Page author: David Giblin
Euclidium syriacum
euclidium, Syrian mustard

Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Rocky Mountains, also along the coast in northeastern U.S.

Habitat: Fields, roadsides, and other disturbed areas.

Flowers: May-June

Origin: Introduced from Eurasia

Growth Duration: Annual, Biennial

Conservation Status: Not of concern

Pollination: Bees, flies, butterflies


Freely-branched annual, strongly pubescent with forked hairs, the stem 1-4 dm. tall.


Leaves all cauline, alternate, short-petiolate, oblong-oblanceolate, 2-5 cm. long, remotely dentate.


Flowers sub-sessile in open, spike-like racemes; pedicles stout, 1 mm. long; sepals 4, not saccate; petals 4, white, spatulate, 1 mm. long, rounded or very shallowly notched; stamens 6; style stout, beaklike, nearly as long as the silicle.


Silicles obovoid, 2-3 mm. long, covered with pungent hairs.

Accepted Name:
Euclidium syriacum (L.) W.T. Aiton
Publication: Hortus Kew. 4: 74. 1812.

Synonyms & Misapplications:
Anastatica syriaca L.
Bunias syriaca (L.) M. Bieb.
Additional Resources:

PNW Herbaria: Specimen records of Euclidium syriacum in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Euclidium syriacum checklist entry

OregonFlora: Euclidium syriacum information

E-Flora BC: Euclidium syriacum atlas page

CalPhotos: Euclidium syriacum photos

17 photographs:
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