Page author: David Giblin
Heuchera micrantha
smallflower alumroot
WTU specimens
Other herbaria

Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho.

Habitat: Gravelly stream banks, rock crevices and talus slopes, sea level to subalpine.

Flowers: May-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

Slender perennial from well-developed rhizomes, the 1-several stems 2.5-6 dm. tall, covered with long, whitish hairs that turn brownish when dry.

Leaves:

Leaves mostly basal, the blades cordate-oblong, 3-8 cm. broad and often longer than wide, appressed-hairy on both surfaces, shallowly lobed, the lobes broad; stipules with comb-like marginal hairs; cauline leaves 1-2, greatly reduced and bract-like.

Flowers:

Inflorescence large, many-flowered and open, the branches and pedicels filiform; calyx cup-shaped, 2-3 mm. long, the 5 lobes ovate-oblong, soft-hairy, 2/3 as long as the tubular portion; petals 5, white, 2-4 times as long as the sepals, with slender claws equal to the spatulate, entire blades; stamens 5, exserted.

Fruits:

Ovary mostly inferior; capsule 5-6 mm. long, the 2 carpels with short, slender beaks; seeds broadly oblong-ellipsoid, not curved, twice as long as broad, with prominent rows of spines.

Accepted Name:
Heuchera micrantha Douglas ex Lindl.
Publication: Edwards’s Bot. Reg. 15: plate 1302. 1830.

Synonyms & Misapplications:
(none provided)
Infraspecies:
var. diversifolia – smallflower alumroot    West of the Cascade summits, Washington and British Columbia
var. hartwegii – smallflower alumroot
var. micrantha – smallflower alumroot    Columbia River Gorge south to Marion County, Oregon, east to Idaho
Additional Resources:

PNW Herbaria: Specimen records of Heuchera micrantha in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Heuchera micrantha checklist entry.

E-Flora BC: Heuchera micrantha atlas page.

CalPhotos: Heuchera micrantha photos.

USDA Plants: Heuchera micrantha information.

51 photographs:
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