In our traditional culture, snakes embody the imagery of spirituality, wisdom, and the endless cycle of life. They are not only revered in folklore as mystical creatures that repay kindness by delivering herbs, but are also celebrated in traditional Chinese medicine texts as excellent remedies for dispelling wind and unblocking channels. In addition to the medicinal use of snakes themselves, there are also Chinese medicinal herbs named after snakes. These herbs not only possess unique therapeutic value but also carry moving stories and profound symbolism. Today, An'an is going to introduce to everyone a herb that sounds imposing yet is actually delicate and fragile—the “snake medicine” herb, Hedyotis diffusa.
In ancient times, there was a renowned physician who treated a gravely ill patient suffering from severe chest and back pain, persistent low fever, and coughing up purulent sputum—conditions for which all other doctors had no effective remedy. Exhausted by his fruitless efforts, the physician took a short rest and dreamt of a woman in white who said, “This person is kind-hearted and often rescues snakes by releasing them; please give your utmost effort to save him.” The woman then led him outdoors and transformed into a white-flowered snake. Wherever the snake’s tongue touched the ground, clusters of small herbs sprouted. Awakening in shock, the physician called his family to go outside, and sure enough, he found the field’s edge covered with slender herbs bearing white flowers. He quickly gathered them to prepare a decoction. After the patient took the medicine, his symptoms greatly diminished, and after several days of treatment, he recovered completely. The physician searched through classical texts but could not find the herb’s name, so he composed a poem:
From then on, the name “Hedyotis diffusa” became widely known.
Hedyotis diffusa is a commonly found Chinese herb in the southern regions. It is so named because its flowers are white and its leaves are slender with short, pointed tips, resembling a snake’s tongue. Not only does its name relate to snakes, but it is also an excellent remedy for treating venomous snake bites. There is a folk saying that “where venomous snakes roam, an antidote will grow,” and Hedyotis diffusa is one of the commonly used remedies for snake venom. Because it is effective against various venomous snake bites, it has also earned the nickname “Snake Supervisor.”
Hedyotis diffusa is the whole herb of a plant in the Rubiaceae family. It has a sweet and bitter taste and is associated with the Heart, Liver, and Spleen meridians. It possesses the functions of clearing heat and detoxifying, promoting diuresis and reducing swelling, as well as invigorating blood circulation and relieving pain. The herb was first recorded in the Guangxi Materia Medica, which describes it as “having a bitter-sweet taste, warm in nature, non-toxic; it enters the Heart, Liver, and Spleen meridians. It is used to treat pediatric malnutrition, venomous snake bites, and tumors, and externally to treat white pustules and snake scabies.” As a medicinal herb, Hedyotis diffusa is mainly used throughout the southern regions.
It is commonly used for treating boils, abscesses, and ulcerous infections, as well as sore throats, venomous snake bites, and painful urination due to heat. When treating abscesses caused by the accumulation of heat toxins, the fresh herb can be pounded and applied externally on its own, or used in combination with other heat-clearing and detoxifying herbs such as honeysuckle and forsythia. For urinary difficulties caused by damp-heat accumulation, it is often used together with diuretic herbs like plantain and white cogon grass.
Modern studies have shown that Hedyotis diffusa contains active components such as flavonoids, triterpenes, anthraquinones, cyclohexene ether glycosides, and polysaccharides. It exhibits a range of pharmacological effects including anti-tumor, antibacterial, anti-inflammatory, antioxidant, and immune-enhancing properties, with its anti-inflammatory effects being particularly prominent.
Clinically, Hedyotis diffusa is often used either as a single herbal remedy or in combination with other herbs to treat various inflammations, and it can also be processed into formulations to enhance clinical efficacy. Due to its relatively few adverse reactions, in some regions its extract is even used to produce mineral water or tea beverages. For example, “Laoshan White Flower Snake Grass Water” is made by adding the extract of Hedyotis diffusa.
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