Leptopetalum biflorum (L.) Neupane & N.Wikstr., (Syn: Gerontogea racemosa (Lam.) Cham. & Schltdl.; Gonotheca biflora (L.) Masam.; Hedyotis alsinifolia Zipp. ex Span.; Hedyotis biflora (L.) Lam.; Hedyotis biflora var. uniflora Kurz; Hedyotis blumeana Steud.; Hedyotis burmanniana Schult.; Hedyotis debilis Roem. & Schult.; Hedyotis dichotoma Cav.; Hedyotis gracilis DC. [Illegitimate]; Hedyotis media Cav.; Hedyotis multiflora Cav.; Hedyotis paniculata (L.) Lam.; Hedyotis paniculata Rottler ex Wight & Arn. [Illegitimate]; Hedyotis racemosa Lam.; Hedyotis ramosissima Blume [Illegitimate]; Neanotis paniculata (L.) M.R.Almeida; Oldenlandia alata J.König ex Roxb.; Oldenlandia biflora L.; Oldenlandia brachypoda Zoll. ex Miq.; Oldenlandia dichotoma (Cav.) Willd. ex Cham. & Schltdl.; Oldenlandia multiflora (Cav.) DC.; Oldenlandia paniculata L.; Oldenlandia paniculata var. multiflora Miq.; Oldenlandia paniculata var. pygmaea Miq.; Oldenlandia radicans Roxb. ex Wight & Arn. [Invalid]; Thecagonum biflorum (L.) Babu) as per Catalogue of Life;      

Trop. & Subtrop. Asia to W. Pacific as per WCSP;
 
Bangladesh; Caroline Is.; China South-Central; China Southeast; Cook Is.; East
Himalaya
; Fiji; Gilbert Is.; Hainan; India; Jawa; Laccadive Is.; Malaya;
Maldives; Maluku; Marianas; Marshall Is.; Myanmar; Nansei-shoto; Nepal; New
Caledonia; New Guinea; Nicobar Is.; Niue; Philippines; Queensland; Samoa;
Solomon Is.; Sri Lanka; Sulawesi; Taiwan; Tonga; Vanuatu; Vietnam; Wallis-Futuna
Is.
as per Catalogue of Life;
Aquatic and Semi-aquatic Plants of the Lower Ganga Delta: Its Taxonomy … By Kumudranjan Naskar (Description & Keys- Oldenlandia biflora, Oldenlandia pumila, Oldenlandia diffusa, Oldenlandia corymbosa & Oldenlandia herbacea)  
 

Branched procumbent herbs; stem 4-angled. Leaves 1.2-3.5 x 0.4-1.5 cm, elliptic or ovate, base cuneate, apex acute, puberulous. Inflorescence axillary or mostly terminal cymes. Calyz 4-angled; lobes short, triangular, acute. Corolla white, c. 5 mm across, campanulate; tube c. 2 mm long, villous at throat; lobes 4, obovate. Stamens 4; anthers oblong. Capsule 4-angled, 3-4 x 2.5-3.5 mm, hispidulous, loculicidally dehiscent in the upper part. 

Flowering and fruiting: Throughout the year 
Weed in the plains 
Peninsular India and Sri Lanka 
(From India Biodiversity Portal (Oldenlandia biflora)


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Hooghly Today : Oldenlandia ? : Attachments (8).  4 posts by 2 authors.
This is a soft, glabrous, somewhat succulent, procumbent herb, about a ft high, found in a bamboo thicket.
Is it O. alata of FI. According to the Bengal Plants O. alata = O. paniculata L. = O. biflora L. of GRIN and The Plant List (not of FBI). ?


efi page on Oldenlandia biflora ?


I am not sure if the plant posted in the efI link you’ve pasted in this thread is a succulent one. So, the link, /species/m—z/r/rubiaceae/oldenlandia/oldenlandia-biflora, doesn’t help me.
According to the Bengal Plants O. paniculata L. is a diffuse or erect succulent weed. Dr. Prain equates it with O. alata of Flora Indica. 
O. alata is erect, four sided, leaves opposite, sub-sessile, elliptic, smooth, panicles terminal, corol campanulate……
Now, only experts can say if my plant has those above mentioned features.


I think appears close to Leptopetalum pteritum (Blume) Neupane & N.Wikstr. as per images, details and references herein.


I think more closer to images at Leptopetalum biflorum (L.) Neupane & N.Wikstr. rather than those at Leptopetalum pteritum (Blume) Neupane & N.Wikstr.


I agree with you   


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Hooghly – seems to be Oldenlandia paniculata L. : Attachments (5). 3 posts by 2 authors.
This one recorded this morning. (5.8.13).


efi page on Oldenlandia biflora ? (Syn. Oldenlandia paniculata L.)                                 


I am not sure of the eFI linked post, for corolla tube doesn’t seem to be short to me. The following links may help –



 

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Oldenlandia biflora L. SN Oct 43 : 1 post by 1 author. Attachments (3)
Oldenlandia biflora L., (= Hedyotis biflora (L.) Lam.),

ascending herb near moist localities from Chennai out skirts


 

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280619TH1- Photograph for Identification : 8 posts by 3 authors. Attachments (2)- 2 mb each. 

Please help me to identify this plant
This photo taken from Rajshahi city on 26/06/2019, Bangladesh.

Attachments (1) – 2 mb. 


Appears to be from Rubiaceae

Seems to be Oldenlandia biflora.

 

 

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270619TH1 Photograph for Identification : 3 posts by 2 authors. Attachments (2)- 2 Mb each. 
Please help me to identify this plant
26/06/2019, Natore, Bangladesh

Oldenlandia sp. or Could be O. biflora.

Rubiaceae.

Thanks, …, from id.
To me also appears close to images at Oldenlandia biflora

References:
Aquatic and Semi-aquatic Plants of the Lower Ganga Delta: Its Taxonomy … By Kumudranjan Naskar (Description & Keys- Oldenlandia biflora, Oldenlandia pumila, Oldenlandia diffusa, Oldenlandia corymbosaOldenlandia herbacea)  

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