Page authors: Don Knoke, David Giblin
Dysphania ambrosioides
Mexican tea, wormseed

Distribution: Occurring in scattered locations in Washington; native to southeastern U.S., but introduced in scattered localities in central and western U.S.

Habitat: Roadsides and waste areas, riparian zones, tolerant of alkaline.

Flowers: July-November

Origin: Introduced from southern North America and tropical America

Growth Duration: Annual

Conservation Status: Not of concern


Glandular and strongly aromatic annual or short-lived perennial, simple to freely-branched, erect, up to 1 m. tall, covered with sessile yellow glands and often pubescent.


Leaves alternate, the blades rhombic-ovate to lanceolate, up to 10 cm. long, strongly wavy-pinnatifid to wavy-dentate, narrowed to short, slender petioles, gradually reduced and often entire and bract-like above.


Flowers sessile and glomerate in small spikes borne in panicles in the leaf axils; perianth glabrous, 5-lobed over half the length; stamens 5, opposite the perianth lobes; styles 2.


Seed 1, lenticular, horizontal, 0.8 mm. in diameter.

Accepted Name:
Dysphania ambrosioides (L.) Mosyakin & Clemants
Publication: Ukrayins’k. Bot. Zhurn., n. s. 59: 382. 2002. 2002.

Synonyms & Misapplications:
Chenopodium ambrosioides L. [HC]
Teloxys ambrosioides (L.) W.A. Weber
Additional Resources:

PNW Herbaria: Specimen records of Dysphania ambrosioides in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Dysphania ambrosioides checklist entry.

OregonFlora: Dysphania ambrosioides information.

E-Flora BC: Dysphania ambrosioides atlas page.

CalPhotos: Dysphania ambrosioides photos.

USDA Plants: Dysphania ambrosioides information.

29 photographs:
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