狹葉黃耆
狹葉黃耆 |
中文學名:狹葉黃耆 拉丁學名:Astragalus angustifoliolatus K. T. Fu in Bull. 界:植物界 門:被子植物門 綱:雙子葉植物綱 亞 綱:原始花被亞綱 目:薔薇目 亞 目:薔薇亞目 科:豆科 亞 科:蝶形花亞科 族:山羊豆族黃耆亞族 屬:黃耆屬 亞 屬:簇毛亞屬 組:膨果組 系:雙小苞系 |
狹葉黃耆(xiá yè huáng qí,學名:Astragalus angustifoliolatus K. T. Fu in Bull.)為豆科黃芪屬的植物,為我國的特有植物。產雲南西北部(麗江)。生於海拔2750-3000米的碎石牧地或草坡。 [1]
目錄
狹葉黃耆形態特徵
根較粗壯,直徑4-5毫米,褐色。 莖多數,平臥,長30-50厘米,直徑1.5-2毫米,疏被或散生白色短伏毛,上部有時雜有暗褐色短伏毛。
羽狀複葉有15-27片小葉,長2-5厘米;葉柄長5-6毫米;托葉分離,三角狀鑽形,長約6毫米,先端漸尖,近無毛;小葉線形或狹長圓形,長5-12毫米,寬1-2.5毫米,先端鈍形,有小凸尖頭,基部楔形,上面無毛,下面被較密的白色伏毛,小葉柄長不及1毫米。
短總狀花序呈傘形花序式,生3-9花;總花梗長3-5厘米,同花序軸疏被暗褐色短伏毛,較葉長;苞片線形或線狀披針形,長5-6毫米,寬1-1.5毫米,先端漸尖,疏被暗褐色短毛;
花梗長1.5-2毫米,被暗褐色短毛;小苞片鑽形,長約2毫米,有短毛;花萼鍾狀,長6-7毫米,被較密暗褐色伏毛,萼筒長約3毫米,萼齒鑽形,長5-6毫米。
花冠淡黃色,龍骨瓣頂端紫紅色;旗瓣長14-15毫米,瓣片近圓形或寬倒卵形,長10-11.5毫米,寬10-11毫米,先端微缺,基部突然收狹,瓣柄長3.5-4毫米,翼瓣長12-13毫米,瓣片倒卵狀長圓形,長9-10毫米,寬3.5-4毫米,瓣柄長3-3.5毫米;
龍骨瓣長13-13.5毫米,瓣片近倒卵形,長10-11毫米,寬4-4.5毫米,瓣柄長3-3.5毫米;子房有柄,無毛,柄長2.5-3毫米,柱頭被簇毛。
莢果不詳。 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].
狹葉黃耆生長環境
生長於海拔2750-3000米的碎石牧地或草坡。