Knoxia wightiana

Knoxia wightiana Wall. ex Wight & Arn., Gen. Hist. 3: 629 1834. (syn. Dentillaria wightiana (Wall. Ex G. Don) Kuntze);

India (Andhra Pradesh, Tamil Nadu) as per POWO;

Andhra Pradesh, Karnataka, Kerala and Tamilnadu as per Flora of Peninsular India;
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Glabrous woody herbs. Leaves to 6 x 1 cm, linear-lanceolate, curved, folded, glabrous, sessile; stipules ovate, 6 mm long, acute with few glandular teeth. Cymes 5-6 cm across, peduncled. Flowers 5 mm long, sessile; calyx 1.5 mm long, lobes obtuse; corolla-tube densely villous within; style 4 mm long. Capsule 2.5 x 2.5 mm; mericarps compressed, glabrous.

(Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi as per India Biodiversity Portal)

I think it may be Knoxia wightiana as per illustration and images in Flora of Peninsular India. However, I am not finding the key between the two.

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It’s wightiana …,  I too agree with you

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References:
POWO  Catalogue of Life  The Plant List Ver.1.1  WCSP  IPNI  Flora of Peninsular India GBIF (High resolution specimens)   India Biodiversity Portal  Kerala plants Wikimedia Commons
Flora of Eastern Ghats: hill ranges … – Google Books