Rorippa palustris (L.) Besser

Family: Brassicaceae

Pertinent Synonyms & Notes (particularly those used in California; go to GRIN for other synonyms)

Sisymbrium amphibium L. var. palustre L.

Pertinent Common Names (particularly those used in California; go to GRIN for other common names)

marsh yellowcress

Primary Disseminule Type


Description (diagnostics are in brown)

Fruit a multi-seeded dehiscent silique or silicle, oblong to broadly elliptical, only slightly compressed, straight ro slightly curved, glabrous, (0.3)0.4–1 cm long x 1.5–3(3.5) mm wide x ca. 2–3 mm thick, without conspicuous beak. Style remnant 0.2–1 mm long.

Seed ± round to obovate or cordate in outline, partially compressed, cross-section oblong or ovate to irregularly lumpy, 0.5–0.8(1) mm long x 0.4–0.6(0.8) mm wide x 0.3–0.5 mm thick, Surface light yellowish-brown but somewhat darker in hilar region, sparkly to shiny (under magnification), minutely papillate-bubbly (colliculate), irregularly indented between the radicle and cotyledons.

Hilum in a prominent notch bordered on one side by the prominent incurved tip of the radicle, funicular remnant (when present) lighter brown.

Embryo bent, cotyledons accumbent, endosperm lacking.

Similar Species

Rorippa curvisiliqua

Risk Assessment (codes in yellow or red indicate cause for concern; assessments are current as of mid-2011; click AUQP, NZBORIC, or NZBPI for access to the most recent versions of these databases and possible assessment changes)