Page author: David Giblin
Rorippa curvisiliqua
western yellowcress

Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Colorado.

Habitat: Stream banks, pond edges, and seasonally wet soils, low to mid-elevations in the mountains

Flowers: May-September

Origin: Native

Growth Duration: Annual, Biennial

Conservation Status: Not of concern

Pollination: Bees, flies, butterflies


Mostly glabrous annual or biennial herbs, the stems 1-4 dm. tall, diffusely branched to simple and branched only above.


Leaves variable, 2-7 cm. long, mostly oblong-oblanceolate, entire, toothed, pinnately parted or pinnatifid, the segments linear to ovate, entire or toothed.


Inflorescence of bractless racemes; pedicles spreading, 2-4 mm. long; sepals 4, 1-2 mm. long; petals 4, yellow, 1-2 mm. long; stamens 6; style 0.3-1 mm. long.


Siliques 6-15 mm. long and 1-1.5 mm. broad, nearly terete, usually curved; seeds in 2 series.

Accepted Name:
Rorippa curvisiliqua (Hook.) Bessey ex Britton
Publication: Mem. Torrey Bot. Club. 5: 169. 1894.

Synonyms & Misapplications:
Nasturtium curvisiliqua (Hook.) Nutt.
Rorippa curvisiliqua (Hook.) Bessey ex Britton var. curvisiliqua [HC]
Rorippa curvisiliqua (Hook.) Bessey ex Britton var. lyrata (Nutt.) C.L. Hitchc. [HC]
Rorippa curvisiliqua (Hook.) Bessey ex Britton var. nuttallii (S. Watson) Stuckey [KZ99]
Rorippa curvisiliqua (Hook.) Bessey ex Britton var. orientalis Stuckey [KZ99]
Rorippa curvisiliqua (Hook.) Bessey ex Britton var. procumbens Stuckey [KZ99]
Sisymbrium curvisiliqua Hook.
Additional Resources:

PNW Herbaria: Specimen records of Rorippa curvisiliqua in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Rorippa curvisiliqua checklist entry

OregonFlora: Rorippa curvisiliqua information

E-Flora BC: Rorippa curvisiliqua atlas page

CalPhotos: Rorippa curvisiliqua photos

63 photographs:
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