Rheum palmatum
What's the taxonomical classification of Rheum palmatum?
Rheum palmatum belongs to the kingdom Plantae and is classified within the phylum Streptophyta. As a member of the class Equisetopsida and the subclass Magnoliidae, this plant falls under the order Caryophyllales. It is further categorized into the family Polygonaceae, which places it within the genus Rheum, ultimately identifying it as the specific species Rheum palmatum.
| Taxonomic Rank | Classification |
|---|---|
| Kingdom | Plantae |
| Phylum | Streptophyta |
| Class | Equisetopsida |
| Subclass | Magnoliidae |
| Order | Caryophyllales |
| Family | Polygonaceae |
| Genus | Rheum |
| Species | palmatum |
What are the morphological characteristics of this plant?
Rheum palmatum has large, deeply palmately lobed leaves that can reach up to 60 centimeters in width and are characterized by a bright green color and prominent venation. These leaves grow from a thick, fleshy rhizome that serves as the plant's primary storage organ. The plant produces dense, branched panicles of small, creamy-white to yellowish flowers that emerge from the center of the leaf rosette. Its stems are sturdy and upright, supporting the heavy foliage and the expansive inflorescences. The overall structure is robust, allowing the plant to thrive in high-altitude alpine environments.
What is the geographical distribution of this plant?
This plant is native to the high-altitude regions of the Himalayas, spanning across parts of northern India, Nepal, Bhutan, and southwestern China. It typically thrives in montane environments found at elevations between 2,500 and 4,500 meters above sea level. These populations are often localized to moist alpine meadows and rocky slopes near glacial streams or mountain seepages. The specific environmental requirements of the species restrict its presence to these specialized subalpine and alpine zones. Consequently, its distribution is fragmented across the rugged terrain of the central and eastern Himalayan mountain ranges.
How is this plant cultivated?
This plant, Rheum palmatum, requires well-drained, fertile soil and a cool, moist climate to thrive during its growth cycle.
Growers must ensure the soil remains consistently damp but never waterlogged to prevent root rot. It prefers locations that receive full sun to partial shade, depending on the intensity of the local environment. Regular organic mulching helps maintain soil moisture and regulates temperature around the roots. During the winter months, the plant enters a period of dormancy and requires minimal care.
Proper spacing is essential to allow for the significant expansion of its large, broad leaves.
What parts of this plant are used medicinally?
This plant Rheum palmatum is utilized medicinally through its radix, rhizoma, aerial parts, leaf, and stem. The dried roots and rhizomes are the primary components used to produce anthraquinone glycosides for treating constipation. While the rhizome is the most potent part, the aerial parts are sometimes included in traditional preparations. The leaves and stems are less commonly used but can be part of various herbal formulations. These different components collectively provide the therapeutic properties necessary for digestive health.
According to a study published by "Yao xue xue bao = Acta pharmaceutica Sinica", the medicinal parts used are the Radix et Rhizoma Rhei (AELRR). The alcohol extracted liquid of the plant was analyzed using a C18 column measuring 4.6 mm x 250 mm with a 5 microm particle size. Detection was performed at a wavelength of 254 nm with a flow rate of 1 mL min(-1) at a temperature of 40 degrees C. The TQSM parameters for the AELRR included an AUC(T) of 3.273 x 10(8) microV s and an AUCPW(T) of 2.286 x 10(6) microV s mg (-1). Additionally, the MCRT(T) was 33.50 min, the VCRT(T) was 484.4 min2, and the total quantum concentration was 143.2 mg mL(-1).
The parts of this plant that are ued medicinally are shown in the list below.
- Radix
- Rhizoma
- aerial parts
- leaf
- stem
What traditional systems uses this plant?
