Page author: David Giblin
Cerastium fontanum
common mouse-ear chickweed
WTU specimens
Other herbaria
WTU images

Distribution: Introduced and common in most of Canada and the United States; more common east of the Cascades

Habitat: Disturbed ground, lawns and gardens

Flowers: March - September

Origin: Introduced from Europe

Conservation Status: Not of concern


Stiff-hairy, glandular biennial or perennial, the stems sprawling but the flowering stems erect, 2-4 dm. tall.


Leaves of the prostrate stems opposite, crowded, oblanceolate, 10-25 mm. long and 2-5 mm. broad; leaves of the flowering stems opposite, widely spaced, up to 4 cm. long and 15 mm. broad.


Flowers several in an open, dichotomously branched inflorescence; sepals 5, 4-7 mm. long, stiff-hairy; petals 5, white, bi-lobed, equaling the sepals; stamens 10; styles 5.


Capsule membranous, cylindric, slightly curved, twice as long as the sepals, opening by 10 teeth.

Accepted Name:
Cerastium fontanum Baumg.
Publication: Enum. Stirp. Transsilv. 1: 425. 1816.

Synonyms & Misapplications:
(none provided)
ssp. vulgare – common chickweed, mouse-ear chickweed    Introduced to most of Canada and the United States; more common east of the Cascades
Additional Resources:

PNW Herbaria: Specimen records of Cerastium fontanum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Cerastium fontanum checklist entry.

E-Flora BC: Cerastium fontanum atlas page.

CalPhotos: Cerastium fontanum photos.

USDA Plants: Cerastium fontanum information.

38 photographs:
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