Page authors: David Giblin, Don Knoke
Micranthes idahoensis
Idaho saxifrage

Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Montana.

Habitat: Exposed areas, ledges, and open slopes.

Flowers: April-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps


Herbaceous perennial from short, horizontal rhizomes, the 1-3 leafless, pubescent stems 1-2.5 dm. tall.


Leaves basal, the blades elliptic, up to 6 cm. long and 3 cm. wide, with 15-30 rounded teeth; petioles slightly winged, 1-3 times as long as the blades.


Inflorescence pyramidal, open, up to 10 cm. long, the branches ascending; calyx divided about half its length, the 5 ovate lobes 1-2.5 mm. long; petals 5, white, broadly elliptic, 1.5-3 mm. long, with 2 yellow spots near the base; stamens 10, the filaments petaloid, strongly club-shaped, 3-4 times as broad above the middle as at the base.


Ovary less than 1/3 inferior, with 2 follicles

Accepted Name:
Micranthes idahoensis (Piper) Brouillet & Gornall
Publication: J. Bot. Res. Inst. Texas. 1: 1020. 2007.

Synonyms & Misapplications:
Saxifraga idahoensis Piper
Saxifraga marshallii Greene ssp. idahoensis (Piper) D.L. Krause & Beamish
Saxifraga marshallii Greene var. idahoensis (Piper) Engl. & Irmscher
Saxifraga occidentalis S. Watson var. idahoensis (Piper) C.L. Hitchc. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Micranthes idahoensis in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Micranthes idahoensis checklist entry

OregonFlora: Micranthes idahoensis information

E-Flora BC: Micranthes idahoensis atlas page

CalPhotos: Micranthes idahoensis photos

27 photographs:
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