This plant, Rheum palmatum, has been utilized for centuries across diverse medical traditions to treat digestive issues and promote bowel movements through its potent laxative properties. In the Indonesian Jamu tradition, its roots are often incorporated into herbal preparations designed to cleanse the digestive tract and balance bodily fluids. Practitioners of Kampo medicine in Japan similarly employ this species as a key component in complex formulas to resolve stagnation and regulate intestinal function. Within the framework of Persian hakim medicine, the plant is valued for its ability to purge toxins and address various internal ailments. These historical systems all recognize its significant pharmacological strength in managing gastrointestinal health.
According to a study published by "Journal of natural medicines", the methanol extract of Rheum palmatum exhibited ≥70 % inhibition at 25 μg/mL. This plant was one of 28 Indonesian medicinal plants screened for their protein tyrosine phosphatase 1B inhibitory activities. The study evaluated the inhibitory activities of 9 water extracts and 11 methanol extracts. These results suggest that such medicinal plants may contribute to the treatment and/or prevention of type II diabetes and/or obesity through PTP1B inhibition.
The hystorical systems that uses this plant are shown in the list below.
- Jamu
- Kampo
- Persian hakim medicine
What are the pharmacological activities of Rheum palmatum?
This plant has pharmacological activities including laxative, catharsis, purgative, cholagogue, and anti-inflammatory properties. Its high anthraquinone content allows it to function effectively as a stimulant laxative to relieve constipation. At higher dosages, it can act as a powerful purgative or catharsis to induce rapid bowel evacuation. The plant also serves a cholagogue function by stimulating the gallbladder to release bile into the digestive tract. Additionally, its bioactive compounds provide anti-inflammatory benefits that help reduce swelling and irritation in various tissues.
As discussed in a study, Rheum palmatum was known in Japan as Russian Rhubarb. This plant had spread from continental China to Europe via Russia. It was introduced to Japan to be used as a laxative when Dutch medicine arrived during the late-Edo period. The distribution of products derived from Rheum palmatum remained separate from other products following the Meiji era from 1868 to 1912.
The primary pharmacological activities of this plant are shown in the list below.
- laxative
- purgative
- anti-inflammatory
- anti-diarrheal
- cholagogue
What medicinal compounds this plant contains?
This plant contains anthraquinones, specifically emodin, rhein, physcion, and aloe-emodin, which serve as its primary medicinal compounds. These specific chemical structures are responsible for the plant's potent laxative and purgative effects. Researchers often study these constituents for their potential anti-inflammatory and antimicrobial properties. The presence of these various anthraquinone derivatives determines the therapeutic profile of the root extracts. Consequently, the concentration of these individual compounds can vary significantly based on the plant's growth environment.
According to a study published by "Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica", the plant Rheum palmatum contains anthraquinone compounds including emodin, physcion, and chrysophanol. These predominant anthraquinones were identified in the DH5a, DH5c, and NOR root types respectively. The research studied three specific clones of hairy roots, which were DH7a, DH5a, and DH5c. Among the four anthraquinones studied, aloe-emodin was found to have the lowest content in all root cultures. The study utilized two strains of A. rhizogenes, LBA9402 and R1601, to induce these hairy roots from leaf blades, hypocotyls, and petioles.
The primary medicinal compounds of this plant are shown in the list below.
- Rhein
- Emodin
- Aloe-emodin
- Physcion
- Chrysophanol
What health conditions is this plant used for?
This plant is used for treating constipation, diarrhea, and various other digestive diseases due to its potent pharmacological effects. It possesses significant laxative properties that help stimulate bowel movements when used in appropriate doses. Additionally, the plant exhibits strong purgative activity which can be utilized to clear the intestinal tract. Careful management of its usage is necessary to balance these intense effects on the gastrointestinal system.
According to a study published by "Phytomedicine : international journal of phytotherapy and phytopharmacology", Rheum palmatum is utilized for a wide range of pharmacological properties. The plant is used for its laxative, anti-diahrreal, neuroprotective, hepatoprotective, cardiovascular, antidiabetic, antitumor, anti-inflamatory, antiviral, and antibacterial effects. These medicinal capabilities are linked to 143 identified chemical compounds, including anthraquinones, anthrones, flavonoids, and chromones. The research synthesized developments from the period of 2014 to 2023 regarding these medicinal uses. These species provide both edible aerial parts and medicinal underground components that offer health benefits.
