(a textual research on the names and facts of plants)
[source] it is the bark or root bark of Ulmus pumila.
[plant morphology] Langyu, also known as: zuomu (Zuozhuan), songxinmu (Shuowen), Langyu (materia medica), Langyu (compendium), xiaoyeyu, gousiyu, qiushu, zhangpiyu, tianliuyu.
Deciduous trees, up to 25 meters high, diameter at breast height up to 70 cm. The bark is grayish brown, falling off in irregular scales. Old branches gray, branchlets reddish brown, pubescent. Single leaf alternate, elliptic, elliptic, obovate to ovoid or obovate, 1.5-5.5 cm long, 1-2.8 cm wide, base round, slightly crooked, apex short pointed, leaf margin simple serrate, smooth or slightly rough above, dark green, hairy below when young, glabrescent, light green; leaves with short petiole; stipules narrow, early falling. Flowers clustered in axils of leaves; short stalked; perianth 4-lobed; stamens 4-lobed; anthers elliptic; pistil stigmas 2-lobed, revolute outward. The Samara is oval in shape with a concave top. Seeds in the center, about 1 cm long. The flowering period is July to September, and the fruiting period is October (Zhejiang).
It grows in plain, hilly land, mountainous area and sparse forest. It is distributed in Guangxi, Guangdong, Taiwan, Hunan, Jiangxi, Fujian, Anhui, Zhejiang, Jiangsu, Shandong, Sichuan, etc.
The stems and leaves of this plant (Ulmus pumila L.) are also used for medicine.
[collection] harvested in autumn, dried or fresh.
[chemical composition] the bark contains starch, mucilaginous substance, tannin, stigmasterol and other phytosterols; it contains 22.3% cellulose, 10.56% hemicellulose, 25.17% lignin, 8.0% pectin and 7.75% oil.
Wood contains 7-hydroxy-cardaneal, 3-methoxy-7-hydroxy-cardaneal, mammerone C, manzonone g and sitosterol.
[nature and taste] 1. Herbal notes: "sweet, cold, non-toxic. "
② Zhejiang folk commonly used herbs: "cold in nature, bitter in taste. "
[function indications] diuretic, Tonglin, Xiaoyong.
① "Materia medica collection": "it's hot under the Lord, it's good for water channel, it's sleepy. "
② "Compendium": "treating children and relieving cranium. "
[selection] 1. Treatment of breast carbuncle: two to three liang of white skin from the root of Longyu. Decoct in water and pound the affected area with dregs and sugar. (Zhejiang folk herbs)
② Treatment of wind and poison: one or two dried roots of elm. Take it in water. (Fujian Chinese herbal medicine)
According to Ben Jing Feng Yuan (treatise by famous experts), "Lang Yu is a kind of medicinal herb with sparse and beneficial nature. If you take it when your stomach is cold and empty, you are afraid to let out the true Qi. It is not appropriate to be good. "
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