Botanical Survey of India | Flora of India

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Impatiens bicornuta Wallich in Roxb., Fl. Ind. 2: 460. 1824; Hook. f. & Thomson in J. Linn. Soc., Bot. 4: 147. 1860; Hook. f., Fl. Brit. India 1: 475. 1875 & in Rec. Bot. Surv. India 4: 8. 1904; Biswas, Pl. Darj. Sikkim Himal. 1: 204. 1966; H. Hara in Fl. E. Himal. 1: 195. 1966, 2: 75. 1971 & 3: 78. 1975. I. pradhanii H. Hara in J. Jap. Bot. 40: 99. 1965 & in Fl. E. Himal. 1: 196. 1966; Akiyama in J. Jap. Bot. 62(12): 368. 1987.


Herbs, annual, tall; stems stout, succulent, broadly winged or not. Leaves alternate, elliptic to lanceolate, oblong, abruptly cuneate to gradually attenuate at base, long-acuminate at apex, crenate along margins, crenations 3 - 7 mm apart, ca 1 mm long filiform appendages present between crenations, 4.5 - 23 x 1.8 - 8 cm, at times purple below, pubescent on both sides; lateral nerves 5 - 14 pairs; petiole slender, 2.5 - 7.5 cm long, glabrous; stipular glands present. Flowers in subterminal racemes, 2 - 3 cm long, rose to pink or yellow with red or purplish or brown spots on petals; bracts lanceolate, ca 3 mm long with a glandular appendage at apex; peduncles stout, erect, 4.5 - 17 cm long; pedicels slender, whorled, 1.8 - 2.5 cm long. Lateral sepals ovate, 2 - 5 x 1.5 - 2 mm, awned; awn with a curved, gland-tipped, 1 - 2 mm long appendage. Lip bucciniform, 1.5 - 2.5 cm long; spur abruptly constricted, incurved, short, 2 - 5 mm long; mouth with a long projecting appendage. Standard cucullate, 6 - 8 mm long. Wings with emarginations on both sides of sinus of basal and distal lobes; lobes small, basal lobes ovate; distal lobes more or less ovoid with long appendages. Capsules oblong, acute, ca 3.5 cm long.

Fl. & Fr. July - Oct.

Distrib. India: Temperate forests of W. & E. Himalayas. 2700 - 3000 m. Himachal Pradesh, Uttar Pradesh (Garhwal), W. Bengal, Sikkim and Arunachal Pradesh.

Nepal.

Notes. The small flowered variety var. micrantha H. Hara (Fl. E. Rimal. 3: 78. 1975) discovered from Nepal has not been reported so far from contiguous areas, but may well occur.

Hara (l.c. 1965) described a new species I. pradhanii based on his collections from Sikkim. Detailed studies of Akiyama (l.c.) based on additional collections from Nepal reveal that the characters used for separating these species namely winged stem and longer appendage at the mouth of lip are highly variable and unreliable. The only clear-cut difference he could notice was the flower colour-yellow with reddish purple or brown dots in I. pradhanii and pale red purple with dark red purple dots in the other species. Flower colour alone cannot be taken as a suitable character to recognize a species.

Chromosome no. 2n = 16 (Virendra Kumar & Subramaniam. Chr. Atlas Fl. Pl. Ind. Subc. 1: 84. 1986).




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