Taxon Report

Micranthes howellii (Greene) Small

Howell's saxifrage

Print Report

Taxon Summary

Micranthes howellii, commonly known as Howell's saxifrage, is a perennial rhizomatous herb in the Saxifragaceae that is found in California and elsewhere. It occurs within Cismontane woodland, growing at elevations from 75 to 900 meters. Micranthes howellii is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Micranthes howellii (Greene) Small
Common Name:	Howell's saxifrage
Family:	Saxifragaceae
Element Code:	PDSAX0U0T0
USDA Plants Symbol:
Synonyms/Other Names:	Saxifraga howellii

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: Mar-May	Mar-May
Elevation:	75-900 (245-2955)
General Habitats:	Cismontane woodland
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G4
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
Del Norte (DNT), Humboldt (HUM)
Quads: Name (Quad Code)
French Camp Ridge (4112327), Gasquet (4112378), High Plateau Mtn. (4112388), Hiouchi (4112471), Hurdygurdy Butte (4112377), Shelly Creek Ridge (4112387), Ship Mountain (4112367)

Threat List Data from the CNDDB


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

Notes




Threats:

Taxonomy:

Selected References

Micranthes howellii profile for potential Species of Conservation Concern evaluation (2022)

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].