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Vascular Plants of California
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Rorippa palustris subsp. palustris

Higher Taxonomy
Family: Brassicaceae (Cruciferae)View DescriptionDichotomous Key
Habit: Annual to shrub; sap pungent, watery. Leaf: generally simple, alternate; generally both basal, cauline; stipules 0. Inflorescence: generally raceme, generally not bracted. Flower: bisexual, generally radial; sepals 4, generally free; petals (0)4, forming a cross, generally white or yellow to purple; stamens generally 6 (2 or 4), 4 long, 2 short (3 pairs of unequal length); ovary 1, superior, generally 2-chambered with septum connecting 2 parietal placentas; style 1, stigma entire or 2-lobed. Fruit: capsule, generally 2-valved, "silique" (length >= 3 × width) or "silicle" (length < 3 × width), dehiscent by 2 valves or indehiscent, cylindric or flat parallel or perpendicular to septum, segmented or not. Seed: 1--many, in 1 or 2 rows per chamber, winged or wingless; embryo strongly curved.
Genera In Family: +- 330 genera, 3780 species: worldwide, especially temperate. Note: Highest diversity in Mediterranean area, mountains of southwestern Asia, adjacent central Asia, western North America; some Brassica species are oil or vegetable crops; Arabidopsis thaliana used in experimental molecular biology; many species are ornamentals, weeds. Aurinia saxatilis (L.) Desvaux in cultivation only. Aubrieta occasional waif in central NCoR, Carrichtera annua (L.) DC. in SCo, Iberis sempervirens L., Iberis umbellata L. in PR, Teesdalia coronopifolia (Bergeret) Thell., Teesdalia nudicaulis (L.) W.T. Aiton in southern NCoRO, CCo. Cardaria, Coronopus moved to Lepidium; Caulostramina to Hesperidanthus; Guillenia to Caulanthus; Heterodraba to Athysanus; California taxa of Lesquerella to Physaria; Malcolmia africana to Strigosella.
eFlora Treatment Author: Ihsan A. Al-Shehbaz, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: RorippaView DescriptionDichotomous Key

Habit: Annual to perennial herb, occasionally with caudex or rhizome; hairs simple or 0. Stem: prostrate to erect, branched or not, leafy. Leaf: basal rosetted or not, simple, entire or dentate to 1--3-pinnately divided; cauline petioled or sessile, generally lobed to sagittate at base, entire to dentate or pinnately lobed. Inflorescence: elongated or congested; bracts 0 [rarely throughout]. Flower: sepals erect to spreading, base not sac-like, generally deciduous (persistent); petals present (vestigial or 0), yellow [white or pink], generally not clawed. Fruit: silique, linear or narrowly oblong, or silicle, spheric to ovoid or broadly oblong; dehiscent, unsegmented; stigma entire or +- 2-lobed. Seed: 10--300, 1(2) row(s) per chamber, generally wingless.
Etymology: (Latinized Old Saxon: for these or perhaps other crucifers) Note: Other taxa in TJM (1993) moved to Nasturtium.
eFlora Treatment Author: Ihsan A. Al-Shehbaz
Reference: Al-Shehbaz & Price 1998 Novon 8:124--126
Unabridged Reference: Stuckey 1972 Sida 4:277--340
Species: Rorippa palustrisView Description 

Habit: Annual (short-lived perennial herb), glabrous or bristly. Stem: erect, branched distally, (0.5)1--10(14) dm. Leaf: basal rosetted, early-deciduous, pinnately divided; cauline (1.5)2.5--10(18) cm, petioled or +- sessile, base lobed to clasping; lateral lobes oblong or ovate, +- entire to dentate. Inflorescence: elongated. Flower: sepals erect, 1.5--2.4(2.6) mm, oblong; petals (1.5)1.8--2.5(3) mm, 0.5--1.5(2) mm wide, spoon-shaped. Fruit: silicle (silique), (2.5)4--10 mm, (1.5)1.7--3(3.5) mm wide, oblong to ellipsoid, generally +- curved; valves glabrous; style 0.2--1(1.2) mm; pedicel spreading to reflexed, (2.5)3--10(14) mm, slender, straight or curved. Seed: 20--90, 0.5--0.9 mm, ovoid to +- spheric. Chromosomes: 2n=32.
Note: Highly variable.
Unabridged Note: With artificially defined taxa recognized by Stuckey (1972) as 11 varieties into 4 subspecies
Rorippa palustris (L.) Besser subsp. palustris
Stem: glabrous (sparsely hairy proximally). Leaf: glabrous abaxially.
Ecology: Generally wet places; Elevation: < 3200 m. Bioregional Distribution: CA; Distribution Outside California: North America. Flowering Time: Mar--Sep
Synonyms: Rorippa palustris var. occidentalis (S. Watson) Rollins; Rorippa palustris subsp. fernaldiana (Butters & Abbe) Jonsell; Rorippa palustris var. fernaldiana (Butters & Abbe) Stuckey; Rorippa palustris subsp. occidentalis (S. Watson) Abrams
Jepson eFlora Author: Ihsan A. Al-Shehbaz
Reference: Al-Shehbaz & Price 1998 Novon 8:124--126
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Rorippa palustris subsp. palustris

botanical illustration including Rorippa palustris subsp. palustris


Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Rorippa palustris subsp. palustris, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on February 09, 2023.

Citation for the whole project: Jepson Flora Project (eds.) 2023, Jepson eFlora,, accessed on February 09, 2023.

Rorippa palustris subsp. palustris
click for enlargement
© 2009 Neal Kramer
Rorippa palustris subsp. palustris
click for enlargement
© 2009 Neal Kramer
Rorippa palustris subsp. palustris
click for enlargement
© 2011 Barry Breckling
Rorippa palustris subsp. palustris
click for enlargement
© 2019 Neal Kramer
Rorippa palustris subsp. palustris
click for enlargement
© 2011 Barry Breckling
Rorippa palustris subsp. palustris
click for enlargement
© 2007 Neal Kramer

More photos of Rorippa palustris subsp. palustris in CalPhotos

Geographic subdivisions for Rorippa palustris subsp. palustris:
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).