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,
Also does not matches with images at Neanotis
Can you tell what species of Oldenlandia are reported from your area to further check up?
Looks close to Oldenlandia pumila (L.f.) DC. !
References: POWO specimens- one, two, three 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