UW Burke Herbarium species comparison

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Rorippa palustris

Rorippa dubia

hispid yellowcress, marsh yellowcress
Habit 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.

Rorippa palustris

Rorippa dubia
Flowering time June-October
Habitat Marshes, shorelines, and other wet areas.
Distribution
Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast; circumboreal.
[WildflowerSearch map]
[BONAP county map]
[BONAP county map]
Origin Native
Conservation status Not of concern
Sibling taxa
R. austriaca, R. columbiae, R. curvipes, R. curvisiliqua, R. sinuata, R. sphaerocarpa, R. sylvestris, R. tenerrima
R. austriaca, R. columbiae, R. curvipes, R. curvisiliqua, R. palustris, R. sinuata, R. sphaerocarpa, R. sylvestris, R. tenerrima
Subordinate taxa
R. palustris ssp. hispida, R. palustris ssp. palustris
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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