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Published In: Flora Carniolica 520. 1760. (Jun-Jul 1760) (Fl. Carniol.) Name publication detail

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: About 90 species, throughout the North Temperate zone; only 4 recorded from our area.


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Differs from Nasturtium R.Br. primarily by its small yellow flowers with short or reduced petals, erect habit and usually with a ± slender tap root.

Annual to perennial herbs of damp places, usually with a slender tap root or rootstock. Leaves pinnate to almost entire. Petals often about as long as the sepals, rarely absent. Stamens 6, rarely 4 (the outer pair abortive). Ovary oblong to suborbicular, many ovuled. Siliquae linear-cylindrical, ellipsoid or almost spherical, bilocular, dehiscent; valves convex, membranous, usually glabrous; septum membranous; seeds mostly biseriate, suborbicular, reddish-brown, with finely reticulated surface; radicle accumbent.


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1 Petals not exceeding the sepals or absent; flowers 2-2.5 mm across (2)
+ Petals distinctly exceeding the sepals; flowers c. 4 mm across Rorippa sylvestris
2 (1) Siliquae (10-) 15-20 (-25) mm long, 1-1.5 mm broad; seeds uni- or sub-biseraite; leaves almost simple, not or hardly lobed (3)
+ Siliquae 5-10 mm long, 2-2.5 mm broad; seeds conspicuously biseriate; lower and middle leaves pinnatifid, 3-5 jugate Rorippa islandica
3 (2) Plants tall robust; leaves somewhat more divided and toothed; ovules 100-150; seed c.0.5 mm long; siliquae 1.5 mm broad; (annual or biennial) Rorippa indica
+ Plants less robust; leaves less divided, slightly toothed or almost entire; ovules 50-90; seed c. 0.7 mm long; siliquae 1 mm broad; (perennial) Rorippa montana
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