Taxon Report

Horkelia daucifolia (Greene) Rydb. var. indicta (Jeps.) Ertter & Reveal

Jepson's horkelia

Print Report


© 2011 Dean Wm. Taylor, Ph.D.

Taxon Summary

Horkelia daucifolia var. indicta, commonly known as Jepson's horkelia, is a perennial herb in the Rosaceae that is found only in California. It occurs within Cismontane woodland, growing at elevations from 240 to 670 meters. Horkelia daucifolia var. indicta is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

  Classification
Scientific Name:
 Horkelia daucifolia (Greene) Rydb. var. indicta (Jeps.) Ertter & Reveal
Common Name:
 Jepson's horkelia
Family: Rosaceae
Element Code: PDROS0W053
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial herb
Blooming Period: Apr-Jun Apr-Jun
Elevation: 240-670 (785-2200)
General Habitats: Cismontane woodland
Microhabitat: Clay, Openings, Vernally Mesic, Volcanic
Microhabitat Details: Quaternary pyroclastic flows

Conservation Status
CA Rare Plant Rank: 1B.1
Global Rank: G4T1
State Rank:
 S1
State List: None
Fed List: None
Other Status: SB_UCSC
CRPR Changes:
  • added to 1B.1 on 2011-09-26

Occurrence Data from the CNDDB
Total Occurrences: 3
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 0
   Fair (C) 0
   Poor (D) 0
   None (X) 0
   Unknown (U) 3

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Shasta (SHA), Tehama (TEH)
Quads: Name (Quad Code)
Inwood (4012158), Rosewood (4012235)

Threat List Data from the CNDDB

Threat List Total: 1
EOs with Threat Listed: Total EOs % of EOs
1 33 %
Development 1 33%

Notes
See H. daucifolia in The Jepson Manual (1993). See Manual of the Flowering Plants of California, p. 493 (1925) by W.L. Jepson for original description, and Novon 17:315-325 (2007) for taxonomic treatment.
Threats:
Threatened by habitat fragmentation. Potentially threatened by development. 
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 4 July 2025].