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

TCM Herbalism:Medicinals and Classifications. ✵The TCM herbalism is also known as pharmaceutics of Traditional Chinese Medicine, or Chinese pharmaceutics, is the branch of health science dealing with the preparation, dispensing, and proper utilization of Chinese herbs. It is majorly composed of Introduction of Chinese Medicinals, Classification of Chinese Herbs, Formulas, and Patent medicines.

Classifications of Herbs:Diuretics and Hydragogues Herbs:Herbs Diuretics.

 TCM Herbs Icon09 Introduction: Herbs Diuretics: also known as damp-draining diuretic herbs,an agent or substance herbs that increases urine excretion and water discharge for treating internal retention of dampness.

 
Stigma Maydis(Corn Stigma).

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

 Brief introduction: The herb Stigma Maydis is the dried styles and stigmata of Zea mays L.(family Gramineae), 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(Gramineae or true grasses family) family of the Poales order.

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

 Zea mays L. 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.

 Characters of herbs: The herb is often assembled into loose clusters, its style is linear or beaky, the complete one is about 30 mm long, about 0.5 mm in diameter, light green, yellowish-green to brownish red, shiny, slightly transparent, the stigma has 2 splits, forked, up to 3 mm long, soft. It is better to choose soft and shiny herbs.

 Pharmacological actions: The decoction of the herb Stigma Maydis has an obvious diuretic effect, can inhibit protein excretion. Its water extract, ethanol-water extract, ethanol infusion, and water decoction all have the effect of lowering blood pressure. It can promote bile secretion and excretion, reduce bile viscosity and bilirubin content. It also could 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: Internally:3~9 grams(CP),Internally:water decoction,1~2 liang(about 30~60 grams),or charred the herb with its property retained, grinded into fine powder.Externally:burn smoke and inhale it.(DCTM),Internally:water decoction, 15~30 grams, big dosage could be 60~90 grams,or charred the herb with its property retained,grinded into fine powder.Externally:burn smoke and inhale it.(CHMM).

 
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References:
  • 1.Introduction of Yu Mi Xu:Corn Stigma or Stigma Maydis.
  • 2.TCM Books:DCTM(Dictionary of the Chinese Traditional Medicine),CHMM(Chinese Herbal Materia Medica).

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