藏西黄耆查看源代码讨论查看历史
| 藏西黄耆 |
|
中文学名:藏西黄耆 拉丁学名:Astragalus webbianus Grah. ex Benth. 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:华黄耆亚属 组:短缩茎组 |
藏西黄耆（zàng xī huáng qí，学名：Astragalus webbianus Grah. ex Benth.）是豆科黄芪属的植物。分布在巴基斯坦、印度以及中国大陆的西藏等地，生长于海拔4,200米至4,600米的地区，一般生于河边砾石地。 [1]
藏西黄耆形态特征
半灌木，高15-20厘米。根粗壮，直伸。 茎短缩，基部木质化，被残存的叶柄和叶轴。
奇数羽状复叶，具31-51片小叶，长14-17厘米；叶柄与叶轴近等长，散生白色柔毛；托叶膜质，基部与叶柄贴生，披针形，长8-10毫米，下面散生白色长柔毛或近无毛；小叶卵形或长圆形，长4-10毫米，宽2-4毫米，先端钝或微凹，基部宽楔形或近圆形，上面无毛或近无毛，下面散生白色柔毛，具长约1毫米的短柄。
总状花序生2-4花，稍稀疏；总花梗腋生，长1-2厘米；苞片膜质，线形，长8-12毫米，下面散生白色或混有黑色长柔毛；花梗长4-5毫米，散生柔毛；花萼管状，长15-18毫米，散生白色柔毛或混有黑色柔毛，萼齿线状披针形，长4-5毫米；
花冠黄色，旗瓣长22-25毫米，宽约10毫米，先端微凹，基部渐狭，翼瓣较旗瓣短，长20-23毫米，瓣片长圆形，宽约3毫米，基部具短耳，瓣柄细，与瓣片近等长，龙骨瓣较翼瓣稍短，瓣片半卵形，较瓣柄稍短；子房狭卵形，无毛，近无柄。
荚果长圆形，长15-20毫米，无毛，近假2室；种子多数。[2] 花期6-7月。 [3]
Astragalus webbianus Grah. ex Benth. in Roy. III. Bot. Himal. 3: 199. 1835; Baker in Hook. f. Fl. Brit. Ind. 2: 132. 1876; Sven Hedin, S. Tibet 6 (3): 60. 1922; Ali in Nasir et Ali, Fl. W. Pakist. 100: 156. 1977; 西藏植物志2: 832. 图272 (1-9). 1985.
Astragalus minutofoliolatus Wendelbo.
Plants subshrubby, acaulescent to shortly caulescent, with white hairs 0.3-0.7(-1) mm, inflorescence also with black hairs. Stems, if present, up to 5 cm. Leaves 8-22 cm; stipules distinctly longitudinally nerved, 10-15 mm, adnate to petiole for 3-5 mm, lower ones ciliate and often hairy at base, upper hairy, often connate around petiole for 1-3 mm; petiole 3-6 cm, like rachis sparsely to loosely covered with ascending hairs up to 1 mm, toward end of vegetation period hardening and often spiny, persistent to next year or even longer; leaflets in 17-23 pairs, elliptic to obovate, 2-9 × 1-4.5 mm, abaxially and at margins sparsely ± appressed hairy, adaxially glabrous, apex rounded to slightly retuse. Racemes 2-5-flowered; peduncles several, 0.5-1.5 cm, appressed hairy; bracts 8-10 mm, with white and also black hairs. Bracteoles often present, up to 2 mm. Calyx 15-17 mm, sparsely to rather densely covered with ascending white and blackish to black hairs; teeth 4-8 mm. Pet-als yellow; standard obovate, 24-27 × 9-11 mm, apex emar-ginate; wings 22-23 mm; keel 19-21 mm. Legumes with a stipe 3-4 mm, 20-25 mm, 5-6 mm high and 8-10 mm wide, nar-rowly grooved ventrally and dorsally, with a straight beak 3-4 mm, 2-locular; valves glabrous.
Moraines, among debris in alpine zone; 3600-5000 m. Xizang [Afghanistan, India, Kashmir, Pakistan].
藏西黄耆生长环境
生长于海拔4200-4600米的河边砾石地。[4]