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These are are weeds which grow on the silt of a lake, in India , climate is semi-tropical monsoonal first weed

enter image description here

They dont look native probably exotic species. What are they? Height is probably 1.5 feet.

Lake is this

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  • $\begingroup$ Is there any reason you don't believe they're native plants? $\endgroup$ – Jude Jul 4 '17 at 7:26
  • $\begingroup$ @Jude they are not found elsewhere except on lake bed everyear, moreover lake was constructed 50 yrs back , $\endgroup$ – murmansk Jul 4 '17 at 8:02
  • $\begingroup$ Please edit your question with the location (e.g. 1) what the lake name is, 2) what's the name of the river that drains into the lake, 3) the rough height of the plants). This would help a lot along with any other relevant details you can add. $\endgroup$ – Jude Jul 4 '17 at 17:41
  • $\begingroup$ Second one quite strongly seems to be Xanthium strumarium but the first (and foremost) one is confusing. Take a zoom close up of the inflorescence, if it contains small fruits (few mm) with 3 wedges (looks like [this]) then it could be Rumex dentatus $\endgroup$ – Always Confused Jul 5 '17 at 15:08
  • $\begingroup$ @AlwaysConfused make this as answer $\endgroup$ – murmansk Jul 5 '17 at 19:45
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As Always confused already suggested, the second picture is Xanthium strumarium.
This is a very variable species, and there is a lot of debate around splitting this species into (sub)species. There is a possibility this is plant belongs to one of the few accepted species that wikipedia lists, some even native to Eastern Asia. However, I can't verify this because pictures of these are scarce.

But from my personal field expierence, this plant looks exactly like the X. strumarium and the habitat also matches, so I am comfortable to call this X. strumarium.

As to your first plant: - It will be hard to say without a close-up of the flowers/seeds. - It would be better to ask only one plant per question, so please remove it here and ask a new question.

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