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光萼筒黄耆 |
中文学名:光萼筒黄耆 拉丁学名:Astragalus levitubus Tsai et Yu 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:黄耆亚属 组:膜荚组 |
光萼筒黄耆(学名:Astragalus levitubus Tsai et Yu in Bull.)是豆科黄芪属的植物,为中国的特有植物。分布在中国大陆的四川、云南等地,生长于海拔4,000米的地区,常生于山坡溪旁。 [1]
光萼筒黄耆形态特征
多年生草本。 茎直立,高20-30厘米,具条纹,散生白色或混有黑色柔毛。
羽状复叶有7-11片小叶,长6-9厘米;叶柄长3-5厘米;托叶叶状,离生,卵状椭圆形,长12-17毫米,宽5-8毫米,具白色缘毛;小叶长圆状卵形,长1.5-2.5厘米,宽1-1.3厘米,先端钝圆,基部宽楔形或近圆形,具短柄,幼时散生白色长柔毛,后近无毛或仅具缘毛。
总状花序有10余朵花,稍紧密,长2.5-3.5厘米;总花梗较叶稍长或近等长;苞片披针形,长6-8毫米,宽约2毫米,背面被黑色柔毛;花梗长约2毫米,同花序轴密生黑色柔毛;
花萼钟状,长6-7毫米,萼筒无毛,萼齿披针形,长2-3毫米,两面均被黑色柔毛,内面较密;花冠黄色,干时多少呈褐色,旗瓣倒卵形,长12-13毫米,先端微凹,基部渐狭;
翼瓣与旗瓣近等长,瓣片长圆形,基部具短耳,瓣柄长约8毫米;龙骨瓣与翼瓣近等长,瓣片半卵形,瓣柄比瓣片长近两倍;子房狭卵形,被白色或黑色柔毛。具柄。[2]
未见成熟荚果。[3]
Astragalus levitubus Tsai et Yu in Bull. Fan Mem. Inst. Biol. Bot. 9: 261. 1939.
Astragalus levitubus H. T. Tsai & T. T. Yu.
Plants 10-30 cm tall, with soft hairs 0.5-1 mm. Stems sev-eral, slender, up to 2 mm thick, sparsely covered with ascending white hairs. Leaves 2-7 cm; stipules 6-15 mm, ciliate; petiole short, like rachis slender, glabrous or sparsely hairy; leaflets in 3-6(-8) pairs, elliptic, 4-11 × 2-6 mm, abaxially sparsely ap-pressed white hairy at margin and especially at midvein, adax-ially glabrous. Racemes densely 6-12-flowered; rachis densely black hairy; peduncle 1.5-16 cm, sparsely white hairy, toward top increasingly spreading black hairy; bracts whitish to greenish, linear-acute, 3-6 mm, black ciliate. Calyx campan-ulate, 4.5-7 mm, not gibbous at base, with truncate mouth, tube glabrous; teeth 1.5-3 mm, black hairy. Petals yellow or purple, often dark purplish brown when dry, all of same length; stan-dard widely obtriangular to widely obovate, 11-12 × 6-8 mm. Legumes stipitate, narrowly ellipsoid, ca. 1.5 cm, very densely covered with appressed black hairs, acuminate at both ends.
Alpine meadows; 3500-4900 m. Qinghai, Sichuan, Xinjiang, Xi-zang, Yunnan [Bhutan, India, Nepal].
光萼筒黄耆生长环境
生长于海拔4000米以上的山坡溪旁。[4]