The main health conditions this plant is used for are shown in the list below.
- constipation
- laxative properties
- purgative activity
- digestive diseases
- diarrhea
What are the herbal preparations of this plant?
This plant is used to create diverse medicinal herbal preparations such as Rheum palmatum extract, Dachengqi decoction, San-Huang-Xie-Xin-Tang, Rhubarb-astragalus capsule, and Baoshen Pill. These formulations often leverage the plant's potent purgative properties to clear heat and resolve stagnation within the body. In traditional Chinese medicine, Dachengqi decoction and San-Huang-Xie-Xin-Tang are frequently utilized to treat severe internal heat and intestinal issues. Modern derivatives like the Rhubarb-astragalus capsule provide more standardized dosing for specific therapeutic goals. Each of these preparations varies in its combination of ingredients to balance the plant's intensity.
According to a study published by "Journal of ethnopharmacology", Rheum palmatum extract exerts anti-hepatocellular carcinoma effects by inhibiting signal transducer and activator of transcription 3 signaling. The SMMC-7721 and HepG2 HCC cell lines were treated with RP extract for 24 h to analyze various cellular functions. This RP extract reduced the viability, migration, and invasion of SMMC-7721 and HepG2 cells, while also reducing the angiogenesis of HUVECs. It suppressed the phosphorylation of STAT3 and its upstream kinases, including JAK2 and Src, while downregulating 10 STAT3 target genes such as survivin, Bcl-xL, Mcl-1, Bcl-2, MMP-2, MMP-9, Cyclin D1, CDK4, c-Myc, and VEGF-C. Furthermore, RP extract suppressed xenograft tumor growth and STAT3 activation in xenograft tumor mice.
The main herbal preparations of this plant are shown in the list below.
- Rheum palmatum extract
- Dachengqi decoction
- San-Huang-Xie-Xin-Tang
- Rhubarb-astragalus capsule
- Baoshen Pill
What side effects this plant can have?
This plant can cause serious health complications through anthraquinone toxicity, which triggers various forms of cellular and organ damage. The presence of these compounds is linked to carcinogenicity, potentially increasing the risk of tumor development in sensitive tissues. Furthermore, excessive consumption may lead to cytotoxicity, where the substances directly damage or kill living cells. The systemic effects also extend to organ-specific harm, specifically manifesting as hepatotoxicity in the liver and cardiotoxicity in the heart. These cumulative physiological risks necessitate caution when considering any medicinal application of the plant.
According to a study published by "Journal of ethnopharmacolgy", Rhei Radix et Rhizoma is a traditional laxative that is not recommended for long-term use. This recommendation is due to the side effects associated with anthraqquinones. The plant significantly increases fecal water content in constipated mice. Additionally, RRR elevates levels of gastrin (GAS) and somatostatin (SS). Research also indicates that RRR contributes to repairing the intestinal mucosa and decreasing aquaporin-3 expression.
The main side effects this plant can have are shown in the list below.
- anthraquinone toxicity
- carcinogenicity
- cardiotoxicity
- cytotoxicity
- hepatotoxicity
What herbs are paired with Rheum palmatum?
This plant, Rheum palmatum, is frequently paired with herbs such as Scutellaria baicalensis, Coptis chinensis, and Glycyrrhiza uralensis to balance its purgative effects and address heat patterns.
In traditional Chinese medicine, these combinations are often used to treat damp-heat conditions in the gastrointestinal tract. Scutellaria and Coptis are added to clear heat and dry dampness, while Glycyrrhiza serves to harmonize the various medicinal components. These strategic pairings ensure that the potent downward movement of the rhubarb is controlled and targeted effectively.
Such combinations are essential for managing inflammation and digestive irregularities safely.