Page authors: Don Knoke, David Giblin
Descurainia incisa
cut-leaved tansymustard

Distribution: Occurring chiefly east of the Cascades crest in Washington; Yukon Territory to California, east to the Rocky Mountains.

Habitat: Moderately dry forest openings and sagebrush desert.

Flowers: April-June

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Bees, flies


Sub-glabrous and greenish to stellate and grayish annual, the stems 2-10 dm. tall, usually branched and with stalked glands.


Leaves alternate, ovate to oblanceolate, 2-10 cm. long, the lower ones pinnate-pinnatifid, the ultimate segments 1-3 mm. broad, becoming pinnatifid and slightly toothed or lobed above.


Inflorescence of densely flowered, bractless racemes; pedicles slender, spreading to ascending, 4-8 mm. long; sepals 4, spreading, 1-2.5 mm. long; petals 4, pale to deep yellow, clawed, 1.5-3.5 mm. long; stamens 6; style 0.1-0.7 mm. long.


Siliques nearly straight, 5-17 mm. long and 1-1.5 mm. broad, appearing lumpy, tapered and acute at each end; seeds in 1 series.

Accepted Name:
Descurainia incisa (Engelm. ex A. Gray) Britton
Publication: Mem. Torrey Bot. Club. 5: 173. 1894.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Descurainia incisa in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Descurainia incisa checklist entry.

OregonFlora: Descurainia incisa information.

E-Flora BC: Descurainia incisa atlas page.

CalPhotos: Descurainia incisa photos.

USDA Plants: Descurainia incisa information.

42 photographs:
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