Description: Annual, biennial or perennial herbs, usually glabrous, some aquatic.
Leaves simple to pinnate.
Flowers in racemes. Sepals dimorphic, inner pair saccate. Stamens usually 6, sometimes 4. Stigma 2-lobed to capitate.
Siliqua generally linear, beakless; valves convex, the midvein ± inconspicuous; seeds usually in 2 rows per loculus, sometimes mucilaginous when wet, testa reticulate or spongy.
Distribution and occurrence: World: 70 species, cosmopolitan. Australia: 7 species (4 species endemic, 3 species naturalized), all States.
Text by L. Retter & G.J. Harden, Flora of New South Wales Vol. 1: 478-480 (1990)
Taxon concept: Australian Plant Census (accessed May 2017)
| ||Key to the species|| |
|1||Petals yellow; siliqua more or less inflated, less than 10 mm long||Rorippa palustris|
|Petals white; siliqua not inflated, more than 10 mm long||2|
|2||Plants stoloniferous, aquatic to semiaquatic||3|
|Plants with a taproot, not aquatic, though sometimes growing in damp sites|
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|3||Seeds in 1 row per loculus, testa with c. 100 depressions per face; siliqua 15–30 mm long||Rorippa microphylla|
|Seeds in 2 rows per loculus, testa with 25–50 depressions per face; siliqua 10–18 mm long|
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|4||All or at least lower leaves not lobed, margins entire or toothed||Rorippa gigantea|
|At least lower leaves deeply lobed, pinnatifid or pinnatisect|
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|5||Stamens 6; testa reticulate or tuberculate||Rorippa dictyosperma|
|Stamens 4; testa spongy|
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|6||Seeds rounded, in 2 rows, less than 0.75 mm long||Rorippa eustylis|
|Seeds slightly winged, in 1 row, more than 0.75 mm long|
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