Common Thatching Grass: A Comprehensive Reference
1. Identity and Nomenclature
The common name "common thatching grass" most precisely denotes Hyparrhenia hirta (L.) Stapf, a member of the family Poaceae (grasses). It is also known by the names "common thatching grass" and "Coolatai grass." In Afrikaans it is called dektamboekiegras, and it carries vernacular names in several southern African languages, including morulela (Sepedi/Northern Sotho) and intunga (Zulu). The genus Hyparrhenia is a genus of grasses, many species of which are known commonly as thatching grass; they are mostly native to tropical Africa, with some found in warmer areas in temperate Eurasia, Australia, and Latin America.
A closely related species, Hyparrhenia rufa (Nees) Stapf, carries the common names jaraguá grass and giant thatching grass and is sometimes encountered under the broader "thatching grass" label. It is native to Africa and is widespread in the world as a cultivated forage and fodder for livestock, as well as a naturalized and sometimes invasive species.
A second grass species sharing the "thatching grass" common name in wide use across Africa, Asia, and Oceania is Imperata cylindrica (L.) Raeusch. This is a perennial grass in the family Poaceae, known in different traditional medicines in Southeast Asia for the treatment of a wide range of infectious diseases. It is known across its range by a variety of local names: cogon grass or kunai grass in English-speaking contexts; alang-alang in Indonesian and Malay; and Bai mao gen (ç™½èŒ…æ ¹) in Chinese. The dried rhizomes of Imperata cylindrica have been commonly used in China named "Bai mao gen," in Korean named Mo-Geun-Chu-Chul-Mul, and in Japan as a crude drug named "Boukon (Imperata rhizome)."
Because both species share the "thatching grass" common name and appear in overlapping ethnobotanical literature, this article addresses each in its appropriate context, with an emphasis on Hyparrhenia hirta as the species most specifically designated "common thatching grass," and on Imperata cylindrica where its substantially larger pharmacological literature provides important parallel evidence for the broader category.
1.1 Taxonomic Synonymy
Hyparrhenia hirta is accepted as the correct binomial; the specific epithet hirta is Latin for "hairy" and refers to the hairy spikelets. Published synonyms for H. rufa include Sorghum rufum (Nees) Kuntze and Trachypogon rufus Nees, among others. The genus Hyparrhenia is made up of about 50 species, mostly of African origin, with some species widely distributed throughout the tropics.
1.2 Botanical Description and Distribution
Hyparrhenia hirta is a tufted, strongly rooted perennial grass that is mainly used as fodder and thatching material; it can also help control erosion and is considered a weed in some regions. It is a perennial, leafy, and variable species that grows to a height of 0.5–1 m (up to 1.8 m during blooming) and has a strong root system; its stems are wiry, arising from short rhizomes above a dense leafy tussock. The leaves are glaucous, glabrous or nearly so, and alternate, with a linear or folded leaf blade 2–20 cm long × 1–3 mm wide; the inflorescence is a loose spatheate panicle containing 2–10 pairs of pedicelled racemes, which bear 4–7 hairy spikelets of two types: pedicelled male or sterile spikelets, and sessile, fertile spikelets.
Hyparrhenia hirta is native to the Mediterranean Basin and to Africa, where it can be found in most countries except equatorial ones; it spread eastwards to the Middle East from Arabia to Pakistan, and westwards to Cape Verde; it was introduced as a potential pasture species in the Americas and in Australia in the 1950s, where it has since become a weed. The grass can grow in a variety of habitat types, including dry conditions, heavy, rocky, eroded soils, and disturbed areas.
1.3 Common Forms and Preparations
In traditional and folk medicine, both Hyparrhenia hirta and Imperata cylindrica have been prepared primarily as decoctions and infusions of the roots, rhizomes, or aerial parts. A rhizome decoction is usually drunk as a diuretic, used for coughs to purify the blood, and to treat dysentery, colic, hypertension, and venereal diseases. Modern scientific research has additionally employed methanolic extracts, ethanolic extracts, aqueous extracts, and ethyl acetate fractions of powdered plant material (especially root/rhizome) prepared using Soxhlet apparatus and related laboratory techniques. The existing literature indicates that these herbal preparations can be taken both internally and externally; the rhizome of Imperata has been recorded in multiple versions of the Chinese Pharmacopoeia, and is also traditionally used as a medicinal herb in Japan and Korea.
