Page authors: David Giblin, Don Knoke
Micranthes fragosa
Clayton's saxifrage

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

Habitat: Wet slopes and cliffs, often near watercourses.

Flowers: April-June

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps


Scapose, herbaceous perennials from rhizomes, often mat-forming.


Leaves all basal, petiolate, the petioles flattened, 4-10 cm. long; blades broadly ovate to deltate, 4-10 cm. long, fleshy, the base tapered, the margins entire, hairy, the surfaces nearly glabrous.


Inflorescence an elongate, conic, open, compound panicle with 30 or more flowers, 20-50 cm. long, with purple-tipped, stalked glands; sepals 5, spreading, ovate to deltate; petals 5, white, not spotted, clawed, 2-3 mm. longer than the sepals; stamens 10, the filaments linear and flattened; pistils 2, fused half their length.


Capsules green or reddish-purple.

Accepted Name:
Micranthes fragosa (Suksd. ex Small) Small
Publication: N. Amer. Fl. 22: 137. 1905. 1905.

Synonyms & Misapplications:
Saxifraga claytoniifolia Canby ex Small
Saxifraga fragosa Suksd. ex Small
Saxifraga fragosa Suksd. ex Small ssp. claytoniifolia (Canby ex Small) Bacig.
Saxifraga integrifolia Hook. var. claytoniaefolia (Canby) Rosend. [HC]
Saxifraga nidifica Greene var. claytoniifolia (Canby ex Small) Elvander [KZ99]
Additional Resources:

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

WA Flora Checklist: Micranthes fragosa checklist entry

OregonFlora: Micranthes fragosa information

E-Flora BC: Micranthes fragosa atlas page

CalPhotos: Micranthes fragosa photos

55 photographs:
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