. Rob.) Sorrieisland rush-rose |
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Taxon Summary
Crocanthemum greenei, commonly known as island rush-rose, is a perennial evergreen shrub in the Cistaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Closed-cone coniferous forest, and Coastal scrub, growing at elevations from 15 to 490 meters. Crocanthemum greenei is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Crocanthemum greenei (B.L. Rob.) Sorrie |
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Common Name: |
island rush-rose |
| Family: | Cistaceae |
| Element Code: | PDCIS02090 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial evergreen shrub |
| Blooming Period: (Jan)Mar-Jul(Aug) | (Jan)Mar-Jul(Aug) |
| Elevation: | 15-490 (50-1610) |
| General Habitats: | Chaparral, Cismontane woodland, Closed-cone coniferous forest, Coastal scrub |
| Microhabitat: | Openings, Rocky |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G3 |
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State Rank: |
S3 |
| State List: | None |
| Fed List: | FT |
| Other Status: | SB_SBBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 66 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 16 |
| Fair (C) | 7 |
| Poor (D) | 2 |
| None (X) | 1 |
| Unknown (U) | 39 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Los Angeles (LAX), Santa Barbara (SBA) | |
| Quads: Name (Quad Code) | |
| San Miguel Island East (3312083), San Miguel Island West (3312084)*, Santa Catalina East (3311833), Santa Catalina North (3311844), Santa Catalina South (3311834), Santa Catalina West (3311845), Santa Cruz Island A (3311987), Santa Cruz Island B (3311986), Santa Cruz Island C (3311985), Santa Cruz Island D (3311984), Santa Rosa Island East (3311988), Santa Rosa Island North (3312081), Santa Rosa Island South (3312071) | |
Threat List Data from the CNDDB
| Threat List Total: | 8 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 15 | 23 % | |
| Grazing | 8 | 12% |
| Non-native animal impacts | 8 | 12% |
| Foot traffic/trampling | 7 | 10% |
| Erosion/runoff | 5 | 7% |
| Non-native plant impacts | 4 | 6% |
| Over-collecting/poaching | 3 | 4% |
| Road/trail construction/maint. | 2 | 3% |
| Other | 1 | 1% |
Notes
| Six occurrences were discovered between 1999 and 2006 on SRO Isl., where it had not been collected since the 1930's. Presumed extirpated on SMI Isl., where it was last collected in 1939. Increasing on SCZ Isl. After reduction of feral herbivore population. Threatened by herbivory from non-native deer on SCT Isl. Also threatened by altered fire regimes and non-native plants. Possibly threatened by erosion. Hybridizes with H. scoparium. |
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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 5 February 2025].