《中国植物志》|| 凤仙花科 BALSAMINACEAE ||凤仙花属 Impatiens L. ||双角凤仙花 Impatiens bicornuta Wall.

66. 双角凤仙花（西藏植物志）图版24: 1-8
Impatiens bicornuta Wall. in Roxb. Fl. Ind. ed. Carey 2: 460. 1824; Hook. f. Fl. Brit. Ind. 1: 475. 1875, et in Rec. Bot. Surv. Ind. 4 (2): 18 et 22. 1905; Hiroshi in Hara, Fl. E. Himal 195. 1960. 2: 75. 1971. 3: 78. 1975; 西藏植物志 3: 176. fig. 72. 1986.
一年生高大草本，高达1米。茎粗壮，肉质，无毛，有分枝。叶膜质互生，上部密集，具柄，椭圆形或椭圆状披针形，长7-15 (20) 厘米，宽4-6.5厘米，顶端尾状渐尖，基部楔形，边缘有粗圆齿，基部有小刚毛，侧脉10-12对，两面无毛或下面被疏短毛，叶柄长2-7厘米，基部具球状腺体。总花梗直立，密集于茎上部叶腋，长达25厘米，花多数，排成中断的总状花序；花梗束生或轮生，纤细，长1.5-2.5厘米，基部有卵形的苞片，苞片顶端有显明长芒状腺体。花淡蓝紫色，长1.5-2.5厘米；侧生萼片2，小，斜卵形，顶端具芒状腺体；旗瓣近圆形，顶端具小尖头；翼瓣无柄，基部裂片近圆形，顶端圆钝，上部裂片狭成尾状，稍尖，背面有反折的小耳；唇瓣、宽锥状或弯囊状，口部具角，基部急收缩成钩状或内弯的短距，具紫色斑点，花药钝。蒴果圆柱形，顶端喙尖。种子8-9个，近圆柱状，有光泽。花期6-8月。
产西藏（聂拉木、亚东）。生于海拔2400-2800米的水边草地或阔叶林和铁杉林下。印度西北部、尼泊尔、锡金也有。
此种在花芽期、唇瓣顶端有伸长草质具腺的喙，状像角。苞片及萼片顶端有具腺的长芒尖极易识别。

《Flora of China》|| Balsaminaceae || Impatiens ||双角凤仙花 Impatiens bicornuta

71. Impatiens bicornuta Wallich in Roxburgh, Fl. Ind. 2: 460. 1824.

双角凤仙花 shuang jiao feng xian hua

Plants annual, to 1 m tall. Stem robust, succulent, glabrous, branched. Leaves alternate, crowded at upper part; petiole (0.5-)2-7 cm, with globose glands at base; leaf blade elliptic or elliptic-lanceolate, 7-15(-20) × 4-6.5 cm, membranous, both surfaces glabrous or sparsely pilose, setose at base, lateral veins 10-12 pairs, base cuneate, margin coarsely crenate, apex caudate-acuminate. Inflorescences crowded in leaf axils, racemose, many flowered; peduncles erect, to 25 cm. Pedicels fascicled or verticillate, 1.5-2.5 cm, slender, bracteate at base; bracts ovate, with conspicuous aristate glands at apex. Flowers pale blue-purple, 1.5-2.8 cm deep. Lateral sepals 2, obliquely ovate, small, 4-6 mm, with aristate glands at apex. Lower sepal purple spotted, broadly sigmoid-curved-saccate, 1.5-2 cm, 2-2.5 cm deep (excluding spur), abruptly constricted into a hooked or incurved spur; mouth cornute. Upper petal cucullate, suborbicular, 1-1.2 cm × 1.4-1.6 cm, apex mucronulate; lateral united petals not clawed, 3.2-4 cm, 2-lobed; basal lobes ovate to suborbicular, 1.1-1.3 × 0.7-0.9 cm, apex truncate to rounded; distal lobes narrowly caudate, 2-2.7 × 0.6-0.7 cm, apex long tailed, acute; auricle inflexed, small. Anthers obtuse. Capsule cylindric. Seeds 8 or 9, subcylindric, shiny. Fl. Jun-Aug. 2n = 18.

Understories of Tsuga forests, grasslands by water; 2400-2800 m. S Xizang [N India, Nepal].