Page author: David Giblin
Conringia orientalis
hare's-ear mustard, treacle mustard

Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.

Habitat: Roadsides, waste places, and other disturbed areas.

Flowers: May-August

Origin: Introduced from Eurasia

Growth Duration: Annual

Conservation Status: Not of concern


Glabrous, glaucous annual, the simple stem 3-7 dm. tall.


Basal leaves obovate to oblanceolate, narrowed gradually to the base, entire, 5-9 cm. long; cauline leaves alternate, oblong-lanceolate, sessile and cordate-clasping.


Inflorescence a few-flowered, flat-topped, bractless raceme, becoming elongate and loose; pedicles ascending, 10-15 mm. long; sepals 4, erect, 6-8 mm. long, acute, the lateral pair basally saccate; petals 4, cream to lemon, 7-12 mm. long, slenderly clawed, the blades narrowly obovate; stamens 6; style thick, 1 mm. long.


Siliques linear, terete, 8-13 cm. long and 1.5-2 mm. thick, tapered to a slender tip.

Accepted Name:
Conringia orientalis (L.) Dumort.
Publication: Fl. Belg. 123. 1827.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Conringia orientalis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Conringia orientalis checklist entry.

E-Flora BC: Conringia orientalis atlas page.

CalPhotos: Conringia orientalis photos.

USDA Plants: Conringia orientalis information.

31 photographs:
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