Vascular Plants - Brassicaceae - Rorippa:
Rorippa palustris
Page Author: David Giblin
bog yellowcress, marsh or hispid yellowcress 
Blooms: June-October
Habit: herb
Duration: annual,biennial,perennial
Origin: Native
Conservation Status: Abundant; of no concern.

Distribution: Widely distributed throughout Washington; common throughout North America.
Habitat: Wet ground and low elevations.
Species Description:

General: Annual or biennial herbs, glabrous to stiff-hairy, the stems simple to freely-branched, erect, 3-10 dm. tall.
Leaves: Leaves alternate, ovate-oblong to oblong-obovate, up to 17 cm. long, all pinnatifid or the upper merely toothed, slightly auriculate.
Flowers: 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.
Fruits: Siliques ovate to oblong, spreading to ascending, mostly straight, 3-8 mm. long and 2-3 mm. broad; seeds in 2 series.
Accepted Name:
Rorippa palustris (L.) Besser
Synonyms:
Rorippa islandica (Oeder ex Gunneras) Borbás
Rorippa islandica (Oeder ex Gunneras) Borbás var. fernaldii Butters & Abbe
Rorippa islandica (Oeder ex Gunneras) Borbás var. glabrata (Lunell) Butters & Abbe
Rorippa islandica (Oeder ex Gunneras) Borbás var. hispida (Desv.) Butters & Abbe
Rorippa islandica (Oeder ex Gunneras) Borbás var. islandica
Rorippa islandica (Oeder ex Gunneras) Borbás var. occidentalis (Desv.) Butters & Abbe
Rorippa palustris (L.) Besser ssp. fernaldiana (Butters & Abbe) Jonsell
Rorippa palustris (L.) Besser ssp. hispida (Desv.) Jonsell
Rorippa palustris (L.) Besser ssp. occidentalis (S. Watson) Abrams
Rorippa palustris (L.) Besser var. fernaldiana (Butters & Abbe) Stuckey
Rorippa palustris (L.) Besser var. hispida (Desv.) Rydb.
Rorippa palustris (L.) Besser var. occidentalis (S. Watson) Rollins
Rorippa palustris (L.) Besser var. palustris

Treated in Flora of the PNW as:
Rorippa islandica
Additional Resources:

PNW Herbaria Specimens: View list of Rorippa palustris specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Rorippa palustris specimens in the WTU Herbarium database.

Washington Flora Checklist: Rorippa palustris treatment.

E-Flora BC: Rorippa palustris atlas page.

CalPhotos: Rorippa palustris images.

USDA Plants Database: Rorippa palustris.
Additional photographs of Rorippa palustris:
(click on a thumbnail to view larger photo)

Ben Legler, 2004

Ben Legler, 2004

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Robert L. Carr, 2009

Robert L. Carr, 2009

Robert L. Carr, 2009

Robert L. Carr, 2009

Robert L. Carr, 2009

G. D. Carr, 2009

G. D. Carr, 2009

G. D. Carr, 2009

G. D. Carr, 2009

G. D. Carr, 2009

G. D. Carr, 2012

G. D. Carr, 2012

G. D. Carr, 2012
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Washington Native Plant Society
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