2. Traditional and Historical Use
2.1 Sub-Saharan Africa
Hyparrhenia hirta occupies a central position in southern African material culture and traditional medicine. Hyparrhenia hirta is probably the most popular thatching grass used in South Africa; it is grazed by livestock early in the growing season and after fires, but becomes less palatable for grazing later. Common thatching grass is the main thatching material in South Africa; for fine thatching, the stems must comply with quality standards including a diameter between 1.2 and 2.5 mm at the butt end, a length above 0.8 m, and absence of seeds and loose material. In South Africa and the USA, this grass is seen as a drought-resistant plant that protects the soil and stabilizes hard, gravelly soil and eroded places; it is also used to weave mats and baskets.
Beyond its structural applications, African traditional medicine has employed grasses of this and related genera as remedies. A study aimed at evaluating phytochemical potential and antioxidant activity of 13 grasses documented during an ethnobotanical survey as remedies in South African traditional medicine noted that there is very little scientific pharmacological and phytochemical evidence available for their use in traditional medicine. The ethnobotanical literature from Africa records decoctions of the rhizome being consumed for diuretic, anti-inflammatory, and blood-purifying purposes. The root is chewed in Uganda to treat snakebites, a root decoction is taken in Namibia to treat jaundice and digestive problems, and a crushed root infusion is taken in southern Africa to treat hiccups and indigestion.
2.2 Southeast Asia
Imperata cylindrica has the longest and most documented history of medicinal use in Southeast Asia, where it has been applied across multiple traditional medical systems. The flowers and roots have been used as antibacterial, diuretic, skin-softening (emollient), antipyretic (febrifuge), salivating (sialagogue), anticoagulant (styptic), and soothing (tonic) agents; the roots are specifically used for the treatment of jaundice, edema, and hematological disorders such as hematuria, hematemesis, and epistaxis.
In Southeast Asia and Africa, alang-alang is used in traditional medicine for treating a wide range of ailments; its rhizome is used for treating blood system disorders, nausea, indigestion, and jaundice; in China the rhizome is used as a diuretic, a restorative tonic, and to stop bleeding; in Southeast Asia it is used for treating diarrhoea and dysentery.
2.3 Traditional Chinese Medicine (TCM)
In TCM, the use of the rhizome of Imperata cylindrica (known as Rhizoma Imperatae or Bai mao gen) is ancient and well-documented. In traditional Chinese medicine, the rhizome of Imperata could be used either alone or in combination with other herbal medicines to cure hematuresis, jaundice with damp-heat pathogen, emesis, hemorrhage, and to reduce fever and cause diuresis, anti-fever, and anti-inflammatory effects; a variety of classical formulas containing I. cylindrica are widely used in the TCM clinic. A combination of I. cylindrica, Panax quinquefolius, Rehmannia glutinosa, and Wolfiporia cocos is commonly used for the treatment of hematuresis; the combination of I. cylindrica, Artemisia capillaris, and Gardenia jasminoides could significantly dispel dampness and heat, and is used widely in jaundice with damp-heat pathogen.
2.4 South Asian Traditions (Mizo Tribal Medicine)
Among the Mizo tribes of northeastern India, the leaves are used as the main construction material for thatched roofs in traditional houses, and the rhizome-roots are used directly as anthelmintic agents; crushed and juiced, or directly chewed, they are consumed for the treatment of intestinal infections, and are known to be effective against both tapeworm and roundworm species.
2.5 Japan and Korea
In Japan, I. cylindrica rhizome (Boukon) is used as a crude drug. The stems are used in a proprietary anti-tumour preparation in Japan. In Korea, the dried rhizome is employed under the designation Mo-Geun-Chu-Chul-Mul, and the plant has been recorded across multiple pharmacopoeial traditions in East Asia.
3. Key Constituents and Active Compounds
3.1 Hyparrhenia hirta — Phytochemical Profile
The phytochemical profile of H. hirta has been investigated primarily through chromatographic separation of methanolic extracts. Studies report isolation of flavonoids including 3-O-methylquercetin, tangeritin, luteolin-7-O-glucoside, luteolin, apigenin-7-O-glucoside, apigenin-8-C-glucoside, luteolin-8-C-glucoside, luteolin-6-C-glucoside, diosmetin, and catechin from the methanolic extract of Hyparrhenia hirta, identified using high performance liquid chromatography and liquid chromatography–electrospray ionization–tandem mass spectrometry.
