《中国植物志》|| 豆科 LEGUMINOSAE ||扁荚组 Sect. Obscura B. Fedtsch. ||多序岩黄耆 Hedysarum polybotrys Hand.-Mazz.

10. 多序岩黄耆（中国主要植物图说•豆科）
Hedysarum polybotrys Hand. -Mazz. Symb. Sin. 3: 563. 1933; 中国主要植物图说•豆科452. 图444. 1955; 秦岭植物志1 (3): 71. 1981.
多年生草本，高100-120厘米。根为直根系，粗状，深长，粗约1-2厘米，外皮暗红褐色。茎直立，丛生，多分枝；枝条坚硬、无毛，稍曲折。叶长5-9厘米；托叶披针形，棕褐色干膜质，合生至上部；通常无明显叶柄；小叶11-19，具长约1毫米的短柄；小叶片卵状披针形或卵状长圆形，长18-24毫米，宽4-6毫米，先端圆形或钝圆，通常具尖头，基部楔形，上面无毛，下面被贴伏柔毛。总状花序腋生，高度一般不超出叶；花多数，长12-14毫米，具3-4毫米长的丝状花梗；苞片钻状披针形，等于或稍短于花梗，被柔毛，常早落；花萼斜宽钟状，长4-5毫米，被短柔毛，萼齿三角状钻形，齿间呈宽的微凹，上萼齿长约1毫米，下萼齿长为上萼齿的1倍；花冠淡黄色，长11-12毫米，旗瓣倒长卵形，先端圆形、微凹，翼瓣线形，等于或稍长于旗瓣，龙骨瓣长于旗瓣2-3毫米；子房线形，被短柔毛。荚果2-4节，被短柔毛，节荚近圆形或宽卵形，宽3-5毫米，两侧微凹，具明显网纹和狭翅。花期7-8月，果期8-9月。
产甘肃六盘山和南部的山地，四川西北部等。生于山地石质山坡和灌丛、林缘等。模式标本采自甘肃临洮。
根为著名中药材，名日“红芪”，作黄芪入药并远销东南亚各地。

《Flora of China》|| Fabaceae || Hedysarum ||多序岩黄耆 Hedysarum polybotrys

8. Hedysarum polybotrys Handel-Mazzetti, Symb. Sin. 7: 563. 1933.

多序岩黄耆 duo xu yan huang qi

Herbs, perennial, 7-12 cm tall. Stems caespitose, erect. Stipules lanceolate, 5-7 mm, connate less than to middle. Leaves 5-9 cm, 11-19-foliolate; leaflet blades ovate, ovate-lan­ceolate, or ovate-oblong, 1.5-3 × 0.4-1.5 cm, abaxially with ap­pressed trichomes, adaxially glabrous. Racemes dense, with many flowers; bracts subulate-lanceolate, marcescent, 1/4-2/3 as long as pedicels; peduncle ± as long as to longer than leaves. Pedicel 3-4 mm. Calyx obliquely campanulate, 4-5 mm, pu­bescent; teeth triangular-subulate, unequal, most abaxial tooth ca. 2 mm and ca. 2 × as long as others. Corolla yellow; standard long obovate, 1.1-1.2 cm; wings as long as to slightly longer than standard; keel 2-3 mm longer than standard. Ovary pu­bescent. Legume divided into 2-4 articles; articles subglobose to broadly ovoid, (3-)4-5(-6) mm in diam., compressed, pubescent, margin narrow and entire. Fl. Jul-Aug, fr. Aug-Sep.

● Gravelly and stony slopes, forest margins; 1200-3200 m. E and S Gansu, W Hebei, S Nei Mongol, Ningxia, N Shanxi, NW Sichuan.

The roots are used medicinally.