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兔尾黄耆

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中文学名:兔尾黄耆 界:植物界 属:黄耆属 分布区域:草原及山坡草地 高:5-11厘米

兔尾黄耆(tù wěi huáng qí，学名 Astragalus laguroides Pall.，异名：Astragalus gobialtaicus Astragalus lagurus Astragalus lupulinus var. laguroides )，多年生草本，高5-11厘米。茎极短缩，不明显。产内蒙古中部。生于草原及山坡草地。模式标本采自巴干毛塔苏木。

兔尾黄耆形态特征

　兔尾黄耆兔尾黄耆，多年生草本，高5-11厘米。茎极短缩，不明显。羽状复叶有5-13片小叶，长5-9厘米；叶柄与叶轴近等长，被白色伏贴的粗毛；托叶卵状披针形，长4-5毫米，被白色半开展的粗毛；小叶椭圆形、倒卵形或披针形，长8-13米。

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总状花序卵状长圆形，生多数花，排列紧密；总花梗与叶等长、稍长或稍短，被白色半伏贴毛；苞片线形，长2-3毫米，疏被白色长毛；花萼初期管状，后稍膨大成长卵形，长9-10毫米，被白色开展的长毛，萼齿钻形，长2-3毫米；

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花冠淡紫色，旗瓣长14-16毫米，瓣片狭长圆形，先端钝圆稀微凹，下部渐狭成瓣柄，翼瓣较旗瓣稍短，瓣片狭长圆形，先端全缘，长约为瓣柄的1/2，龙骨瓣较翼瓣短，长10-12毫米，瓣片较瓣柄短；子房近无柄，被白色绵毛。

荚果卵圆形，长7-8毫米，被白色开展毛，1室。

花期5-6月，果期6-7月。本变种与原变种不同处在于：花较小，旗瓣长不超过16毫米；花萼上无开展的黑毛；小叶不超过7对。

Astragalus laguroides Pall. Reise, Russ. Reich. 3: 750. 1776; DC. Prodr. 2: 300. 1825; Ledeb. Fl. Ross. 1: 646. 1842; Bunge in Mem. Acad. Sci. St. Petersb. VII. 15 (1): 236. 1869; Boriss. in Kom. Fl. USSR 12: 855. 1946.

Astragalus gobi-altaicus N. Ulziykhutag; A. lagurus Pal-las; A. lupulinus Pallas var. laguroides (Pallas) Basilevskaja.

Plants 5-16(-20) cm tall, acaulescent or nearly so, vege-tative parts covered with medifixed, appressed, white hairs 0.8-1.1 mm. Stems, if present, up to 1.5 cm, densely hairy. Leaves 3-14 cm; stipules 6-7(-10) mm, adnate to petiole for 2(-3) mm, hairy; petiole 1.5-5 cm, like rachis densely to rather densely hairy; leaflets in 3-5(-8) pairs, in basal leaves often only in 1 or 2 pairs, 8-25 × 3-8 mm, both surfaces rather densely hairy, apex acute. Racemes ovoid, 2-6 cm, densely many flowered; peduncle 2-11 cm, rather densely covered with symmetrically or asymmetrically bifurcate, appressed to subap-pressed, white hairs 0.4-1 mm, toward raceme sometimes also with some black hairs mixed in; bracts 5-10 mm, covered with asymmetrically bifurcate, at margins with basifixed, white hairs. Calyx at anthesis tubular, soon becoming inflated ovoid, 11-14 mm, loosely to rather densely covered with asymmetrically bi-furcate to basifixed, tangled, spreading, white hairs 1-2 mm, with some black hairs mixed in; teeth 3-6 mm. Petals violet; standard narrowly obovate, 17-20 × 6-7 mm, mostly slightly constricted in middle, apex emarginate; wings 14-17 mm; keel 13-15 mm. Legumes included in calyx, sessile, oblong, 7-8 mm, with a hooked beak ca. 1 mm, 1-locular; valves covered with spreading white hairs.

Xinjiang [Mongolia, Russia (Siberia)].

兔尾黄耆生长环境

生长于草原及山坡草地。

兔尾黄耆分布范围

分布于内蒙古中部。模式标本采自巴干毛塔苏木。