The total phenolic content of the H. hirta extract was 105.58 ± 0.1 mg gallic acid equivalents/g of plant extract, the total flavonoid content was 45.20 ± 0.2 mg quercetin equivalents/g of plant extract, and the total condensed tannins were 72.35 ± 0.7 mg catechin equivalents/g of plant extract.
Trace metal analyses have also been carried out on H. hirta collected from the Eastern Cape, South Africa, with the aim of determining trace metal concentrations in selected traditional plants consumed in the region. The general phytochemical profile of southern African medicinal grasses in the family Poaceae includes condensed tannins, total soluble phenolics, flavonoids, and iridoids. In one study of South African medicinal grasses, total soluble phenolic content ranged from 4.2 to 30.9 mg GAE/g DW.
3.2 Imperata cylindrica — Phytochemical Profile
Imperata cylindrica has been far more extensively investigated at the phytochemical level than H. hirta. It is a medicinal plant native to southwestern Asia and the tropical and subtropical zones; to date, 72 chemical constituents have been isolated and identified from I. cylindrica, and among these compounds saponins, flavonoids, phenols, and glycosides are the major constituents.
A 2023 comprehensive review identified 43 phytochemicals isolated by various investigators mainly from the roots of I. cylindrica, which could be classified as bioactive phenolic compounds (coumarins, flavonoids, phenols, lignan glycosides, nor-lignans, phenolic acids, and aurone), along with terpenoids (sesquiterpenoids and triterpenoids), steroids, and phytosterols.
Triterpenoids (Saponins)
The plant contains multiple triterpenoids; to date, 16 triterpenoid compounds have been isolated from I. cylindrica, most of which are pentacyclic triterpenoid sapogenins; the basic skeleton of the pentacyclic triterpenoid sapogenins can be divided into fernane and arborane types; arundoin (1) and cylindrin (2) are the first set of compounds isolated, which were methyl ethers of fernane-type pentacyclic triterpenoid sapogenins, and friedelin (9) is an arborane-type pentacyclic triterpenoid saponin.
Flavonoids
Flavonoids are a typical category of compounds present in I. cylindrica plants; among them, mainly chromone and other characteristic flavonoid structures have been identified; the chromone compounds numbered 28, 29, 32, and 36 have been isolated from I. cylindrica. Screening of ethanol extracts of I. cylindrica showed the presence of tannins, saponins, flavonoids, alkaloids, cardiac glycosides, coumarin, and terpenoids; it has been demonstrated that I. cylindrica is a good source of antioxidants with high flavonoid and total phenolic compound content; rhizome extracts are also rich in polyphenols that exhibit antioxidant activity.
Other Constituents
Additional compounds identified include carbohydrates, flavanoids, tannins, alkaloids, glycosides, saponins, and steroids in the roots; twelve phenolic compounds comprising coumarins, flavonoids, phenolic acids, and lignans have been isolated from I. cylindrica.
4. Established Mechanisms of Action
4.1 Antioxidant Mechanisms
The antioxidant activity of H. hirta extracts has been documented through multiple in vitro assays. Antioxidant activity of the H. hirta extract has been assayed through the antioxidant capacity by phosphomolybdenum assay, the reducing power assay, and the radical scavenging activity using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method. In I. cylindrica, the antioxidant capacity of the rhizome extract has been attributed to its polyphenolic content. The rhizome (Rhizoma Imperatae) has shown antioxidant capacities comparable to those of ascorbic acid, probably owing to the presence of high polyphenolic content; the methanolic root extract exhibited strong antioxidant activities with IC₅₀ ranging from 185 to 400 μg/ml.
4.2 Cholesterol-Lowering and Lipid Mechanisms
Compounds contained within the ethanol extracts of I. cylindrica include flavonoids and saponins; saponin binds with cholesterol and bile to form strong complex compounds that cannot be reabsorbed, resulting in cholesterol elimination and increased bile excretion.
4.3 Anticancer / Antitumour Mechanisms
The roots and leaves of I. cylindrica act as cytotoxic agents against several sensitive and resistant primary cancers through apoptosis induction, G1 cell cycle arrest (roots), and G2/M cell cycle arrest (leaves); the root extract prevents metastasis invasion through inhibition of the PI3K/AKT/Snail pathway and the epithelial-to-mesenchymal transition (EMT) process via modulation of certain key genes.
