Taxon Report

Triphysaria floribunda (Benth.) Chuang & Heckard

San Francisco owl's-clover

Print Report


  Classification
Scientific Name:
 Triphysaria floribunda (Benth.) Chuang & Heckard
Common Name:
 San Francisco owl's-clover
Family: Orobanchaceae
Element Code: PDSCR2T010
USDA Plants Symbol: TRFL14
Synonyms/Other Names:
  • Orthocarpus floribundus Benth.

Ecology and Life History
Lifeform: annual herb
Blooming Period: Apr-Jun Apr-Jun
Elevation: 10-160 (35-525)
General Habitats: Coastal prairie, Coastal scrub, Valley and foothill grassland
Microhabitat: Serpentine (usually)
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G2?
State Rank:
 S2?
State List: None
Fed List: None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 50
Element Occurrence Ranks:
   Excellent (A) 2
   Good (B) 16
   Fair (C) 5
   Poor (D) 4
   None (X) 6
   Unknown (U) 17

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Marin (MRN), San Francisco (SFO), San Mateo (SMT)
Quads: Name (Quad Code)
Drakes Bay (3812218), Hunters Point (3712263), Inverness (3812217), Montara Mountain (3712254), San Francisco North (3712274), San Francisco South (3712264), San Mateo (3712253), Tomales (3812228), Valley Ford (3812238)

Threat List Data from the CNDDB

Threat List Total: 9
EOs with Threat Listed: Total EOs % of EOs
32 64 %
Grazing 22 44%
Non-native plant impacts 8 16%
Foot traffic/trampling 6 12%
Other 5 10%
Road/trail construction/maint. 3 6%
Development 3 6%
Erosion/runoff 1 2%
Insufficient population/stand size 1 2%
Mining 1 2%

Notes
Threatened by grazing, non-native plants, and trampling. See Systematic Botany 16(4):644-666 (1991) for revised nomenclature.
Threats:
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 1 January 2025].