《中国植物志》|| 豆科 LEGUMINOSAE ||黄花木属 Piptanthus D. Don ex Sweet ||尼泊尔黄花木 Piptanthus nepalensis (Hook.) D. Don

1. 尼泊尔黄花木 金链叶黄花木（中国高等植物图鉴）
Piptanthus nepalensis (Hook.) D. Don in Sweet, Brit. Flow. Gard. 3: t. 264. 1828; Baker in Hook. f. Fl. Brit. Ind. 2: 62. 1876; Ohashi in Hara et al. Fl. E. Himal. 2: 67. 1971; Turner in Brittonia 32 (3): 282. 1980, pro parte; 西藏植物志2: 720. 1985. pro parte.——Baptisia nepalensis Hook. Exotic. Flor. 2: 131. 1824.——Thermopsis laburnifolia D. Don, Prod. Fl. Nepal. 239. 1825.——P. laburnifolius (D. Don) Stapf in Curtis Bot. Mag. 154: sub tab. 9234. 1931; 中国高等植物图鉴2: 364. 1972.
灌木，高1.5-3米。茎圆柱形，具沟棱，被白色棉毛。叶柄长1-3厘米，上面具阔槽，下面圆凸，密被毛；托叶长7-14毫米，被毛；小叶披针形、长圆状椭圆形或线状卵形，长6-14厘米，宽1.5-4厘米，先端渐尖，基部楔形，硬纸质，上面无毛，暗绿色，下面初被黄色丝状毛和白色贴伏柔毛，后渐脱落，呈粉白色，两面平坦，侧脉不隆起；总状花序顶生，长5-8厘米，具花2-4轮，花后几不伸长，密被白色棉毛，不脱落；苞片阔卵形，长约1.2厘米，先端锐尖，密被毛；花梗长2-2.5厘米；花长约3厘米；萼钟形，长1.2-1.6厘米，被白色棉毛，萼齿5，上方2齿合生，三角形，长4毫米，下方3齿披针形，与萼筒近等长；花冠黄色，旗瓣阔心形，瓣片长约2.5厘米，宽2厘米，先端凹，瓣柄长约6毫米，翼瓣稍短，长约2.3厘米，宽8毫米，先端钝圆，龙骨瓣长约3厘米，宽9-10毫米；子房线形，具短柄，密被黄色绢毛，胚珠2-10粒。荚果阔线形，扁平，长8-15厘米，宽1.6-1.8厘米，先端骤尖，具尖喙，基部具颈，颈长1.6厘米，被毛，果瓣膜质，网状脉纹明显，疏被柔毛；有4-8粒种子。种子肾形，压扁，黄褐色，长4-5毫米，宽3-3.5毫米。花期4-6月，果期6-7月。
产西藏。生于山坡针叶林缘、草地灌丛或河流旁，海拔3000米左右。尼泊尔、不丹、克什米尔也有分布。

《Flora of China》|| Fabaceae || Piptanthus ||黄花木 Piptanthus nepalensis

1. Piptanthus nepalensis (Hooker) Sweet, Brit. Fl. Gard. 3: t. 264. 1828.

黄花木 huang hua mu

Baptisia nepalensis Hooker, Exot. Fl. 2: 131. 1824; Pip­tanthus bicolor Craib; P. bombycinus C. Marquand; P. concolor Harrow ex Craib; P. concolor subsp. harrowii Stapf; P. concolor subsp. yunnanensis Stapf; P. forrestii Craib; P. laburnifolius (D. Don) Stapf; P. laburnifolius f. nepalensis Stapf; P. laburnifolius f. sikkimensis Stapf; P. leiocarpus Stapf; P. leiocarpus var. sericopetalus P. C. Li; P. nepalensis f. leiocarpus (Stapf) S. Q. Wei; P. nepalensis var. leiocarpus (Stapf) X. Y. Zhu; P. nepalen­sis f. sericopetalus (P. C. Li) S. Q. Wei; P. nepalensis var. seri­copetalus (P. C. Li) X. Y. Zhu; Thermopsis laburnifolia D. Don.

Shrubs, 1.5-3 m tall. Stems terete, ridged, white woolly to appressed pubescent, glabrescent. Stipules lanceolate to ovate, 7-14 mm; petiole 1-3 cm, with a wide groove adaxially; leaf­lets elliptic, oblong-elliptic, or linear-ovate, 4-14 × 1.5-4 cm, flat on both surfaces, papery, dark green, yellow silky and white appressed pubescent abaxially, gradually glabrescent, becoming glaucous, glabrous or sparsely hairy along midrib adaxially, lat­eral veins 6-8 pairs, base cuneate, margins sometimes ciliate, apex acute or acuminate. Racemes terminal, 5-8 cm, with flow­ers in 2-7 whorls, axis densely white woolly, elongating at an­thesis; bracts broadly ovate to obovate, 7-12 mm, acute; pedi­cels 1.5-2.5 cm. Calyx campanulate, 1-1.6 cm, white woolly. Corolla bright yellow, 1.8-2.6 cm; standard orbicular to broadly cordate, with 4-6 mm claw; wings shorter; keel equal to or slightly longer than standard, to 2.2 cm. Ovary stipitate, densely sericeous to almost glabrous, 4-10-ovuled. Legume broadly linear, flat, 7-15 × 0.9-1.5 cm, stipitate, apex sharply pointed; valves membranous, reticulate, glabrous to very sparsely pubes­cent. Seed brown, reniform, 4-5 × 3-3.5 mm, compressed. Fl. Apr-Jul, fr. Jun-Sep.

Coniferous forests, woodland margins, thickets, meadows; 1600-4000 m. Gansu, Shaanxi, Sichuan, Xizang, Yunnan [Bhutan, India, Kashmir, Nepal].

This is a very variable species, and several taxa have been dis­tinguished on the basis of variation in the indumentum of the ovary, legume, and leaves. Turner (Brittonia 32: 281-285. 1980) revised the genus and concluded that variation in these characters was continuous and that only two taxa should be recognized, and we agree. Even Piptanthus tomentosus could be considered to be a very hairy higher-elevation ecotype, but it is here retained as distinct.