4.4 Antimicrobial Mechanisms
I. cylindrica tackles the growth of sensitive and multidrug-resistant (MDR) pathogenic microorganisms from various species and potentiates the antimicrobial activities of certain families of antibiotics towards MDR bacterial strains.
5. Scientific Evidence by Area of Use
Important caveat: The great majority of existing scientific evidence for both Hyparrhenia hirta and Imperata cylindrica derives from in vitro (cell culture) and in vivo animal (rodent) studies. No peer-reviewed randomized controlled clinical trials in humans have been identified for these species in the literature searched. All evidence described below should be understood as preclinical unless otherwise stated.
5.1 Antioxidant Activity
Evidence level: In vitro only; preliminary.
The flavonoid-rich methanolic extract of H. hirta has been studied in vitro for antioxidant potential. Researchers isolated 3-O-methylquercetin, tangeritin, luteolin-7-O-glucoside, luteolin, apigenin-7-O-glucoside, apigenin-8-C-glucoside, luteolin-8-C-glucoside, luteolin-6-C-glucoside, diosmetin, and catechin from the methanolic extract of Hyparrhenia hirta; the total phenolic content was 105.58 ± 0.1 mg gallic acid equivalents/g, the total flavonoid content was 45.20 ± 0.2 mg quercetin equivalents/g, and the total condensed tannin content was 72.35 ± 0.7 mg catechin equivalents/g; antioxidant activity was measured through the phosphomolybdenum assay, reducing power assay, and DPPH radical scavenging. These figures represent purely laboratory measurements and no clinical relevance has been established.
5.2 Antimicrobial Activity
Evidence level: In vitro and limited animal studies; preliminary.
The plant extract of I. cylindrica was effective against all bacteria tested, including Gram-negative bacteria such as Pseudomonas aeruginosa and Klebsiella pneumoniae, and the Gram-positive bacterium Bacillus subtilis; it was also effective against two avian intestinal worms, the tapeworm Raillietina echinobothrida and the roundworm Ascaridia galli; these findings reveal the importance of this plant as a source of therapeutic compounds. The antifungal properties of the plant have also been noted in the context of traditional use against ringworm and skin infections. It is used in different traditional medicines in Southeast Asia for the treatment of a wide range of infectious diseases, particularly bacterial infections, and is also used as an antifungal remedy in ringworm and other skin infections. No human clinical trials on antimicrobial outcomes have been published.
5.3 Anti-inflammatory Activity
Evidence level: In vitro and in vivo animal studies; preliminary.
Investigations of the pharmacological activities of I. cylindrica revealed that this edible medicinal herb exhibits a wide range of therapeutic potential including immunomodulatory, antibacterial, antitumor, anti-inflammatory, and liver protection activities both in vivo and in vitro. The anti-inflammatory mechanism in the Poaceae family has been linked to flavonoid and flavone derivatives that modulate pro-inflammatory gene expression. The plant is traditionally employed as an anti-inflammatory agent across multiple cultures, but robust human evidence is absent.
5.4 Antitumour / Anticancer Activity
Evidence level: In vitro and in vivo animal studies; preliminary.
Numerous studies have revealed the usefulness of I. cylindrica to fight against several diseases including primary cancers, microbial infections, hypertension, and others; phytochemical investigations of this plant have led to the isolation of various pharmacologically active compounds. Cell line research using the ethyl acetate extract of aerial parts has demonstrated activity in colorectal cancer models. The ethyl acetate extract of I. cylindrica aerial parts induced apoptosis of HT-29 colorectal carcinoma cells. Research into the anticancer mechanism has implicated cell cycle arrest and anti-metastatic pathway inhibition. The root and leaf extracts act as cytotoxic agents against several sensitive and resistant primary cancers through apoptosis induction, G1 and G2/M cell cycle arrest, and the root extract prevents metastasis via inhibition of the PI3K/AKT/Snail pathway and EMT. All published anticancer work is preclinical; no human oncology trials have been conducted with these extracts.
5.5 Lipid-Lowering (Hypocholesterolaemic) Activity
Evidence level: In vivo animal studies; preliminary.
