Page authors: Ben Legler, David Giblin
Arenaria serpyllifolia
thyme-leaf sandwort

Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.

Habitat: Dry to moist, barren to wooded places.

Flowers: May-July

Origin: Introduced from Europe

Growth Duration: Annual

Conservation Status: Not of concern


Rough-hairy annual, glandular above, the 1-several slender stems erect to ascending, simple to freely-branched, 10-30 cm. tall.


Leaves opposite, ovate to lanceolate, 3-nerved, much shorter than the internodes, 3-7 mm. long and 1.5-4 mm. wide, short-petiolate.


Flowers several in an open, diffuse, leafy-bracteate inflorescence; pedicels up to 4 times as long as the flowers; sepals 5, lanceolate, pointed, 3 mm. long; petals 5, white, 2/3 as long as the sepals; stamens 10; styles 3.


Capsule ovoid, equaling the sepals, opening by 6 valves.

Accepted Name:
Arenaria serpyllifolia L.
Publication: Sp. Pl. 1: 423. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Arenaria serpyllifolia in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Arenaria serpyllifolia checklist entry.

OregonFlora: Arenaria serpyllifolia information.

E-Flora BC: Arenaria serpyllifolia atlas page.

CalPhotos: Arenaria serpyllifolia photos.

USDA Plants: Arenaria serpyllifolia information.

39 photographs:
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