CNPS

CNPS Rare Plant Inventory



Taxon Details

Layia discoidea

rayless layia

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Photo of Layia discoidea
© 2010 Aaron Schusteff 		Photo of Layia discoidea
© 2010 Aaron Schusteff 		Photo of Layia discoidea
© 2010 Aaron Schusteff

Taxon Summary:

Layia discoidea, commonly known as rayless layia, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Lower montane coniferous forest, growing at elevations from 795 to 1585 meters. Layia discoidea is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

  Classification

Scientific Name:
Layia discoidea Keck
Common Name:
rayless layia
Family: Asteraceae
Element Code: PDAST5N030
USDA Plants Symbol: LADI4
Synonyms/Other Names:
Name Status: JEF, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 1B.1
Fed List: None
State List: None
Global Rank: G2
State Rank:
 S2
Other Status: BLM_S; SB_CalBG/RSABG
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2022-01-05

  Ecology and Life History

Lifeform: annual herb
Blooming Period: May
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Elevation:
795 - 1585 meters
2610 - 5200 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
  • Lower montane coniferous forest
Microhabitat Details:
Microhabitat:
  • Alluvial Terraces
  • Serpentine
  • Talus

  Notes

Notes:
Threatened by vehicles, and possibly by alteration of fire regimes. Similar to L. glandulosa. See Aliso 4:101-104 (1958) for original description.
Threats:
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 2
Total EOs % of EOs
EOs with Threat Listed: 3 7 %
THREAT LIST:
ORV activity 3 6%
Recreational use (non-ORV) 2 4%

  Occurrence Data from the CNDDB

Total Occurrences: 43
Element Occurrence Ranks:
A B C D X U
8 21 0 0 0 14
Occurrence Status:
Historical >20 Years 13
Recent <=20 Years 30
Presence:
Presumed Extant 43
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Fresno (FRE), San Benito (SBT)
Quads: Name (Quad Code)
Ciervo Mtn. (3612045), Hepsedam Peak (3612037), Hernandez Reservoir (3612047), Idria (3612046), San Benito Mtn. (3612036), Santa Rita Peak (3612035)
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 27 January 2025].
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