山药藤，中药名。为薯蓣科薯蓣属植物山药DioscoreaoppositaThunb.的茎叶。植物山药，分布于华北、西北、华东和华中地区。具有清利湿热，凉血解毒之功效。主治湿疹，丹毒。
Shan-yao-teng, name of Chinese Medicinal Material. It refers to the stems and leaves of Dioscorea opposita Thunb., a plant of the family Dioscoreaceae. The plant Shan-yao is distributed in North China, Northwest China, East China, and Central China. It has the functions of clearing away damp-heat, cooling blood, and detoxifying. It is mainly used to treat eczema and erysipelas.

功效作用 功能
The efficacy and functions.

清利湿热，凉血解毒。主治
Clears damp-heat, cools the blood, and detoxifies. Used to treat [specific condition].

湿疹，丹毒。用法用量
Eczema, Erysipelas. Dosage and administration.

外用：适量，煎汤熏洗；或捣敷。相关论述
External use: Apply an appropriate amount, decoct and use for fumigation and washing, or apply as a poultice. Please refer to relevant literature for further discussion.

《上海常用中草药》：“治皮肤湿疹，丹毒。”临床应用 相关配伍
"Commonly Used Traditional Chinese Herbs in Shanghai": "Used for treating skin eczema and erysipelas." Clinical applications and relevant combinations.

治皮肤湿疹，丹毒，山药藤90-120g，煎汤熏洗。或鲜草捣烂外敷。（《上海常用中草药》）加工炮制 采收加工
To treat eczema and erysipelas, use 90-120g of Dioscorea nipponica, decoct it and use the liquid to fumigate and wash the affected area. Alternatively, apply mashed fresh grass externally. (From "Commonly Used Chinese Herbal Medicines in Shanghai") Processing and preparation: Harvest and process.

夏、秋季采收，洗净，切段晒干或鲜用。植物学信息 植物种属
Harvest in summer and autumn, wash, cut into sections and dry in the sun, or use fresh. Botanical information: Plant species.

薯蓣科薯蓣属植物山药。形态特征
Dioscoreaceae is a family of plants, and yam belongs to the genus Dioscorea. It has distinctive morphological characteristics.

山药，别名儿草《吴普本草》，延草《兼名苑》，白山药（西北、江苏、安徽），野牛尾苕（四川），理毛条（云南），长山药（山西），野薯（广东），菜山药（河南）。缠绕草质藤本。块茎长圆柱形，垂直生长，长可达1m，新鲜时断面白色，富粘性，干后白色粉质。茎通常带紫红色，右旋，无毛。单叶，在茎下部的互生，中部以上的对生，很少3叶轮生；叶片变异大，卵状三角形至宽卵状戟形，长3-9cm，宽2-7cm，先端渐尖，基部深心形、宽心形或戟形至近截形，边缘常3浅裂至3深裂，中裂片卵状椭圆形至披针形，侧裂片耳状，圆形、近方形至长圆形，两侧裂片与中间裂片相接处可连成不同的弧线，叶形的变异即使在同一植株上也常有出现。幼苗时一般叶片为宽卵形或卵圆形，基部深心形。叶腋内常有珠芽（零余子）。雌雄异株。雄花序为穗状花序，长2-8cm，近直立；2-8个着生于叶腋，偶而呈圆锥状排列；花序轴明显地呈“之”字形曲折；苞片和花被片有紫褐色斑点；雄花的外轮花瓣片宽卵形，内轮卵形；雄蕊6。雌花序为穗状花序，1-3个着生于叶腋。蒴果不反折，三棱状扁圆形或三棱状圆形，长1.2-2.0cm，宽1.5-3.0cm，外面有白粉。种子着生于每室中轴中部，四周有膜质翅。花期6-9月，果期7-11月。分布区域
Chinese yam, also known as Ercao "Wu Pu Ben Cao", Yancao "Jian Ming Yuan", Bai Shan Yao (Northwest, Jiangsu, Anhui), Wild Buffalo Tail Yam (Sichuan), Li Mao Tiao (Yunnan), Chang Shan Yao (Shanxi), Wild Potato (Guangdong), and Vegetable Chinese Yam (Henan). It is a twining herbaceous vine. The tuber is long cylindrical, vertically growing, and can reach up to 1m in length. When fresh, the cross-section is white and sticky, while it becomes powdery white after drying. The stem usually has a purplish-red color, is right-handed, and hairless. The leaves are usually alternate at the lower part of the stem, opposite in the middle and upper parts, and rarely whorled in threes; the leaf blades vary greatly, from ovate-triangular to broadly ovate-lanceolate, 3-9cm long and 2-7cm wide, gradually pointed at the apex, with a deep cordate, wide cordate, or lanceolate to nearly truncate base. The margins are often 3-lobed to 3-deeply lobed, with the middle lobes being ovate-elliptic to lanceolate, the lateral lobes being auriculate, round, nearly square, or oblong, and the junctions between the lateral lobes and the middle lobe forming different arcs. The variation in leaf shape can occur even within the same plant. In the seedling stage, the leaves are generally broadly ovate or oval, with a deep cordate base. There are often axillary buds (bulbils) in the leaf axils. It is dioecious, with male flowers in spicate inflorescences, 2-8cm long, nearly erect, with 2-8 flowers borne in the leaf axils, occasionally arranged in a conical shape. The inflorescence axis is distinctly zigzag-shaped, and the bracts and tepals have purple-brown spots. The outer tepals of the male flowers are broadly ovate, and the inner ones are ovate; there are 6 stamens. Female flowers are in spicate inflorescences, 1-3 borne in the leaf axils. The capsule is not reflexed, triangular-ovate or triangular-round, 1.2-2.0cm long and 1.5-3.0cm wide, with white powder on the outside. The seeds are borne in the middle of each locule, with membranous wings around the periphery. It flowers from June to September and fruits from July to November. Distribution area.

分布于华北、西北、华东和华中地区。生长环境
Distributed in North China, Northwest China, East China, and Central China regions. Growing environment

生于山坡、山谷林下、溪边、路旁的灌丛或杂草中；或为栽培。
Born on the hillside, in the valley under the forest, by the stream, or by the roadside in shrubs or weeds; or cultivated.