Local names: Xuong bo, Thach xuong bo, Thuy xuong
bo
English name: Dwarf sedge, Japanese rush,
Japanese sweet flag, Grass-leaved sweet
rush.
Pharmaceutical Name: Rhizome Acori graminei
Description:
Perennial
semi-aquatic herb. Rhizome aromatic, creeping and much-branched. Leaves long
and amplexicaul, in fascicles; principal nerves parallel. Inflorescence in
spike on a compressed scape, surrounded by a long bract; flowers small,
bisexual. Berry bright-red when ripe.
Other species, such
as Acorus calamus L. and A. gramineus Soland. var. pusillus
Engl. are also used medicinally.
Part Used & Method for
Pharmaceutical Preparations:
The rhizomes are dug in early spring and cleaned and dried in the sun. When the
fresh rhizome is used for medical purposes, it should be dug in late summer.
Distribution: Grows wild on the banks of mountain
streams.
Chemical
composition:
The rhizome contains
an essential oil consisting of asaron and asaryl aldehyde; and a bitter glucoside,
acorin.
Therapeutic
uses:
The rhizome possesses
pectoral, stomachic and sedative properties. It is utilized in the therapy of
diarrhoea, gastralgia, cough, bronchial asthma, neurasthenia, fever,
convulsions, rheumatism, osteodynia and arrhythmia.
Indications & Combinations:
Indications & Combinations:
1.
Unconsciousness due to blockage of the
pericardium by turbid phlegm or accumulation of dampness and heat. Grass-leaved
sweetflag (Thach xuong bo) is used with fresh Bamboo juice (Truc nhu) and
Curcuma root (Uat kim) in the formula Xuong bo Uat kim Thang.
2. Dampness blocking the middle jiao (spleen
and stomach) manifested as stifling sensation, distension and pain in the chest
and abdominal region. Grass-leaved sweetflag (Thach xuong bo) is used with
Tangerine peel (Tran bi) and Magnolia bark (Hau Phac).
3. Damp-heat blocking the middle jiao
manifested as dysentery and vomiting after meals. Grass-leaved sweetflag
(Thach xuong bo) is used with Coptis root (Hoang lien).
4. Insomnia, forgetfulness, tinnitus and
deafness. Grass-leaved sweetflag (Thach xuong bo) is used with Polygala root
(Vien chi) and Poria (Phuc linh) in the formula Anshen Dingzhi Wan.
Dosage: The daily dose is 3 to 8g in the form
of a decoction, powder and pills, for a period of 1 to 2 months. External
application is effective for dermatosis and haemorrhoids. It is also used as an
insecticide for killing lice, bugs and fleas (double dosage for the
fresh herb).
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