Thesium unicaule Haines in J. Asiat. Soc. Bengal, 1919, n. s. 15: 316, t. 10. 1919 (publ. 1920) & Bot. Bihar Orissa 5: 804. 1924.

Herbs, erect, weak, non-parasitic, up to 35 cm high, green; stems solitary, very slender, with fastigiated branches, glabrous. Leaves numerous, alternate, linear or acicular, the lower 2.5 – 3.5 cm long, the upper smaller and bearing flowers in their axils. Flowers: bisexual, sessile in the axils of bracts, ca 3 mm long; bracts similar to leaves; bracteoles 2, sessile, linear, ca 2 mm long; perianth-lobes 4, fleshy, oblong, ca 3 mm long, white-margined, slightly villous inside and with some hairs behind the anthers; stamens equal to and opposite to the perianth-lobes; ovary inside the hypanthium cup; ovules 1 – 3, minute. Fruits globose to ellipsoid, with two linear bracts adnate to base of leaf below the fruit, becoming bottle-shaped.

Fl. & Fr. April – June.

Distrib. India: Amidst grasses. Bihar (Chota Nagpur hills).

Endemic.