Adenosma indiana

Adenosma indiana (Lour.) Merr., Trans. Amer. Philos. Soc. n.s., 24(2): 351 1935. (Syn: Adenosma buchneroides Bonati; Adenosma capitata (Benth.) Benth. ex Hance; Adenosma capitata var. spicata Bonati; Manulea indiana Lour.; Manulea indica Willd.; Pterostigma capitatum (Benth.) Benth.; Pterostigma spicatum Benth.; Stemodia capitata Benth.; Stoechadomentha capitata (Benth.) Kuntze);
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Tropical & Subtropical Asia: Assam, Bangladesh, Borneo, Cambodia, China South-Central, China Southeast, East Himalaya, Hainan, India, Jawa, Laos, Malaya, Myanmar, Nepal, Philippines, Sri Lanka, Thailand, Vietnam, West Himalaya as per POWO;
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Erect herbs; stem up to 45 cm tall, densely villous. Leaves opposite or whorled, 2-3.5 x 1-2 cm, ovate to elliptic-ovate, base rounded, margin serrate, apex acute, hairy on both sides, lateral nerves 6-8 pairs, sessile. Flowers in dense, terminal bracteate cylindric heads, 1.5-3 cm long; bracts linear. Calyx-lobes 5, 3-4 mm long, lanceolate, ciliate, upper largest. Corolla bluish or violet; tube c. 5 mm long, cylindric, upper lip erect, 2-fid, lower spreading, 3-lobed. Stamens 4, didynamous; anther cells stipitate. Ovules many; style filiform below, dilated above; stigma 2-fid. Capsules 3-4 x 2-2.5 mm, ellipsoid. Seeds c. 0.5 mm long, ovoid-oblong, reticulate.
Flowering and fruiting: June-October
Grasslands, deciduous and semi-evergreen forests
(Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi as per India Biodiversity Portal)
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Plants from Assam Dec 2018 : 8 posts by 3 authors. Attachments (5)- 1 Mb each.

Attached images are plants from Assam. Please ID the species.
Date :15.12.2018
Location: Assam
Family : Acanthaceae/Lamiaceae (?)
Genus & species : ??
Habitat: Grows wild on open sunny places
Habit :  Herb
Flower : Blue

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Appears to be some Acanthaceae member. 

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Pl. check comparative images at 

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Could not find a match as per comparative images at Acanthaceae.

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Lamiaceae?

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It may be Neuracanthus sp. (Acanthaceae)

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Looks more like an Acanthaceae member to me. But an unfamiliar spp.

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Adenosma indiana (Lour.) Merr.

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References: POWO  Catalogue of Life  The Plant List Ver.1.1  IPNI  GBIF (High resolution specimens) Flora of China (Adenosma indianum (Loureiro) Merrill) Annotated checklist of Flowering plants of Nepal  Flora of peninsular India  India Biodiversity Portal  IBIS Flora (FBI) tracuuduoclieu  epharmacognosy  Roddure  Prodifact