Taxon Report

Harmonia hallii (Keck) B.G. Baldwin

Hall's harmonia

Print Report


© 2015 John Doyen

Taxon Summary

Harmonia hallii, commonly known as Hall's harmonia, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral, growing at elevations from 305 to 975 meters. Harmonia hallii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification
Scientific Name:
 Harmonia hallii (Keck) B.G. Baldwin
Common Name:
 Hall's harmonia
Family: Asteraceae
Element Code: PDAST650A0
USDA Plants Symbol: HAHA11
Synonyms/Other Names:
  • Madia hallii Keck

Ecology and Life History
Lifeform: annual herb
Blooming Period: (Mar)Apr-Jun (Mar)Apr-Jun
Elevation: 305-975 (1000-3200)
General Habitats: Chaparral
Microhabitat:
Microhabitat Details:

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

Occurrence Data from the CNDDB
Total Occurrences: 23
Element Occurrence Ranks:
   Excellent (A) 2
   Good (B) 5
   Fair (C) 1
   Poor (D) 0
   None (X) 0
   Unknown (U) 15

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Colusa (COL), Lake (LAK), Napa (NAP), Yolo (YOL)
Quads: Name (Quad Code)
Aetna Springs (3812264), Benmore Canyon (3912215), Clearlake Highlands (3812286), Detert Reservoir (3812265), Hough Springs (3912225), Jericho Valley (3812274), Kelseyville (3812287), Knoxville (3812273), Leesville (3912224), Lower Lake (3812285), Middletown (3812275), The Geysers (3812277), Wilbur Springs (3912214), Wilson Valley (3812284)

Threat List Data from the CNDDB

Threat List Total: 4
EOs with Threat Listed: Total EOs % of EOs
9 39 %
Road/trail construction/maint. 5 21%
Development 4 17%
Grazing 1 4%
ORV activity 1 4%

Notes
Threats:
Threatened by mining.
Taxonomy:
A synonym of Madia hallii in The Jepson Manual.

Selected References

Madroño 3(1):5 (1935)
Novon 9:462-471 (1999)
Harmonia hallii profile for potential Species of Conservation Concern evaluation (2018)
USFS Potential Species of Conservation Concern Profile
Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 January 2025].