Vascular Plants - Caryophyllaceae - Cerastium:
Cerastium tomentosum
Page Authors: Don Knoke, David Giblin
snow-in-summer 
Blooms: April-May
Habit: herb
Duration: perennial
Origin: Introduced
Distribution: Occasionally escaping cultivation in lowland northwestern Washington; British Columbia to Oregon, east across northern U.S. and southern Canada to Atlantic Coast.
Habitat: Fields, roadsides, waste sites.
Species Description:

General: Rhizomatous, mat-forming perennials, the flowering stems ascending, branched, 15-40 cm. long; non-flowering stems prostrate, readily rooting; herbage densely white-woolly.
Leaves: Leaves opposite, sessile, linear to linear-lanceolate, 10-60 mm. long and 2-8 mm. wide, not glandular.
Flowers: Inflorescences of lax, 3- to 13-flowered, bracteate cymes; pedicles ascending, straight, 10-40 mm. long; flowers white, 12-20 mm. in diameter; sepals 5, narrowly lanceolate-elliptic, 5-7 mm. long; petals 5, deltoid, 2 lobed, white, 10-18 mm. long; stamens 10; styles 5.
Fruits: Capsules cylindric, slightly curved, 10-15 mm. long, with 10 erect teeth.
Accepted Name:
Cerastium tomentosum L.
Synonyms:
(none)

Treated in Flora of the PNW as:
(not treated in H&C)
Additional Resources:

PNW Herbaria Specimens: View list of all Cerastium tomentosum specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Cerastium tomentosum specimens in the WTU Herbarium database.

Washington Flora Checklist: Cerastium tomentosum treatment.

E-Flora BC: Cerastium tomentosum atlas page.

CalPhotos: Cerastium tomentosum images.

USDA Plants Database: Cerastium tomentosum.
Additional photographs of Cerastium tomentosum:
(click on a thumbnail to view larger photo)

Richard Old

Richard Old

Richard Old

Richard Old

Richard Old

N.M. Buckingham, 1995
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Washington Native Plant Society
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