Taxon Report
Deinandra increscens (Keck) B.G. Baldwin ssp. villosa (Tanowitz) B.G. BaldwinGaviota tarplant |
 © 2002 Kevin Merk |
Taxon Summary
Deinandra increscens ssp. villosa, commonly known as Gaviota tarplant, is a annual herb in the Asteraceae that is found only in California. It occurs within Coastal bluff scrub, Coastal scrub, and Valley and foothill grassland, growing at elevations from 20 to 430 meters. Deinandra increscens ssp. villosa is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Deinandra increscens (Keck) B.G. Baldwin ssp. villosa (Tanowitz) B.G. Baldwin |
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Common Name: |
Gaviota tarplant |
| Family: | Asteraceae |
| Element Code: | PDAST4R0U3 |
| USDA Plants Symbol: | DEINV3 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: May-Oct | May-Oct |
| Elevation: | 20-430 (65-1410) |
| General Habitats: | Coastal bluff scrub, Coastal scrub, Valley and foothill grassland |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G3T2 |
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State Rank: |
S2 |
| State List: | CE |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG; SB_SBBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 21 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 9 |
| Fair (C) | 2 |
| Poor (D) | 1 |
| None (X) | 0 |
| Unknown (U) | 9 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Santa Barbara (SBA) | |
| Quads: Name (Quad Code) | |
| Casmalia (3412075), Gaviota (3412042), Guadalupe (3412085), Lompoc Hills (3412054), Point Arguello (3412056)?, Point Conception (3412044), Point Sal (3412086), Sacate (3412043), Tranquillon Mtn. (3412055) | |
Threat List Data from the CNDDB
| Threat List Total: | 13 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 14 | 67 % | |
| Development | 7 | 33% |
| Non-native plant impacts | 6 | 28% |
| Road/trail construction/maint. | 5 | 23% |
| Grazing | 5 | 23% |
| Foot traffic/trampling | 4 | 19% |
| Erosion/runoff | 4 | 19% |
| Other | 4 | 19% |
| ORV activity | 2 | 9% |
| Feral pigs | 2 | 9% |
| Disking | 2 | 9% |
| Agriculture | 1 | 4% |
| Biocides | 1 | 4% |
| Recreational use (non-ORV) | 1 | 4% |
Notes
| State and federally-listed as Hemizonia increscens ssp. villosa; see this name in TJM (1993). See Systematic Botany 7(3):314-339 (1982) for original description, and Novon 9:462-471 (1999) for revised nomenclature. |
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Threats: |
| Seriously threatened by energy development and non-native plants. |
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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 November 2025].