Echinodorus palifolius (Nees & Mart.) J.F.Macbr. , Publ. Field Mus. Nat. Hist., Bot. Ser. 11: 4 1931. (Syn. Alisma ellipticum Mart. ex Schult.f. .; Alisma nathpurense Steud.; Alisma palifolium (Nees & Mart.) Kunth; Alisma virgata Hook. & Arn.; Echinodorus ellipticus (Mart. ex Schult.f.) Micheli ..; Echinodorus palaefolius (Nees & Mart.) Herter ..; Echinodorus piauhyensis Kasselm.; Echinodorus virgatus (Hook. & Arn.) Micheli; Sagittaria palifolia Nees & Mart. ....); 

ID170509phk 1 :  Attachments (2). 5 posts by 4 authors.

Id pl. a aquatic plant photographed at Go Green nursery, Karnala

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It is Hydrocharis morsus-ranae.

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I think this could be the native species Hydrocharis dubia. Leaves of Hydrocharis dubia can be ovate also, like the one seen in ... picture. If I am not wrong, Hydrocharis morsus-ranae has only kidney- shaped leaves.
Not sure though...

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I had almost assumed this to be a Hydrocharis, but somehow the leaves did not agrees.
It is actually another plant from the same family: Swamp Lily (Ottelia ovalifolia)
http://www.flowersofindia.net/catalog/slides/Swamp%20Lily.html

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Echinodorus palaefolius in view of changed link given by ... at http://www.flowersofindia.net/catalog/slides/Swamp%20Lily.html  

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Jijamata Udyan, Aug 2014 :: Echinodorus palaefolius :: ARKOCT-15 : 1 post by 1 author. Attachments (4).

Yes it is Echinodorus palaefolius

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wiki essay says introduced in to India from Mexico

Echinodorus palifolius (Nees & Mart.) J.F.Macbr. : 2 posts by 2 authors. Attachments (3)

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Plant identification 1 : 3 posts by 1 author. Attachments (1)- 2 MB. 

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Echinodorus palifolius (Nees & Mart.) J.F.Macbr. ??  

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Echinodorus palifolius is right. Thank you very much ...