Impatiens trigonopteris Hook. f. in J. & Proc. Asiat. Soc. Bengal n. ser. 4: 189. 1908.

Herbs; stems slender, erect or sometimes decumbent at base, lowermost nodes rooting. Leaves ovate to ovate-lanceolate, long-attenuate into petiole, long-acuminate at apex, crenate along margins, 7.5 - 9.5 x 2 - 3.5 cm, green above, pale beneath, sparsely hairy above, glabrous beneath; lateral nerves 9 - 15 pairs; petiole 1 - 2.5 cm long. Flowers yellow; bracts lanceolate, 3 - 4 mm long; peduncles axillary, slender, 4 - 9 cm long; pedicels alternate on peduncle, slender, 1.1 - 1.8 cm long, glabrous. Lateral sepals ovate, ca 2.5 mm, with an appendage. Lip navicular, long-spurred. Standard cucullate, ca 3 mm long. Wings ca 9 mm long; basal lobes semiovate; distal lobes triangular, notched at apex. Capsules linear, acute, 1 - 1.5 cm long.

Fl. & Fr. Oct.

Distrib. India: E. Himalayas, 1820 - 2500 m. W. Bengal.

Endemic.