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狭叶黄耆 |
中文学名:狭叶黄耆 拉丁学名:Astragalus angustifoliolatus K. T. Fu in Bull. 界:植物界 门:被子植物门 纲:双子叶植物纲 亚 纲:原始花被亚纲 目:蔷薇目 亚 目:蔷薇亚目 科:豆科 亚 科:蝶形花亚科 族:山羊豆族黄耆亚族 属:黄耆属 亚 属:簇毛亚属 组:膨果组 系:双小苞系 |
狭叶黄耆(xiá yè huáng qí,学名:Astragalus angustifoliolatus K. T. Fu in Bull.)为豆科黄芪属的植物,为我国的特有植物。产云南西北部(丽江)。生于海拔2750-3000米的碎石牧地或草坡。 [1]
狭叶黄耆形态特征
根较粗壮,直径4-5毫米,褐色。 茎多数,平卧,长30-50厘米,直径1.5-2毫米,疏被或散生白色短伏毛,上部有时杂有暗褐色短伏毛。
羽状复叶有15-27片小叶,长2-5厘米;叶柄长5-6毫米;托叶分离,三角状钻形,长约6毫米,先端渐尖,近无毛;小叶线形或狭长圆形,长5-12毫米,宽1-2.5毫米,先端钝形,有小凸尖头,基部楔形,上面无毛,下面被较密的白色伏毛,小叶柄长不及1毫米。
短总状花序呈伞形花序式,生3-9花;总花梗长3-5厘米,同花序轴疏被暗褐色短伏毛,较叶长;苞片线形或线状披针形,长5-6毫米,宽1-1.5毫米,先端渐尖,疏被暗褐色短毛;
花梗长1.5-2毫米,被暗褐色短毛;小苞片钻形,长约2毫米,有短毛;花萼钟状,长6-7毫米,被较密暗褐色伏毛,萼筒长约3毫米,萼齿钻形,长5-6毫米。
花冠淡黄色,龙骨瓣顶端紫红色;旗瓣长14-15毫米,瓣片近圆形或宽倒卵形,长10-11.5毫米,宽10-11毫米,先端微缺,基部突然收狭,瓣柄长3.5-4毫米,翼瓣长12-13毫米,瓣片倒卵状长圆形,长9-10毫米,宽3.5-4毫米,瓣柄长3-3.5毫米;
龙骨瓣长13-13.5毫米,瓣片近倒卵形,长10-11毫米,宽4-4.5毫米,瓣柄长3-3.5毫米;子房有柄,无毛,柄长2.5-3毫米,柱头被簇毛。
荚果不详。 花期7-8月。 [2]
Astragalus angustifoliolatus K. T. Fu in Bull. Bot. Res. 2 (1): 123. f. 4. 1982.
Plants subshrubby, (10-)15-35(-45) cm tall, subacau-lescent to shortly caulescent. Stems ligneous in lower parts, parts of current year 1-3(-5) cm, very densely covered with medifixed, appressed, white hairs 0.2-0.3 mm. Leaves (3-)5-12(-14) cm; stipules 5-12 mm, glabrous; petiole 2-3(-5) cm, like rachis loosely to rather densely white hairy; leaflets 5-11(-14) pairs, narrowly linear, (13-)20-30 × 1-2(-3) mm, abaxially densely and adaxially sparsely to loosely covered with medifixed, appressed hairs 0.8-1 mm, apex acute. Ra-cemes 3-4 cm, 12-20-flowered, elongating in fruit up to 6-14 cm; peduncle (5-)10-18 cm, hairy; bracts 4-10 mm, white and black hairy. Calyx 10-15 mm, tubular, densely covered with subbasifixed, ± spreading, white hairs 1-1.5 mm and especially at dorsal side with mostly shorter and more appressed black hairs; teeth 2-4 mm. Petals ?yellow; standard narrowly elliptic, 22-25 × 6-7.5 mm, apex slightly retuse; wings 17-18 mm; keel 14-15 mm. Legumes sessile, erect, ellipsoid, 8-12 mm, 3-4 mm high and 4-5 mm wide, with a slightly curved beak 3-4 mm, incompletely 2-locular; valves densely covered with strongly asymmetrically bifurcate, appressed, white hairs 0.8-1 mm, in upper part with mostly shorter black hairs mixed in.
NW Xinjiang [Kazakhstan, Kyrgyzstan].
狭叶黄耆生长环境
生长于海拔2750-3000米的碎石牧地或草坡。