Cogon grass (I. cylindrica) is a member of the Gramineae family; though often considered useless and treated as a weed, it is widely utilized within traditional medicine, particularly in Asia; various studies have shown that it exhibits numerous beneficial biological properties due to glycoside, triterpenoids, flavonoids, phenolic compounds, tannins, and proteins, which display antioxidant properties in vitro; cogon grass reeds are also considered a potential alternative medication to treat hypercholesterolaemia. The proposed mechanism involves saponin-mediated binding to cholesterol and bile acids. Saponin binds with cholesterol and bile to form strong complex compounds that cannot be reabsorbed, resulting in cholesterol elimination and increased bile excretion. The evidence for lipid-lowering activity is currently confined to animal models and in vitro findings.
5.6 Antihypertensive Activity
Evidence level: Traditional use with supportive in vitro/animal evidence; no clinical trials.
The plant also has significant antihypertensive, anti-hyperglycaemic, anti-parasitic, and antioxidant activity, and several other pharmacological properties. The roots of I. cylindrica have been described in traditional herbal medicine in the treatment of hypertension. Imperata cylindrica is traditionally used as a diuretic, anti-inflammatory, neuroprotective, and immunomodulatory agent.
5.7 Anthelmintic Activity
Evidence level: In vitro and limited in vivo; preliminary.
Although regarded as a noxious weed, I. cylindrica is recognised in Southeast Asian cultures as an antibacterial, anticoagulant (styptic), antipyretic, diuretic, emollient, sialagogue, and blood-soothing (tonic) agent; its effects on the circulatory system, such as vasodilation and blood flow, have also been reported. While most anthelmintic drugs are helminth-specific, I. cylindrica is acclaimed to be equally effective against both tapeworms and roundworms. Laboratory studies confirmed in vitro activity against tapeworm and roundworm species, but no controlled human trials have been conducted.
5.8 Diuretic Properties
Evidence level: Traditional use only; no clinical trials identified.
Diuretic use is one of the most consistently reported traditional applications across multiple cultures. In China, the rhizome is used as a diuretic, a restorative tonic, and to stop bleeding. This use is corroborated by the presence of flavonoids and saponins in the plant, but no controlled clinical studies have measured diuretic outcomes in humans.
5.9 Liver Protection
Evidence level: In vitro and animal studies only.
Liver-protective effects have been included in the documented pharmacological profile of I. cylindrica. The edible medicinal herb exhibits a wide range of therapeutic potential including immunomodulatory, antibacterial, antitumour, anti-inflammatory, and liver protection activities both in vivo and in vitro. No human clinical data on hepatoprotective effects have been identified.
6. Body Systems and Health Areas
- Cardiovascular / Haematological system: Traditional use for hypertension, haematuria, haematemesis, epistaxis, and purifying the blood; in vitro and animal evidence for cholesterol-lowering and anticoagulant properties.
- Gastrointestinal system: Traditional use for dysentery, diarrhoea, jaundice, indigestion, nausea, colic, and hiccups; the rhizome is used for treating blood system disorders, nausea, indigestion, and jaundice.
- Urinary system: Established traditional use as a diuretic; in TCM the rhizome is used to cause diuresis.
- Immune / Inflammatory system: Anti-inflammatory and immunomodulatory activity documented in cell and animal models. The plant is traditionally used as an anti-inflammatory and immunomodulatory agent.
- Oncological (preclinical): Cytotoxicity against multiple human cancer cell lines demonstrated in vitro and in mouse xenograft models; no clinical evidence.
- Infectious disease: Antibacterial, antifungal, and anthelmintic activity in vitro and in limited animal studies. The plant is known in different traditional medicines in Southeast Asia for the treatment of a wide range of infectious diseases, particularly bacterial infections.
- Dermatological system: Traditional use for skin infections including ringworm; antifungal activity observed in vitro.
- Neurological system: The plant is traditionally used as a neuroprotective agent, though specific mechanistic or clinical evidence is lacking.
7. Dosage Forms and Reported Dosages
No established standardized dosage for Hyparrhenia hirta or Imperata cylindrica has been confirmed in any pharmacopoeia or regulatory health body monograph for human supplemental use. The dosages below are reported solely as they appear in peer-reviewed research or pharmacopoeial records and must not be interpreted as recommended human doses.
