Introduction of Yu Mi Xu:Corn Stigma or Stigma Maydis.

TCM Herbalism:Medicinals and Classifications. ✵The article gives records of the herb Corn Stigma, its English name, Latin name, property and flavor, its botanical source one plant species, ①.Zea mays L., with a detailed introduction to the botanical features of this plant species, the growth characteristics, and ecological environment of this plant species, the features of the herb Corn Stigma, its pharmacological actions, medicinal efficacy, and administration guide.

Stigma Maydis(Corn Stigma).

Stigma Maydis:herb photo Pin Yin Name: Yù Mǐ Xū.
 English Name: Corn Stigma.
 Latin Name: Stigma Maydis.
 Property and flavor: neutral in nature, sweet, tasteless.

 Brief introduction: The herb Stigma Maydis is the dried styles and stigmata of Zea mays L., used (1).to induce diuresis for treating edema, (2).to promote bile discharge in cases of jaundice, and (3).to reduce high blood pressure in cases of hypertension. The herb is commonly known as Stigma Maydis, Corn Stigma, Yù Mǐ Xū.

 Botanical source: The herb Stigma Maydis(Corn Stigma) is the dried styles and stigmata of Zea mays L., it is a plant of the Zea Genus, the Poaceae family (Gramineae, grass family) of the Poales order. This commonly used species is introduced:

(1).Zea mays L.

 Zea mays L.:growing plant with stigma Botanical description: The Zea mays L., is a plant of the Poaceae family (Gramineae, grass family) and Zea genus, perennial herb, the plant grows up to 50~100 cm tall. Main root is hypertrophic, woody, often branched, off-white. Stems are upright, much branched at upper, with fine ribs, white pilose. Pinnate with 13~27 leaflets, 5~10 cm long; petiole is 0.5~1 cm; stipules are free, ovate, lanceolate or linear-lanceolate, 4~10 mm long, the lower part is white soft glabrous or glabrous; leaflets are elliptic or oblong-ovate, 7~30 mm long, 3~12 mm wide, apex is obtuse or slightly concave, with small pointed or inconspicuous, base is rounded, uppersurface is green, proximal glabrous, undersurface is white pilose. Racemes are slightly dense, with 10~20 flowers; total pedicels and leaves are nearly as long or long, to fruit significantly elongated; bracts are linear-lanceolate, 2~5 mm long, abaxially white pilose; Pedicels are 3~4 mm long, slightly brown or black pilose with inflorescences bracteate; 2 bracteoles; calyx campanulate, 5~7 mm long, outside is white or black pilose, sometimes calyx tube is subglabrous, calyx teeth is hairy, calyx teeth is short, triangular to subulate, longer than only 1/4~1/5 of calyx tube; corolla is yellow or yellowish, flag flap is obovate, 12~20 mm long, the base has a short handle, the flap is slightly shorter than the flap, the valve oblong, the base with short ears, valve handle is about 1.5 times longer than the flap, the keel flap and wing flap is nearly equal length, flap is semi-oval, pedicel is slightly longer than valves; ovary is shank, pilose. Pods are thinly membranous, slightly swollen, semi-elliptic, 20~30 mm long, 8~12 mm wide, spiny apical, both sides are white or black pubescent, fruit neck is beyond the calyx; 3~8 seeds. Its flowering period is from June to August, fruiting from July to September.

 Zea mays L.:corn cob growing on stem The Zea mays L., is cultivated widely nowadays, it was native to South America, and might first domesticated by indigenous peoples in southern Mexico about 10,000 years ago. It is now cultivated in many areas of the planet earth.

 Growth characteristics: The plant Zea mays prefers a high temperature, needs more water, loose and fertile soil is suitable for growth, it has been cultivated throughout China as a crop.

 Corn Stigma:herb photo Characters of herbs: The herb is often clustered into loose clusters, the styles are linear or fibrous, the intact style is as long as 30 mm, about 0.5 mm in diameter, light green, yellow-green to brown-red, shiny, slightly transparent, 2-lobed stigma, forked, up to 3 mm long, the texture of the herb is soft. The herb of better grade is soft and shiny.

 Pharmacological actions: ①.obvious diuretic effect, can inhibit protein excretion; ②.lowering blood pressure; ③.promote bile secretion and excretion, reduce bile viscosity and bilirubin content; ④.lower blood sugar, increases prothrombin in the blood and accelerates blood coagulation, etc.

 Medicinal efficacy: Prompt diuresis, prompt diuresis and detumescence (reduce swelling), eliminate heat, calm the liver, cholagogic effect. It is indicated for the treatment of nephritis, edema, dripping discharge of urine, beriberi, jaundice, hepatitis, hepatitis jaundice, hypertension, cholecystitis, gallstones, diabetes mellitus, hematemesis (vomit blood), epistaxis (nose bleeding or bleeding from five aperture or subcutaneous tissue), acute and chronic sinusitis, milk obstruction (alactation, no milk), acute mastitis, etc.

 Administration of Stigma Maydis (Yù Mǐ Xū): 
Reference: Administration Guide of Stigma Maydis (Yù Mǐ Xū)
TCM Books: ①.Internally:3~9 grams;②.Internally:water decoction,1~2 liang (about 30~60 grams),or charred the herb with its property retained, prepare to finely ground herb powder.Externally:burn smoke and inhale it; ③.Internally:water decoction, 15~30 grams, big dosage could be 60~90 grams,or charred the herb with its property retained,prepare to finely ground herb powder.Externally:burn smoke and inhale it.
 Precautions and Adverse Reactions:the silk should be peeled in cooking, should Not be used if not take as herbs.

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