Page author: David Giblin
Micranthes ferruginea
rusty saxifrage

Distribution: Occurring in the Cascades and Olympic Mountains, and in the mountains of northeastern in Washington; Alaska to south California, east to Idaho, Montana, and Wyoming.

Habitat: Open, moist, often rocky areas, from low to middle elevations in the mountains.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps


Perennial from a short, woody base or thick rhizome, the 1-several leafless, freely-branched stems 1.5-3.5 dm. tall, soft-pubescent below and glandular-pubescent above.


Leaves all basal, oblanceolate, 2-10 cm. long and 5-15 mm. wide, with 7-17 teeth, thinly hairy, tapered gradually to broad, winged petioles not clearly differentiated from the blades.


Inflorescence an open, diffuse panicle extending nearly to the base of the stem; calyx lobed almost to the base, the 5 lobes oblong-ovate, sharply reflexed, 1.5-2.5 mm. long, usually reddish or purplish; petals 5, white, 4-6 mm. long, dimorphic, 3 much broader than the other 2; stamens 10, the filaments slender and white; flowers vary from all normal to mostly replaced by leafy bulblets.


Ovary almost completely superior, capsule 4-6 mm. long; carpels 2, fused their length.

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

Synonyms & Misapplications:
Saxifraga ferruginea Graham [HC]
Saxifraga ferruginea Graham var. ferruginea [HC]
Saxifraga ferruginea Graham var. foliacea A.M. Johnson
Saxifraga ferruginea Graham var. macounii Engl. & Irmscher [HC]
Saxifraga ferruginea Graham var. vreelandii (Small) Engl. & Irmscher [KZ99]
Saxifraga vreelandii (Small) Fedde ex Just
Additional Resources:

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

WA Flora Checklist: Micranthes ferruginea checklist entry

OregonFlora: Micranthes ferruginea information

E-Flora BC: Micranthes ferruginea atlas page

CalPhotos: Micranthes ferruginea photos

66 photographs:
Group by