Taxon Report
Deinandra conjugens (Keck) B.G. BaldwinOtay tarplant |
|
Taxon Summary
Deinandra conjugens, commonly known as Otay tarplant, is a annual herb in the Asteraceae that is found in California and elsewhere. It occurs within Coastal scrub, and Valley and foothill grassland, growing at elevations from 25 to 300 meters. Deinandra conjugens is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
|
Scientific Name: |
Deinandra conjugens (Keck) B.G. Baldwin |
|
Common Name: |
Otay tarplant |
| Family: | Asteraceae |
| Element Code: | PDAST4R070 |
| USDA Plants Symbol: | DECO13 |
|
Synonyms/Other Names: |
|
Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: (Apr)May-Jun | (Apr)May-Jun |
| Elevation: | 25-300 (80-985) |
| General Habitats: | Coastal scrub, Valley and foothill grassland |
| Microhabitat: | Clay |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1G2 |
|
State Rank: |
S1 |
| State List: | CE |
| Fed List: | FT |
| Other Status: | SB_CalBG/RSABG; SB_CRES |
|
CRPR Changes: |
|
Occurrence Data from the CNDDB
| Total Occurrences: | 40 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 11 |
| Fair (C) | 7 |
| Poor (D) | 3 |
| None (X) | 0 |
| Unknown (U) | 19 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| San Diego (SDG) | |
| Quads: Name (Quad Code) | |
| Dulzura (3211667), Imperial Beach (3211751), Jamul Mountains (3211668), National City (3211761), Otay Mesa (3211658) | |
Threat List Data from the CNDDB
| Threat List Total: | 14 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 33 | 83 % | |
| Non-native plant impacts | 25 | 62% |
| Development | 21 | 52% |
| Foot traffic/trampling | 14 | 35% |
| Road/trail construction/maint. | 14 | 35% |
| Vandalism/dumping/litter | 13 | 32% |
| ORV activity | 11 | 27% |
| Erosion/runoff | 10 | 25% |
| Wood cutting or brush clearing | 7 | 17% |
| Other | 5 | 12% |
| Improper burning regime | 3 | 7% |
| Altered flood/tidal/hydrologic regime | 2 | 5% |
| Recreational use (non-ORV) | 2 | 5% |
| Grazing | 2 | 5% |
| Non-native animal impacts | 1 | 2% |
Notes
| Threatened by development, agriculture, vehicles, illegal dumping, foot traffic, non-native plants, habitat disturbance, and Border Patrol activities. Possibly threatened by landfill construction. Known in BA from only one occurrence. State and federally listed as Hemizonia conjugens; see this name in The Jepson Manual. See Aliso 4(1):109 (1958) for original description, Madroño 25(3):159 (1978) for information on distribution and taxonomy, and Novon 9:462-471 (1999) for revised nomenclature. |
|
Threats: |
|
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 8 November 2025].