Effect of oil of yi yi ren on striated muscles of frog: small amount can stimulate but large amount can suppress it.
Rosa Chinensis (月季)
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   | Rosa chinensis (Chinese name:月季, pinyin: yueji), known commonly as the China Rose,
is a member of the genus Rosa native to Southwest China in Guizhou, Hubei, and Sichuan Provinces.
It is a shrub growing to 1–2 m tall. The leaves are pinnate, with 3-5 leaflets, each leaflet 2.5–6 cm long and 1–3 cm broad. In the wild species (sometimes listed as Rosa chinensis var. spontanea),
the flowers have five pink to red petals. The fruit is a red hip 1–2 cm diameter.
The species is extensively cultivated in China as an ornamental plant; numerous cultivars have been selected, with varying flower colour and usually an increased number of petals (semi-double or double flowers). The species is also important in the breeding of many modern garden roses, including the Hybrid Tea roses.
The flowers and fruits are used in traditional Chinese medicine (TCM) in the treatment of irregular and/or painful menstruation, as well as swollen thyroid.
The rose hip, usually from R. canina is used as a minor source of Vitamin C. The fruits of many species have significant levels of vitamins and have been used as a food supplement. Many roses have been used in herbal and folk medicines. Rosa chinensis has long been used in Chinese traditional medicine. This and other species have been used for stomach problems, and are being investigated for controlling cancer growth.
In France there is much use of rose syrup, most commonly made from an extract of rose petals. In the United States, this French rose syrup is used to make rose scones and marshmallows.
Rose flowers are used as food, also usually as flavouring or to add their scent to food. Other minor uses include candied rose petals.
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