Page authors: Don Knoke, David Giblin
Euphorbia serpillifolia
thyme leaved spurge

Distribution: Chiefly east of the Cascades in Washington; British Columbia south to Baja California, east to Alberta and Texas.

Habitat: Dry ground from the plains to the lower mountains.

Flowers: May-September

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern


Monoecious, glabrous annuals with freely-branched, prostrate stems 0.5-3 dm. long.


: Leaves opposite, 5-15 mm. long, obliquely oblanceolate to oblong-ovate, serrulate near the tips; stipules lanceolate, 0.5-1.5 mm. long, usually lacerate.


Flowers tiny, monoecious, borne in axillary involucres; staminate flowers numerous, naked, each consisting of a single stamen; pistillate flower single and terminal in the involucre; involucre bearing 4 glands with sunken centers, separated by lobed, whitish appendages.


Capsules smooth, 1.5-2 mm. long; seeds 1.2 mm. long, grayish-brown, prismatic.

Accepted Name:
Euphorbia serpillifolia Pers.
Publication: Syn. Pl. 2: 14. 1806.

Synonyms & Misapplications:
Euphorbia serpyllifolia Pers., orthographic variant [HC]
Additional Resources:

PNW Herbaria: Specimen records of Euphorbia serpillifolia in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Euphorbia serpillifolia checklist entry.

E-Flora BC: Euphorbia serpillifolia atlas page.

CalPhotos: Euphorbia serpillifolia photos.

USDA Plants: Euphorbia serpillifolia information.

22 photographs:
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