Burke: Rorippa tenerrima vs. Rorippa columbiae

	Rorippa tenerrima	Rorippa columbiae
	Modoc yellowcress	Columbia yellowcress cress
Habit		Rhizomatous perennial, with short, blunt hairs throughout, the freely-branched stems decumbent to erect, 1-4 dm. tall.
Leaves		Leaves alternate, 3-7 cm. long, pinnatifid to lyrate pinnatifid, the lower ones petiolate, the upper sessile and auriculate, the segments ovate to oblong, often toothed.
Flowers		Inflorescence of bractless racemes; pedicles spreading to ascending, 4-8 mm. long; sepals 4, persisting after flowering; petals 4, light yellow, 4 mm. long; stamens 6; style 1-2 mm. long, stigma entire.
Fruits		Siliques oblong, 4-7 mm. long and 2-2.5 mm. broad, ascending to erect, somewhat curved, soft-pubescent; seeds in 2 series.

	Rorippa tenerrima	Rorippa columbiae
Flowering time	June-August	May-August
Habitat	Lakeshores and other wet areas, lowland to montane.	Stream banks and gravel bars, pond margins, meadows, and roadsides.
Distribution	Occurring east of the Cascades crest in Washington; British Columbia to California, east to the central U.S. [WildflowerSearch map] [BONAP county map]	Occurring east of the Cascades crest in south-central Washington; Washington to California. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Threatened in Washington (WANHP)
Sibling taxa	R. austriaca, R. columbiae, R. curvipes, R. curvisiliqua, R. palustris, R. sinuata, R. sphaerocarpa, R. sylvestris	R. austriaca, R. curvipes, R. curvisiliqua, R. palustris, R. sinuata, R. sphaerocarpa, R. sylvestris, R. tenerrima
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Rorippa tenerrima

Rorippa columbiae

Modoc yellowcress

Columbia yellowcress cress

Habit

Rhizomatous perennial, with short, blunt hairs throughout, the freely-branched stems decumbent to erect, 1-4 dm. tall.

Leaves

Leaves alternate, 3-7 cm. long, pinnatifid to lyrate pinnatifid, the lower ones petiolate, the upper sessile and auriculate, the segments ovate to oblong, often toothed.

Flowers

Inflorescence of bractless racemes; pedicles spreading to ascending, 4-8 mm. long;

sepals 4, persisting after flowering;

petals 4, light yellow, 4 mm. long;

stamens 6;

style 1-2 mm. long, stigma entire.

Fruits

Siliques oblong, 4-7 mm. long and 2-2.5 mm. broad, ascending to erect, somewhat curved, soft-pubescent;

seeds in 2 series.