CNPS

CNPS Rare Plant Inventory

Taxon Details

Layia jonesii

Jones' layia

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Photo of Layia jonesii
© 2011 Chris Winchell 		Photo of Layia jonesii
© 1980 California Native Plant Society 		Photo of Layia jonesii
© 2011 Chris Winchell

Taxon Summary:

Layia jonesii, commonly known as Jones' layia, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral, and Valley and foothill grassland, growing at elevations from 5 to 400 meters. Layia jonesii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification

Scientific Name:
Layia jonesii Gray
Common Name:
Jones' layia
Family: Asteraceae
Element Code: PDAST5N090
USDA Plants Symbol: LAJO
Synonyms/Other Names:
Name Status: JEF, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G2
State Rank:
 S2
Other Status: BLM_S; SB_SBBG; USFS_S
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2024-11-05

  Ecology and Life History

Lifeform: annual herb
Blooming Period: Mar-May
JFMAMJJASOND
Elevation:
5 - 400 meters
15 - 1310 feet
General Habitats:
  • Chaparral
  • Valley and foothill grassland
Microhabitat Details:
Microhabitat:
  • Clay (sometimes)
  • Serpentine (sometimes)

  Notes

Notes:
Need current information on distribution and rarity. Threatened by grazing, non-native plants, military activities, feral pigs, frequent wildfires, and trampling.
Threats:
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 5
Total EOs % of EOs
EOs with Threat Listed: 3 12 %
THREAT LIST:
Grazing 3 12%
Improper burning regime 2 8%
Military operations 2 8%
Non-native plant impacts 2 8%
Feral pigs 2 8%

  Occurrence Data from the CNDDB

Total Occurrences: 25
Element Occurrence Ranks:
A B C D X U
0 2 1 0 0 22
Occurrence Status:
Historical >20 Years 17
Recent <=20 Years 8
Presence:
Presumed Extant 25
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
San Luis Obispo (SLO)
Quads: Name (Quad Code)
Cambria (3512151), Cayucos (3512048), Lopez Mtn. (3512035), Morro Bay North (3512047), Morro Bay South (3512037), Pismo Beach (3512026), San Luis Obispo (3512036)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Regional Map

  Map

Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

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Suggested Citation:
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 28 October 2025].
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