Taxon Report

Tonestus lyallii (Gray) G. Nesom

Lyall's tonestus

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Taxon Summary

Tonestus lyallii, commonly known as Lyall's tonestus, is a perennial rhizomatous herb in the Asteraceae that is found in California and elsewhere. It occurs within Alpine boulder and rock field, growing at elevations from 2500 to 2700 meters. Tonestus lyallii is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Tonestus lyallii (Gray) G. Nesom
Common Name:	Lyall's tonestus
Family:	Asteraceae
Element Code:	PDASTE0050
USDA Plants Symbol:	TOLY
Synonyms/Other Names:	Haplopappus lyallii Gray

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: Jul-Aug	Jul-Aug
Elevation:	2500-2700 (8205-8860)
General Habitats:	Alpine boulder and rock field
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.3
Global Rank:	G5
State Rank:	S1
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 2.3 to 2B.3 on 2013-06-12

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: False
California Counties and Islands: Name (Code)
Trinity (TRI)
Quads: Name (Quad Code)
Mt. Hilton (4012381), Siligo Peak (4012288), Thompson Peak (4112311)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	%

Notes



See Madroño 21(8):535 (1972) for first CA occurrence, and Phytologia 68(2):144-155 (1990) for revised nomenclature.
Threats:

Taxonomy:

Selected References

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 5 February 2025].