Taxon Report

Tonestus lyallii (Gray) G. Nesom

Lyall's tonestus

Print Report

©2020 John Doyen

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 4 January 2025].