Nechamandra alternifolia

This species is found in southern China, Bangladesh, India, Nepal, Sri Lanka, Myanmar and Viet Nam. It has been declared as a noxious weed in North America.
This aquatic hydrogeophyte occurs in ponds, lakes and slow-moving rivers and channels. It grows as a submerged stem plant which is attached to the substrate.
(From  IUCN Red List (LC))
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Nechamandra alternifolia (Roxb.) Thw. Hydrocharitaceae is reported from Tamilnadu

Thanks for confirming …

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Herb from Medinipur: 2 images.
Please help me to identify this plant. Is it any species of Najas ?
Date/Time- 15/04/2021
Location- Place, Altitude, GPS- West Medinipur, West Bengal
Habitat- Wild Aquatic
Plant Habit- Herb
Leaves Size- 6.5 cm long
Flowers – White Colour., About 2.5 cm long
Other Information – pollen and floral parts are found scattered all around the water.

Najas,

I agree with you … for Najus,

New in this amazing group. Didn’t know how to give plant ID. Please let me know the process.

Initially observe the plant carefully entire profile (with Description), then study and understand the etymology after these two steps definitely we will identify any plant with literature. In identification, we will do mistakes at the initial stage of learning even 100 % match with literature, but that know with years of genuine experience only,

Nechamandra alternifolia

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Contribution of species Nechamandra alternifolia: 1 high res. image.
Rare aquatic plant of a monotype species found only in India. Resembles Najas or Ceratophyllum, grows in stagnant fresh water.
https://en.wikipedia.org/wiki/Nechamandra

Very nice. Are you growing this for research purpose ?

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References: The Plant List Ver.1.1 WCSP  GRIN  Flora of China  Annotated checklist of Flowering plants of Nepal  India Biodiversity Portal  IUCN Red List (LC)  Dave’s Garden Flora of Medak District, Andhra Pradesh, India By T. Pullaiah, Chintala Prabhakar, B. Ravi Prasad Rao (1998)