Page author: David Giblin
Micranthes ferruginea
rusty saxifrage
WTU specimens
Other herbaria

Distribution: In the Olympics and Cascades mountains in Washington; Alaska to south California, east to Idaho, Montana, and Wyoming.

Habitat: Open, moist, often rocky areas, low to mid-elevations in the mountains.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

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:

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.

Flowers:

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.

Fruits:

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. 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.

E-Flora BC: Micranthes ferruginea atlas page.

CalPhotos: Micranthes ferruginea photos.

USDA Plants: Micranthes ferruginea information.

46 photographs:
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