Page authors: Don Knoke, David Giblin
Micranthes oregana
bog saxifrage, Oregon saxifrage

Distribution: Both sides of the Cascades crest in Washington; Washington to California, east to Alberta, Montana, Idaho, Nevada, and Colorado.

Habitat: Bogs, streambanks and wet meadows at mid-elevations in the mountains.

Flowers: April-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps


Strong perennial from a short, woody base, the flowering stems leafless, 3-12 dm. tall, copiously glandular-pubescent above.


Leaves basal, 10-20 cm. long, contracted to a broadly-winged petiole, the blades elliptic-oblanceolate to ovate-lanceolate, entire or shallowly toothed, nearly glabrous, but with soft hairs on the petiole margins.


Inflorescence an elongate panicle, narrow to somewhat diffuse; calyx 2-3.5 mm. long, the 5 reflexed lobes oblong lanceolate; petals white to greenish-white, usually 5 but sometimes 1 or more lacking, often unequal in size, obovate to ovate-oblong, 2-4 mm. long and 1-2.5 broad; stamens 10, filaments broadly club-shaped, 1-2 mm. long, greenish-white to pinkish.


Ovary nearly superior in fruit; carpels 2-4.

Accepted Name:
Micranthes oregana (Howell) Small
Publication: N. Amer. Fl. 22: 138. 1905.

Synonyms & Misapplications:
Micranthes arnoglossa Small
Micranthes brachypus Small
Saxifraga montanensis Small
Saxifraga oregana Howell [HC]
Saxifraga oregana Howell var. montanensis (Small) C.L. Hitchc. [HC]
Saxifraga oregana Howell var. oregana [HC]
Saxifraga oregana Howell var. sierrae (Coville) Engl. & Irmsch.
Additional Resources:

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

WA Flora Checklist: Micranthes oregana checklist entry

OregonFlora: Micranthes oregana information

E-Flora BC: Micranthes oregana atlas page

CalPhotos: Micranthes oregana photos

45 photographs:
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