Rorippa

Rorippa benghalensis (DC.) H. Hara ((ii) flowers without bracts = N. indicum DC. (now syn. of Rorippa indica (L.) Hiern)
iii) flowers with bracts – N. indicum var. benghalense (now syn. of Rorippa benghalensis (DC.) H. Hara))

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Rorippa dubia (Pers.) H.Hara (Keys and difference from R.indica as per Flora of China (Fruit straight, (1.5-)2.5-4 cm × 0.7-0.9(-1) mm; seeds uniseriate; petals mostly absent, if present then often shorter than sepals and 1.5-2.5 × 0.2-0.7(-1)))

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Rorippa indica (L.) Hiern ( ii) flowers without bracts = N. indicum DC. (now syn. of Rorippa indica (L.) Hiern)
iii) flowers with bracts – N. indicum var. benghalense (now syn. of Rorippa benghalensis (DC.) H. Hara))

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Rorippa palustris is easily differentiated from R. indica by its broader much shorter fruits, usually less than 1 cm long. The fruits of latter are 10-15 mm long and barely 1.5 mm broad.
Indian and Chinese specimens have often been confused with R. islandica (restricted o Europe…..according to GRIN and Fl. China) which differs in much smaller flowers with sepals and petals less than 1.5 mm long and fruit more than twice as long as pedicel.
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Rorippa sylvestris (L.) Besser – Easily differentiated from related species R. islandica and R. indica in larger flowers with petals distinctly longer than petals (nearly 1.5 times as long), narrower siliqua.
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According to Bengal Plants –
i) pods hardly longer than pedicels = Nasturtium palustre DC. (now syn. of Rorippa palustris (L.) Besser)
ii) flowers without bracts = N. indicum DC. (now syn. of Rorippa indica (L.) Hiern)
iii) flowers with bracts – N. indicum var. benghalense (now syn. of Rorippa benghalensis (DC.) H. Hara)
In addition to above Fl. Br. Ind. has –
iv) N. montanum Wall. (now syn. of Rorippa indica (L.) Hiern) = less robust than N. indicum, with smoother & less divided leaves, slender pods 1 to 1.5 inch (0.5 to 0.75 in. in N. indicum); can be found in Sikkim to Punjab. Khasia hills
v) N. officinale Br. (now accepted name Nasturtium officinale R.Br.) = aquatic
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From Floral Database of Tamilnadu :

Binomial Habit Notes Ref. Distrib.
Rorippa indica (L.) Hiern  Erect Herb Western Ghats
& Eastern Ghats, Native of Eurasia		 Flora of Tamil
Nadu, VOL. I, 1983; Gamble, 1957		 Coimbatore,
Namakkal, Nilgiri, Tiruvanna malai
Rorippa nasturtium – aquaticum (L.) Hayek (syn. of Nasturtium officinale) Aquatic
Herb		 Western
Ghats, Cultivated, Native of Mediterra nean Region		 Flora
of Tamil Nadu, VOL. I, 1983		 Dindigul,
Nilgiri		  
Botanical name Synonyms Family Common name
Rorippa indica Nasturtium indicum, Sisymbrium indicum Brassicaceae Indian Field-Cress
Rorippa palustris Sisymbrium amphibium var. palustre, Rorippa islandica Brassicaceae Marsh Yellow Cress
Rorippa sylvestris Cardamine silvestris, Brassicaceae Yellow Fieldcress
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Details with keys-

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Flora of Davanagere District, Karnataka, India By B. K. Manjunatha, V. Krishna, T. Pullaiah-Details- 2004-
Rorippa indica

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Flora of Medak District, Andhra Pradesh, India By T. Pullaiah, Chintala Prabhakar, B. Ravi Prasad Rao-1998- Details-
Rorippa indica

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Flora of Madhya Pradesh: Chhatarpur and Damoh By G. P. Roy, B. K. Shukla, Bhaskar Datt- 1992- Details-
Rorippa indica

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Rorippa : 1 post by 1 author.

I have updated eFI (efloraofindia) page on Rorippa

Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links as far as possible.

Species discussed so far in efloraofindia are given at the bottom of the page in the form of links against Subpages. On clicking them one can see all the details.

Any comments are welcome.