Oldenlandia pumila (L.f.) DC., Prodr. 4: 425 1830. (syn: Hedyotis pumila L.f.; Oldenlandia crystallina Roxb.);
India to Malaya, Jawa: Andaman Is., Bangladesh, India, Jawa, Malaya, Myanmar, Sri Lanka, Thailand, Vietnam as per POWO;

Annual or perennial herbs, from long and woody root stock, usually branched near the base, branches diffuse procumbent to prostrate; stem acutely angular, minutely dentate on the ribs. Leaves opposite, subsessile, 0.7-1.8 x 0.1-0.6 cm, elliptic or elliptic-lanceolate, acute, narrowed at base to petiole, membranous, scabrid above along margin and midrib below, often crystalline dots present in the lower surface; stipules 2-3 mm x 0.5-2 mm with 2-5 bristles. Flowers axillary, opposite or alternate, solitary or in 2-flowered cymes; peduncle 0.7-1 cm long; pedicel 1-1.5 cm long, distinctly ribbed, denticulate along ribs. Hypanthium ovoid, 0.3-1 mm long; calyx limb very short; lobes 4, rarely 5, 0.5-0.6 mm long ovate-lanceolate or triangular, acute, dentate at margin. Corolla about 2 mm long, white; tube 1.2-1.3 mm long, pubescent at throat; lobes 4, 0.5-0.8 x 0.5-0.6 mm, ovate, acute, incurved at apex. Stamens 4, included; filament very short, 0.2-0.3 mm long, adnate to sinus of corolla lobes; anthers 0.3-0.4 cm long, oblong. Ovary 0.3-0.7 mm long; ovules many on submedian oblong placenta, style exserted, 1-1.3 mm long; stigma bilobed, fleshy, 0.3-0.5 mm long, tufted hairy. Capsule ellipsoid or oblong-ovoid, 2-3 x 2.5-3 mm, didymous distinctly ribbed, glabrous; seeds 30-40, 0.7 x 0.1 mm, angular; exotesta strongly reticulate, brownish.
Flowering and fruiting: April-May
(Attributions: Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi)

Need tiny white flower ID: 2 images.
Bhopal; black soil; 17/11/2021

Spermacoce articularis L.f. ??

No …, It’s Oldenlandia biflora,

Looks different from images at Leptopetalum biflorum, in particular fruits.
Also could not find a match as per comparative images at Oldenlandia
What are the species listed in the area?

Also does not matches with images at Neanotis

Can you tell what species of Oldenlandia are reported from your area to further check up?

Oldenlandia crystalliana??

Looks close to Oldenlandia pumila (L.f.) DC. !

Thanks, …, for the id. Oldenlandia crystallina is a syn. as per POWO.
Yes appears close to POWO specimens- onetwothree and four and as per image at FoPI.





References: POWO specimens- onetwothree and four  Catalogue of Life  The Plant List Ver.1.1  WCSP  IPNI  GBIF (High resolution specimens) Annotated checklist of Flowering plants of Nepal  Flora of peninsular India India Biodiversity Portal  HEAR  New Record of the Rubiaceous Plants for the Flora of Hong Kong