《中国植物志》|| 豆科 LEGUMINOSAE ||短硬毛棘豆系 Ser. Hirsutiusculae Vass. ||改则棘豆 Oxytropis gerzeensis P. C. Li

24. 改则棘豆（西藏植物志）
Oxytropis gerzeensis P. C. Li in Fl. Xizang. 2: 859. 1985.
茎高8-10厘米，平卧或斜升，疏被开展长柔毛。托叶草质，彼此于中部以下合生，与叶柄分离，疏被开展长柔毛；小叶13-19，长圆形或卵状长圆形，长4-7毫米。宽2.5-3毫米，两面密被开展的绢状长柔毛。6-8花组成伞形总状花序；总花梗稍短于叶或与叶近等长，下部疏被白色与黑色长柔毛，上部密被黑色长柔毛；花萼长约6毫米，密被黑色短柔毛，萼齿比萼筒短；花冠紫色，旗瓣长9-10毫米，瓣片宽卵形，翼瓣长8-9毫米，瓣片长圆形，先端不等的浅2裂，龙骨瓣比翼瓣短，瓣片微弯，具短喙；子房无毛。荚果未完全成熟，卵状椭圆形，长10-12毫米，宽5-6毫米，具短梗。
产西藏。生于海拔5200米的山坡草甸中。模式标本采自西藏改则。
本种与黄花棘豆 O. ochrocephala Bunge 和黑萼棘豆 O. melanocalyx Bunge 相似，但以小叶较少，花冠蓝色与前者有别；又以小叶较宽，两面密被白色开展的绢状长柔毛与后者有异。

《Flora of China》|| Fabaceae || Oxytropis ||改则棘豆 Oxytropis gerzeensis

31. Oxytropis gerzeensis P. C. Li, Fl. Xizang. 2: 859. 1985.

改则棘豆 gai ze ji dou

Herbs, 8-13 cm tall, caulescent, with 2 or more apparent internodes, horizontal or prostrate, with spreading sparse tri­chomes. Stipules herbaceous, with spreading trichomes, free from petiole, basal half connate. Leaves 1.5-4 cm, 12-17(-21)-foliolate; leaflet blades oblong, ovate-oblong, or lanceolate, 4-7 × 2.5-3 mm, both surfaces densely sericeous with long tri­chomes. Racemes dense, 6-8-flowered; peduncle 2.5-4 cm, slender, slightly shorter than to as long as leaves, basally with appressed white and black long trichomes, apically with dense black ones; bracts narrowly lanceolate, shorter than calyx. Ca­lyx 5.5-6 mm, with dense black short trichomes; lobes shorter than tube. Corolla purple; standard 8.5-10 mm, lamina broadly ovate, apex emarginate; wings 8-9 mm, lamina oblong, apex with 2 unequal lobes; keel shorter than wings, beak short. Leg­ume (immature) shortly stipitate; body ovoid to ellipsoid, 10-12 × 5-6 mm, tapering to a beak. Fl. and fr. Sep.

● Meadows; 3400-5200 m. Qinghai, Xinjiang, Xizang.