Taxon Report

Dieteria canescens (Pursh) Nuttall var. ziegleri (Munz) D.R. Morgan & R.L. Hartman

Ziegler's aster

Print Report

Taxon Summary

Dieteria canescens var. ziegleri, commonly known as Ziegler's aster, is a perennial herb in the Asteraceae that is found only in California. It occurs within Lower montane coniferous forest, and Upper montane coniferous forest, growing at elevations from 1372 to 2499 meters. Dieteria canescens var. ziegleri is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Dieteria canescens (Pursh) Nuttall var. ziegleri (Munz) D.R. Morgan & R.L. Hartman
Common Name:	Ziegler's aster
Family:	Asteraceae
Element Code:	PDAST640B2
USDA Plants Symbol:
Synonyms/Other Names:	Machaeranthera canescens (Pursh) Gray var. ziegleri (Munz) Turner

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jul-Oct	Jul-Oct
Elevation:	1372-2499 (4500-8200)
General Habitats:	Lower montane coniferous forest, Upper montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G5T1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG; SB_USDA; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	3
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	2

Location


California Endemic: True
California Counties and Islands: Name (Code)
Riverside (RIV)
Quads: Name (Quad Code)
Butterfly Peak (3311655), Toro Peak (3311654)

Threat List Data from the CNDDB


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

Notes



Known only from the Santa Rosa Mtns. Threatened by grazing, road maintenance, trampling, and vehicles. See Aliso 7:65-66 (1969) for original description and SIDA 20(4): 1396 (2003) for revised nomenclature.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 9 November 2025].