[Yellow Cress: The Genus Rorippa in the Columbia River Gorge of Oregon and Washington]

Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress

Rorippa palustris var. glabra

Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris

Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress: Rorippa palustris var. glabra (Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris)

Marsh yellowcress as seen on the cobbly Columbia River shoreline just east of the Sandy River Delta, Troutdale, Oregon.............September 8, 2012.

Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress: Rorippa palustris var. glabra (Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris)The photo at right shows one of the large leaves of the lower stem with coarse teeth towards its tip with entire margins on the lower two-thirds of the the blade. The lower leaf is more typical of one of the pinnately lobed leaves found higher on the stems.


Characteristics:

Yellow marshcress is an annual herb with erect, simple to branched stems from 40-100 cm tall. The herbage ranges from glabrous to having hairs on the stems. The leaves are highly variable, with the lower leaves pinnately divided while the smaller upper leaves have shallow lobes or irregular teeth along the margins. The lower leaves range up to 17 cm in length.

The inflorescence is a short raceme with the flower stalks up-curved and 3-12 mm long. The individual flowers have 4 yellowish petals, the petals spoon-shaped and from 1-2.5 mm long The fruits are egg-shaped siliques which range from 2-12 mm long and up to 3 mm wide. The siliques are spreading to ascending.


Habitat:

Yellow marshcress may be found in wet places along rivers and streams, in sloughs or on the shores of ponds and shallow lakes.


Range:

Yellow marshcress may be found across much of North America to the north of Mexico.


Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress: Rorippa palustris var. glabra (Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris) - Basal rosette of leaves of Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress: Rorippa palustris var. glabra (Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris)

Marsh yellowcress as seen (left) on the cobbly Columbia River shoreline just east of the Sandy River Delta, Troutdale, Oregon.............September 8, 2012. Note the grayish, perennial stem below the new flush of green growth which helps the plant survive between seasons during which the site is innundated by several feet of river water. The photo at right shows in a vernally moist swale several hundred meters uphill from the parking area at Catherine Creek, Columbia River Gorge............May2, 2014.

Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress: Rorippa palustris var. glabra (Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris) - Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress: Rorippa palustris var. glabra (Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris) - Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress: Rorippa palustris var. glabra (Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris)

Yellow marshcress found in a vernally moist swale several hundred meters uphill from the parking area at Catherine Creek, Columbia River Gorge............November 4, 2016.

Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress: Rorippa palustris var. glabra (Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris) - Fernald's Yellowcress, Marsh Yellowcress, Northern Marsh Yellowcress, Smooth Marsh Yellowcress, Yellow Bogcress: Rorippa palustris var. glabra (Synonyms: Rorippa hispida, Rorippa islandica ssp. fernaldiana, Rorippa islandica var. fernaldiana, Rorippa islandica var. glabra, Rorippa islandica var. glabrata,Rorippa islandica var. cernua, Rorippa islandica var. dictyota, Rorippa islandica var. glabra, Rorippa islandica var. glabrata, Rorippa palustris ssp. fernaldiana, Rorippa palustris ssp. glabra, Rorippa palustris ssp. occidentalis, Rorippa palustris var. occidentalis, Rorippa palustris ssp. palustris)

Yellow marshcress found in the dry water course of Catherine Creek in the Columbia River Gorge............May 13, 2000.

Paul Slichter