Ascyrum humifusum Labill.
Brathys caespitosa Blume
Brathys debilis Blume
Brathys humifusa Spach
Brathys japonica (Thunb.) Wight
Brathys laxa Blume
Brathys nepalensis Blume
Brathys orysetum Blume
Brathys radicans Blume
Hypericum calycatum Jacquem. ex Dyer
Hypericum cavaleriei H. Lév.
Hypericum chinense Osbeck
Hypericum laxum (Blume) Koidz.
Hypericum nervatum Hance
Hypericum pusillum Choisy
Hypericum scaturiginum Buch.-Ham. ex Wall.
Hypericum thunbergii Franch. & Sav.
Sarothra japonica (Thunb.) Y.Kimura
Sarothra laxa (Blume) Y.Kimura
Tridia frankenioides Korth.
Common Name: Matted St. John's Wort
Hypericum japonicum is a very variable, annual to short-lived perennial plant with erect to decumbent or prostrate stems that root at the base. It can grow from 2 - 50cm tall[
The plant is harvested from the wild for local use as a medicine.
The plant is suspected of causing photo-sensitization[
]. Feeding trials to livestock in New Zealand have shown that it is non-toxic[
E. Asia - China, Japan, Indian subcontinent, Myanmar, Thailand, Laos, Vietnam, Malaysia, Indonesia, Philippines to New Guinea, Australia, New Zealand
Wet places in lowland, C. and S. Japan. Rice fields, ditches, marshes, grasslands and waste places from sea level to around 3,000 metres[
]. Wet or marshy to dry localities, but always in exposed places, from sea-level up to 3,400 mtres[
Easily grown in any reasonably good well-drained but moisture retentive soil[
]. Succeeds in sun or semi-shade but flowers better in a sunny position. This species is found in the wild in wet soils.
A very variable species[
The plant is alterative, antiphlogistic, astringent, depurative, febrifuge, stomachic and vulnerary[
]. It is decocted with water for use[
]. It is used in the treatment of asthma and dysentery, acute hepatitis, pain in the liver region, appendicitis, boils and abscesses and has also been used as a styptic[
]. Combined with ginger (Zingiber officinale) and ash salt, it is used in the treatment of malaria[
]. The plant has also shown antitumour activity[
Applied externally, it is used to treat wounds, leech and snake bites, swellings, abscesses, scrofula and fungal skin diseases[
Seed - sow in a nursery seedbed. When they are large enough to handle, prick the seedlings out into individual pots and plant them out when large enough.
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