Salix simonii
1、         This product is the dry and delicate branches and leaves of Tamarix chinensis lour., a Tamarix family plant. Harvest before the flowers bloom in summer and dry in the shade.
        [properties] the stems and branches of this product are thin cylindrical, with a diameter of 0.5 ~ 1.5mm. The surface is gray green; There are many alternate scalelike leaflets. . The surface of the slightly thick branches is reddish brown, the leaves often fall off and the residual protuberant leaf base, the section is yellowish white, and the center is myelinated. The air is weak and the taste is light.
        [identification] (1) the powder of this product is grayish green. . Adventitious stomatal depression. Calcium sulfate crystals are numerous, most of which are clustered, and some have obvious edges and corners. The fibers are mostly in bundles, with slightly thick walls, lignified, smooth surfaces or spiny protrusions; Some surrounding cells contain calcium sulfate crystals to form crystal fibers. Threaded conduits and conduits with rimmed pits are visible.
        (2) Take 2G of this product powder, add 25ml of methanol, sonicate for 20 minutes, filter, and take the filtrate as the test solution. Another 2G of Salix simonii reference medicinal material was taken, and the reference medicinal material solution was prepared by the same method. Test according to thin-layer chromatography (general rule 0502), suck 3 µ l of each of the above two solutions, dot them on the same polyamide film, use ethanol acetone formic acid water (10:6:0.5:5) as the developing agent, develop, take out, air dry, spray 3% aluminum trichloride ethanol solution, and inspect under ultraviolet light (365nm). In the chromatogram of the test sample, fluorescent spots of the same color appear at the position corresponding to the chromatogram of the control medicinal material.
        [check] moisture   Not more than 15.0% (the second method of general rule 0832).
        Total ash   Not more than 15.0% (general rule 2302).
        [extract] according to the hot leaching method under the determination method of water-soluble extract (general rule 2201), it shall not be less than 25.0%.
        Decoction pieces
        [processing] remove old branches and impurities, wash, moisten slightly, cut into sections, and dry.
        This product is a cylindrical segment. The surface is grayish green or reddish brown, the leaves often fall off and the leaf base section with residual protrusions is yellowish white, and the center is myelinated. The air is weak and the taste is light.
        [identification], [inspection], [extract] are the same as that of medicinal materials.
        [nature, taste and meridian tropism] sweet, pungent and smooth. .
        [functions and indications] it can penetrate rash, dispel wind and remove dampness. For measles impervious, rheumatism arthralgia.
        .
        [storage] put it in a dry place.


2、 Chemical constituents of Salix simonii
Tamarixol, tamarixone, tamarixol were isolated from the tender branches and leaves of dried Tamarix chinensis,β - sitosterol（β-sitosterol），Carotene（darcosterol）， Quercetin dimethyl ether (qrer-cetin-3,4-dimethyl ether), stearic acid (stearic acid), n-xxxiane (hentriacontane), 12-hentriacontanol (12 hentriacontanol), dotriacontanol acetate. Kaempferol-4-methyl ether, kaempferol-7,4-dimethyl ether,quercetin （quercetin）， Quercetin-3-methyl, i.eIsorhamnetin（isorhamnetin），gallic acid（gallicacid）， Methyl gallate-3-methyl ether and trans-2-hydroxy-4-methoxycinnamic acid.

3、 Pharmacological effects of Salix xiheensis l.var.xiheensis l.var.xiheensis l.var.xiheensis l.var.xiheensis l.var.xiheensis l.var.xihehe
. For measles impervious, rheumatism arthralgia.