Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast; circumboreal.
Habitat: Marshes, shorelines, and other wet areas.
Flowers: June-October
Origin: Native
Growth Duration: Annual, Biennial, Perennial
Conservation Status: Not of concern
Pollination: Bees, flies, butterflies
Annual or biennial herbs, glabrous to stiff-hairy, the stems simple to freely-branched, erect, 3-10 dm. tall.
Leaves alternate, ovate-oblong to oblong-obovate, up to 17 cm. long, all pinnatifid or the upper merely toothed, slightly auriculate.
Inflorescence of bractless racemes; pedicles 4-12 mm. long, equaling the fruits; sepals 4, about 1.5 mm. long, not saccate at the base, falling off shortly after flowering; petals 4, light yellow, about 1 mm. long; stamens 6; style 0.5-1 mm. long.
Siliques ovate to oblong, spreading to ascending, mostly straight, 3-8 mm. long and 2-3 mm. broad; seeds in 2 series.
Publication: Enum. Pl. 27. (as Roripa). 1821.
Rorippa islandica (Oeder ex Murray) Borbás var. fernaldii Butters & Abbe [Peck]
Rorippa palustris (L.) Besser var. palustris [Rollins 1993a]
- ssp. hispida – hipsid bog yellowcress Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across the northern half of the U.S. and Canada to the Atlantic Coast.
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ssp. palustris – bog yellowcress
Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast; circumboreal.
PNW Herbaria: Specimen records of Rorippa palustris in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Rorippa palustris checklist entry
OregonFlora: Rorippa palustris information
E-Flora BC: Rorippa palustris atlas page
CalPhotos: Rorippa palustris photos
