Adenosma subrepens Benth. ex Hook.f., Fl. Brit. India 4: 263 1884. (syn: Pterostigma subrepens Thw.; Stoechadomentha subrepens (Thw.) Kuntze);
Sri Lanka as per POWO;

Low scandent herbs; stems villous, aromatic. Leaves opposite, to 4 x 2 cm, ovate, acute, crenate, cuneate at base, hispid above and below; nerves 6 pairs, prominent, nervules reticulate; petiole 7 mm long. Flowers axillary, solitary, subsessile; bracteoles absent; calyx 7 mm long, deeply lobed, lobes 5, upper larger, hirsute; corolla 10 mm long, blue, bilabiate, upper lip erect, entire, lower lip 3-lobed; stamens 4, didynamous, anthers stipitate, of shorter stamens 1-celled; ovary glabrous; style dialated at tip. Fruit a septicidal capsule; seeds many, pitted.

Flowering and fruiting: Throughout the year
Semi-evergreen forests
South India and Sri Lanka
(Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi as per India Biodiversity Portal)

17 Identify the weed plant : 5 images.
Please identify the weed plant.
Location:  near Reserve Forest, Chathamattom, Ernakulam District, Kerala PIN:686671
Date:.               05.11.2020, 12.30pm
Altitude:           1700fsl
Habitat:            wild moisture marshy near paddy field
Plant habit:      creeping annual
Height:             01 feet
Leaves shape: apex, side jaws
Flower:             diameter:05mm, whitish blue non fragrant

LIndernia sp. ??

Thanks, …, for the suggestion.

But I do not think it is Lindernia as per comparative images herein.

My student Dr. Prasad MG identified this as Adenosma subrepens (Thwaites) Benth.ex Hook.f. of PLANTAGINACEAE

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