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This is a small plant from my backyard. I have found the flower closes in the evening.

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This plant belong to Malvaceae, and the yellow flowers open towards morning to mid-day.

This plant is most-likely Sida rhombifolia or may be Malvastrum tricuspidatum .

From broad leaves it seems not Sida acuta

Check epicalyx ( made up of bracteoles)... is there is no epicalyx then Sida rhombifolia. If epicalyx is 3, it is Malvastrum tricuspidatum

look also https://en.wikipedia.org/wiki/Sida_rhombifolia,

https://books.google.co.in/books?id=Roi0lwSXFnUC&lpg=PA258&ots=N7DNvrN4UL&dq=malvastrum%20tricuspidatum%203%20epicalyx&pg=PA258#v=onepage&q=malvastrum%20tricuspidatum%203%20epicalyx&f=false

Epicalyx of Malvastrum tricuspidatum :

Malvastrum tricuspidatum corolla calyx epicalyx

C= Corolla (all petals), K= Calyx (all sepals), E= Epicalyx the bracteole

3 bracteoles

3 bracteoles

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    $\begingroup$ I'd recommend adding an explanation of how to check the epicalyx and elaborating on 'if epicalyx is 3' (I know it's in the link but it's good practice to put this in the answer). $\endgroup$ – arboviral Aug 10 '16 at 8:31

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