Taxon Report

Ivesia pickeringii Gray

Pickering's ivesia

Print Report

Taxon Summary

Ivesia pickeringii, commonly known as Pickering's ivesia, is a perennial herb in the Rosaceae that is found only in California. It occurs within Lower montane coniferous forest, and Meadows and seeps, growing at elevations from 800 to 1510 meters. Ivesia pickeringii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Ivesia pickeringii Gray
Common Name:	Pickering's ivesia
Family:	Rosaceae
Element Code:	PDROS0X0D0
USDA Plants Symbol:	IVPI
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jun-Aug(Oct)	Jun-Aug(Oct)
Elevation:	800-1510 (2625-4955)
General Habitats:	Lower montane coniferous forest, Meadows and seeps
Microhabitat:	Clay, Mesic, Seeps (usually), Serpentine (usually)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	13
Element Occurrence Ranks:
Excellent (A)	4
Good (B)	4
Fair (C)	3
Poor (D)	0
None (X)	0
Unknown (U)	2

Location


California Endemic: True
California Counties and Islands: Name (Code)
Siskiyou (SIS), Trinity (TRI)
Quads: Name (Quad Code)
Callahan (4112237), China Mtn. (4112245), Covington Mill (4012287), Scott Mountain (4112236), Tangle Blue Lake (4112226), Weed (4112244), Whisky Bill Peak (4112215)

Threat List Data from the CNDDB


Threat List Total:	8
EOs with Threat Listed:	Total EOs	% of EOs
	9	69 %
Logging	5	38%
Road/trail construction/maint.	5	38%
Grazing	4	30%
Other	3	23%
Erosion/runoff	2	15%
Improper burning regime	1	7%
Mining	1	7%
Non-native plant impacts	1	7%

Notes



Threatened by grazing, logging, mining, road maintenance, and habitat loss. Klamath NF has adopted species management guidelines. See Proceedings of the American Academy of Arts and Sciences 6:531 (1865) for original description.
Threats:

Taxonomy:

Selected References

Ivesia pickeringii account for potential Species of Conservation Concern evaluation (2020)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 29 October 2025].