Impatiens leptoceras DC., Prodr. 1: 688. 1824; Hook. f., Fl. Brit. India 1: 477. 1875 & in Rec. Bot. Surv. India 4: 16. 1905. I. longicornu Wallich in Roxb., Fl. Ind. 2: 462. 1824.

Herbs; stems branched. Leaves linear-lanceolate, to ovate-elliptic, attenuate at base, acuminate at apex, finely serrate to crenate along margins, 7.5 - 12.5 x 2 - 4.5 cm, finely pubescent above and beneath; lateral nerves 6 - 12 pairs; petiole 2.5 - 7.5 cm long, glabrous. Flowers pedunculate, 2 - 3 cm; bracts deciduous. Lateral sepals ovate-lanceolate, acute, 2 - 3 mm long. Lip shallowly and obliquely navicular, 5 - 6 mm long, spurred; spur abruptly constricted, filiform, 1.5 - 2.2 cm. Standard suborbicular. Wings 1.2 - 1.4 cm long; basal lobes somewhat triangular; distal lobes elliptic-obovate, auricle long, obtuse.

Fl. & Fr. Sept. - Oct.

Distrib. India: E. Himalayas. Arunachal Pradesh, Manipur and Meghalaya.

China.