Distribution: In the south-central counties of Washington; Washington south to California.
Habitat: Moist, sandy soil.
Flowers: May-August
Origin: Native
Conservation Status: Threatened in Washington (WANHP)
Rhizomatous perennial, with short, blunt hairs throughout, the freely-branched stems decumbent to erect, 1-4 dm. tall.
Leaves alternate, 3-7 cm. long, pinnatifid to lyrate pinnatifid, the lower ones petiolate, the upper sessile and auriculate, the segments ovate to oblong, often toothed.
Inflorescence of bractless racemes; pedicles spreading to ascending, 4-8 mm. long; sepals 4, persisting after flowering; petals 4, light yellow, 4 mm. long; stamens 6; style 1-2 mm. long, stigma entire.
Siliques oblong, 4-7 mm. long and 2-2.5 mm. broad, ascending to erect, somewhat curved, soft-pubescent; seeds in 2 series.
Publication: Fl. N.W. Amer. 40. 1897. (as Roripa). 1897.
Nasturtium sinuatum Nutt. var. columbiae S. Watson
Radicula columbiae (S. Watson) Greene
Rorippa calycina (Engelm.) Rydb. var. columbiae (S. Watson) Rollins [HC]
Rorippa sinuata (Nutt.) Hitchc. var. columbiae (S. Watson) Howell
PNW Herbaria: Specimen records of Rorippa columbiae in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Rorippa columbiae checklist entry.
E-Flora BC: Rorippa columbiae atlas page.
CalPhotos: Rorippa columbiae photos.
USDA Plants: Rorippa columbiae information.
