Polygonum capitatum
What's the taxonomical classification of Polygonum capitatum?
Polygonum capitatum belongs to the kingdom Plantae and is classified under the phylum Streptophyta. Within the class Equisetopsida, it is categorized under the subclass Magnoliidae. This plant follows the order Caryophyllales and is a member of the family Polygonaceae. Furthermore, it is placed within the genus Polygonum, specifically identified as the species capitatum.
| Taxonomic Rank | Classification |
|---|---|
| Kingdom | Plantae |
| Phylum | Streptophyta |
| Class | Equisetopsida |
| Subclass | Magnoliidae |
| Order | Caryophyllales |
| Family | Polygonaceae |
| Genus | Polygonum |
| Species | capitatum |
What are the morphological characteristics of this plant?
Polygonum capitatum has prostrate, creeping stems that form dense mats and small, ovate to lanceolate leaves with entire or slightly wavy margins. The plant's foliage is typically characterized by a fleshy texture and a greenish to reddish hue depending on environmental exposure. Tiny, inconspicuous flowers are arranged in compact, head-like clusters at the ends of the stems or within the leaf axils. These inflorescences produce small, dry fruits that facilitate the plant's spread across ground surfaces. The root system is fibrous and allows the species to stabilize itself within sandy or disturbed soils.
What is the geographical distribution of this plant?
This plant is native to the temperate and subtropical regions of East Asia, specifically found across parts of China, Japan, and Korea. It typically inhabits moist environments such as forest edges, riverbanks, and shaded woodland areas. The species thrives in varied elevations ranging from lowland plains to mountainous terrains. Its distribution is often influenced by the availability of consistent moisture and organic-rich soil. Local climate patterns in these Asian territories support its seasonal growth cycles.
How is this plant cultivated?
This plant, commonly known as water shield, is cultivated in shallow, flowing water or moist, nutrient-rich soil under bright, indirect sunlight.
Growers typically maintain water temperatures between 15 and 25 degrees Celsius to ensure optimal growth and prevent rot. It thrives in environments with consistent moisture and benefits from regular fertilization to support its rapid vegetative expansion. Because it spreads quickly through runners, managing its containment in ponds or garden beds is essential to prevent overgrowth.
Periodic thinning of the foliage helps promote fresh growth and maintains a healthy plant structure.
What parts of this plant are used medicinally?
This plant Polygonum capitatum is utilized medicinally through its leaves, roots, seeds, stems, and the whole herb. The leaves and stems are frequently processed into decoctions to treat inflammatory conditions and skin ailments. Medicinally active compounds found in the roots are often used to address digestive issues and promote detoxification. The seeds can be incorporated into specific traditional remedies to support various internal functions. Utilizing the whole herb allows for a synergistic effect of its diverse chemical constituents during therapeutic applications.
According to a study published by "Planta medica", the leaves and stems of Polygonum capitatum exhibit potent antioxidant properties. This species has a total antioxidant capacity of 74.60 mmol trolox/100 g dry weight (DW). Additionally, the phenolic content of Polygonum capitatum is 8.69 g gallic acid/100 g DW. The plant extracts contain major bioactive constituents such as flavonoids, phenolic acids and their derivatives, tannins, stilbenes, and anthraquinones. These parts of the plant serve as a potential resource of natural bioactive antioxidants.
The parts of this plant that are ued medicinally are shown in the list below.
- leaf
- root
- seed
- stem
- whole herb
What traditional systems uses this plant?
This plant, Polygonum capitatum, serves as a vital component in Hmong medicinal plants and Miao-nationality herbal medicine for treating various inflammatory and febrile conditions. Within the Hmong tradition, practitioners often utilize the plant to alleviate symptoms of heat-related illnesses and to support the body's natural detoxification processes. Similarly, Miao-nationality herbal medicine incorporates this species into complex formulas aimed at reducing swelling and treating skin ailments. Historical applications frequently involve using decoctions of the leaves or stems to manage digestive issues and promote general wellness. These traditional systems rely on the plant's specific chemical properties to restore balance within the patient's body.
According to a study published by "Molecules (Basel, Switzerland)", Polygonum capitatum is known by the Chinese name Tou Hua Liao and is a crucial source of Hmong medicinal plants. This folk-medicinal plant is widely distributed in the south-west of China for the treatment of various urologic disorders including urinary tract infections, pyelonephritis, and urinary calculus. Up until the end of 2022, at least 91 compounds had been reported from Polygonum capitatum. These reported compounds mainly cover the classes of flavonoids, lignanoids, phenols and other components.
The hystorical systems that uses this plant are shown in the list below.
- Hmong medicinal plants
- Miao-nationality herbal medicine
What are the pharmacological activities of Polygonum capitatum?
This plant has anti-hyperuricemia, diuretic, kidney stone treatment, urinary system infection treatment, and various urologic disorder treatment pharmacological activities. Its diuretic properties help increase urine output to flush out metabolic waste from the body. By lowering uric acid levels, it serves as an effective agent for managing anti-hyperuricemia. The plant also plays a crucial role in the treatment of kidney stones by preventing crystal formation. Furthermore, its medicinal components assist in the treatment of urinary system infections and the management of various urologic disorders.
