Page author: David Giblin
Rorippa palustris
hispid yellowcress, marsh yellowcress
WTU specimens
Other herbaria

Distribution: Widely distributed throughout Washington; common throughout North America.

Habitat: Wet ground and low elevations.

Flowers: June-October

Origin: Native

Conservation Status: Not of concern

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
Publication: Enum. Pl. 27. 1821. (as Roripa).

Synonyms & Misapplications:
Rorippa islandica (Oeder ex Murray) Borbás, misapplied [HC]
Rorippa islandica (Oeder ex Murray) Borbás var. fernaldii Butters & Abbe [Peck]
Rorippa palustris (L.) Besser var. palustris [Rollins 1993a]
Infraspecies:
ssp. hispida – hispid yellowcress, marsh yellowcress
ssp. palustris – hispid yellowcress, marsh yellowcress
Additional Resources:

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

WA Flora Checklist: Rorippa palustris checklist entry.

E-Flora BC: Rorippa palustris atlas page.

CalPhotos: Rorippa palustris photos.

USDA Plants: Rorippa palustris information.

25 photographs:
Group by