Taxon Report
Malacothrix squalida Greeneisland malacothrix |
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Taxon Summary
Malacothrix squalida, commonly known as island malacothrix, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Coastal bluff scrub, growing at elevations from 15 to 200 meters. Malacothrix squalida is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Malacothrix squalida Greene |
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Common Name: |
island malacothrix |
| Family: | Asteraceae |
| Element Code: | PDAST660K0 |
| USDA Plants Symbol: | MASQ |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Jul | Apr-Jul |
| Elevation: | 15-200 (50-655) |
| General Habitats: | Chaparral, Cismontane woodland, Coastal bluff scrub |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | FE |
| Other Status: | SB_SBBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 4 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 0 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 4 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Santa Barbara (SBA), Ventura (VEN) | |
| Quads: Name (Quad Code) | |
| Anacapa Island (3311983), Santa Cruz Island C (3311985) | |
Threat List Data from the CNDDB
| Threat List Total: | 2 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 2 | 50 % | |
| Erosion/runoff | 2 | 50% |
| Non-native plant impacts | 1 | 25% |
Notes
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Last seen on SCZ Isl. in 1968 and on ANA Isl. in 1986. Threatened by feral herbivores on SCZ Isl., and by seabird-caused erosion on ANA Isl. Field surveys needed; 1989 surveys on ANA Isl. were unsuccessful. See Bulletin of the California Academy of Sciences |
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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 21 November 2025].