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Genus Rorippa Family Brassicaceae

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 
1Petals yellow; siliqua more or less inflated, less than 10 mm longRorippa palustris
Petals white; siliqua not inflated, more than 10 mm long2
2Plants stoloniferous, aquatic to semiaquatic3
Plants with a taproot, not aquatic, though sometimes growing in damp sites
                       Back to 1
4
3Seeds in 1 row per loculus, testa with c. 100 depressions per face; siliqua 15–30 mm longRorippa microphylla
Seeds in 2 rows per loculus, testa with 25–50 depressions per face; siliqua 10–18 mm long
                       Back to 2
Rorippa nasturtium-aquaticum
4All or at least lower leaves not lobed, margins entire or toothedRorippa gigantea
At least lower leaves deeply lobed, pinnatifid or pinnatisect
                       Back to 2
5
5Stamens 6; testa reticulate or tuberculateRorippa dictyosperma
Stamens 4; testa spongy
                       Back to 4
6
6Seeds rounded, in 2 rows, less than 0.75 mm longRorippa eustylis
Seeds slightly winged, in 1 row, more than 0.75 mm long
                       Back to 5
Rorippa laciniata

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