Garg ji,
   The flowers in the image are actually solitary in leaf axils. They
deceptively look like in a corymb. In *Oldenlandia corymbosa *the corymb
itself is carried on a peduncle. See the images on POWO
<https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:757791-1/images>
to see how the corymbs in O. corymbosa look like.  Moreover, while *Oldenlandia
corymbosa *is an erect plant, *Oldenlandia pumila *is by and large
prostrate.
   Tabish

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On Thu, Aug 10, 2023 at 5:34 PM J.M. Garg <[email protected]> wrote:

> I think it should be *Oldenlandia corymbosa* only as per keys at Aquatic
> and Semi-aquatic Plants of the Lower Ganga Delta
> <https://www.google.co.in/books/edition/Aquatic_and_Semi_aquatic_Plants_of_the_L/KwkDI9qKyJ8C?hl=en&gbpv=1&dq=Oldenlandia+pumila&pg=PA145&printsec=frontcover>,
> which is based on leaves:
> Leaves elliptic, about 2 times as long as broad. for O.pumila and Leaves
> usually linear, about 4-10 times as long as broad in O.corymbosa.
> Regarding inflorescences, For O.corymbosa, Flora of China
> <http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242324555>
> says 'Inflorescence axillary, 1-flowered or usually cymose and
> 2-5-flowered, glabrous, pedunculate; peduncles 1(or 2) per axil, filiform,
> 1-16 mm; ...' (Flowers axillary, 1-4, rarely many. Peduncle 10-15 mm
> long, glabrous. Pedicel c. 4-5 mm long, enlarged in fruit as per Flora of
> Pakistan
> <http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=220009414>).
> For O.pumila, IBP <https://indiabiodiversity.org/species/show/244868>
> says 'Flowers axillary, opposite or alternate, solitary or in 2-flowered
> cymes; peduncle 0.7-1 cm long; pedicel 1-1.5 cm long'
>
>
> On Sun, 30 Jul 2023 at 00:44, Tabish <[email protected]> wrote:
>
>> This is Oldenlandia pumila. Oldenlandia corymbosa flowers are carried on
>> a *long peduncle*.
>>
>> http://www.flowersofindia.net/catalog/slides/Corymb%20Diamond%20Flower.html
>> There are some other misidentifications of Oldenlandia pumila on eFI.
>>    Tabish
>> On Monday, December 15, 2014 at 11:06:48 AM UTC+5:30 Gopal Shinde wrote:
>>
>>> Please help identify this weed spreading 1-1.5’.  Photo taken on
>>> 15Dec14 at Dhavlas, Maharashtra.
>>>
>>> Gopal
>>>
>>> --
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>>
>
>
> --
> With regards,
> J.M.Garg
>

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