According to a study published by "Molecules (Basel, Switzerland)", Polygonum capitatum has been used as an ethnic medicine to treat urinary tract infections, pyelonephritis and urinary calculi. The plant was also found to have anti-hyperuricemia effects. A total of 114 chemical components, such as phenolics, flavonoids, tannins, phenylpropanoids, amino acids and amides, were identified or tentatively characterized. This study detected an additional 66 different components compared to a previous Polygonum capitatum study. Furthermore, 68 related xenobiotics, consisting of 16 prototype components and 52 metabolites, were found in the plasma of hyperuricemia rats.
The primary pharmacological activities of this plant are shown in the list below.
- anti-hyperuricemia
- diuretic
- treatment of kidney stones
- treatment of urinary system infections
- treatment of various urologic disorders
What medicinal compounds this plant contains?
This plant contains a diverse array of bioactive medicinal compounds including flavonoids, tannins, phenolic compounds, lignoids, and flavonoid glycosides. These specific chemical constituents contribute significantly to its therapeutic potential and biological activities. The presence of phenolic compounds and tannins often provides strong antioxidant and antimicrobial properties. Furthermore, the flavonoid glycosides and other flavonoids play crucial roles in modulating various physiological processes within the body. Together, these complex molecules form the foundation of the plant's pharmacological profile.
According to a study published by "Molecules (Basel, Switzerland)", Polygonum capitatum is a crucial source of Hmong medicinal plants. Up until the end of 2022, at least 91 compounds had been reported from Polygonum capitatum. These reported compounds mainly cover the classes of flavonoids, lignanoids, phenols, and other components. The compounds and extracts isolated from the plant exhibit a wide range of pharmacological activities. These include anti-inflammatory, antioxidant, antimicrobial, anticancer, analgesic, hypothermic, and diuretic effects.
The primary medicinal compounds of this plant are shown in the list below.
- flavonoids
- tannins
- phenolic compounds
- lignoids
- flavonoid glycosides
What health conditions is this plant used for?
This plant is used for hyperuricemia, kidney stones, urinary calculi, urinary calculus, and various urinary system diseases. It functions primarily by promoting diuresis to help flush metabolic waste products from the body. This process is particularly effective for dissolving stones and reducing high levels of uric acid in the bloodstream. By supporting renal function, the herb helps alleviate symptoms associated with chronic urinary system diseases. Regular therapeutic application targets the root causes of stone formation to prevent future complications.
According to a study published by "Molecules (Basel, Switzerland)", Polygonum capitatum is used as an ethnic medicine to treat urinary tract infections, pyelonephritis, and urinary calculi. The plant was also found in a previous study to have anti-hyperuricemia effects. During the investigation, a total of 114 chemical components were identified or tentatively characterized. This included an additional 66 different components detected compared to the previous study. Furthermore, 68 related xenobiotics, consisting of 16 prototype components and 52 metabolites, were found in the plasma of hyperuricemia rats.
The main health conditions this plant is used for are shown in the list below.
- hyperuricemia
- kidney stones
- urinary calculi
- urinary calculus
- urinary system diseases
What are the herbal preparations of this plant?
This plant is processed into various medicinal herbal preparations including Polygonum capitaum extract, Relnqing granules, capsules, ethanol extracts, and powder. These different forms allow for diverse methods of administration and varying levels of concentration. The ethanol extracts are typically used to isolate specific active compounds through a solvent process. For oral consumption, the powder is often formulated into standardized capsules or convenient granules like Relnqing. Each preparation method serves to optimize the bioavailability and therapeutic application of the plant's medicinal properties.
According to a study published by "Evidence-based complementary and alternative medicine : eCAM", Polygonum capitatum has unique curative effects on the urinary system. Many Polygonum capitatum-based preparations are currently used in the clinic. In China, the combination of levofloxacin with a Chinese herbal preparation derived from Polygonum capitatum is used for the clinical treatment of urinary system diseases to improve curative effects and reduce side effects. When administered orally, the combination led to the urinary cumulative excretion of levofloxacin decreasing from 20.69% to 11.84% after 48 h. Additionally, the fecal cumulative excretion decreased from 26.08% to 13.28% at the 48 h mark.
The main herbal preparations of this plant are shown in the list below.
- Polygonum capitatum extract
- Relinqing® granules
- capsule
- ethanol extracts
- powder
What side effects this plant can have?
This plant can cause nausea, digestive upset, liver toxicity, and dizziness in individuals who consume it. Some users may experience gastrointestinal distress such as stomach pain or irregular bowel movements shortly after ingestion. More severe reactions include potential damage to liver function, which requires medical attention to monitor enzyme levels. Additionally, some people report feeling a sense of lightheadedness or dizziness during or after use. These adverse effects vary in intensity depending on the dosage and the specific individual's sensitivity.
The main side effects this plant can have are shown in the list below.
- Nausea
- Digestive upset
- Liver toxicity
- Dizziness
What herbs are paired with Polygonum capitatum?
This plant, commonly known as water bamboo or knotweed, is traditionally paired with herbs such as dandelion root, chrysanthemum, and licorice to enhance its cooling and detoxifying properties.
These combinations are frequently used in traditional Chinese medicine to address internal heat and promote urinary health. Adding dandelion root helps to increase the diuretic effect, while chrysanthemum provides additional anti-inflammatory benefits. Licorice is often included to harmonize the various herbal components and soothe the digestive system.
Together, these pairings create a balanced formula designed to cleanse the body of toxins.