- Rhizome decoction (TCM): The rhizome of Imperata cylindrica (Bai mao gen) is recorded in the Chinese Pharmacopoeia for internal use in classical TCM formulas, used either alone or in combination. The rhizome of Imperata has been recorded in multiple versions of the Chinese Pharmacopoeia and is also traditionally and ethnically used as a medicinal herb in Japan and Korea. Specific dried-weight doses as specified in the Chinese Pharmacopoeia were not captured in the retrieved source texts.
- Acute oral toxicity study (animal): The plant extract was administered orally to female rats at a single dose of 5,000 mg/kg for 14 days and the animals were observed for any behavioral changes or mortality.
- Sub-chronic oral toxicity study (animal): ICR (methanol root extract) was orally administered daily to male and female rats at different doses of 250, 500, and 1,000 mg/kg per body weight for 30 days.
- Methanolic extract (in vitro antioxidant study): Studies on H. hirta extracts report flavonoid and phenolic content per gram of dry plant extract (as described in the phytochemistry section above), but do not specify human-equivalent oral doses.
- Antioxidant IC₅₀ values (in vitro, I. cylindrica rhizome): The methanolic root extract exhibited strong antioxidant activities with IC₅₀ ranging from 185 to 400 μg/mL.
8. Safety Considerations and Interactions
8.1 Toxicological Evidence
Formal toxicity testing of Imperata cylindrica root extract has been conducted in rodent models using OECD-standardized protocols. From the results of the acute oral toxicity assay, ICR (the methanol root extract) was found to be non-toxic at the dose of 5,000 mg/kg body weight; during the period of the sub-chronic toxicity test, observation of signs, behavior, and health status of the animals showed no abnormality in the groups of animals treated with ICR as compared to controls.
However, at higher sub-chronic doses, some organ-level changes were observed. Significant variation in the relative body weights of heart and kidney were observed at a dose of 1,000 mg/kg body weight; significant decreases of aspartate aminotransferase, creatinine level, low-density lipoprotein concentration, triglyceride, and total cholesterol were observed; in males, a significant decrease in the level of granulocytes with an increase in lymphocytes and mean corpuscular haemoglobin concentration was noted; histological examinations on kidney and liver showed a normal kidney architecture but the liver presented a normal hepatic architecture with slight degeneration at the 1,000 mg/kg dose.
The investigators concluded that ICR is safe for acute oral administration; however, for long-term oral administration, safety measures should be taken; oral sub-chronic exposure at lower doses is recommended, while higher doses around 1,000 mg/kg body weight should be discouraged.
8.2 Comparative Safety Assessments
Various studies have characterized the Imperata cylindrica root extract as non-toxic, and the plant also has significant antihypertensive, anti-hyperglycaemic, anti-parasitic, and antioxidant activity. However, the context of these designations is animal and cell-based research, and extrapolation to human therapeutic safety has not been validated through clinical trials.
8.3 Absence of Clinical Safety Data for Hyparrhenia hirta
No formal clinical toxicology studies, drug interaction studies, or adverse event reports have been identified in the peer-reviewed literature specifically for Hyparrhenia hirta as a medicinal agent or dietary supplement. The scientific pharmacological and phytochemical evidence available for the use of South African medicinal grasses in traditional medicine is very limited.
8.4 Silica Content — Physical Hazard
The leaf edges of Imperata cylindrica are fine-toothed and embedded with sharp silica crystals, a physical property relevant to any consideration of direct consumption of leaf material, as sharp silica micro-particles may irritate mucosal surfaces.
8.5 Limitations of Safety Assessment
The entirety of safety data available for both species is derived from in vitro or rodent studies. No human pharmacokinetic data, drug interaction studies, or information on interactions with prescription medications has been identified in the sources reviewed. No government or regulatory health body (NIH, NCCIH, EMA, EFSA) has issued a formal safety assessment monograph for H. hirta or I. cylindrica as a dietary supplement ingredient. The Chinese Pharmacopoeia recognizes the I. cylindrica rhizome as a traditional medicinal material, but this recognition is based on traditional use precedent rather than modern clinical safety trials.
9. State of Evidence: Summary Assessment
The collective body of research on common thatching grass (Hyparrhenia hirta) and the closely related thatching grass Imperata cylindrica is characterised by the following:
- A rich and multi-cultural history of traditional use spanning sub-Saharan Africa, Southeast Asia, East Asia, and South Asia, with applications ranging from structural (thatching) to medicinal (diuretic, haemostatic, anti-inflammatory, anthelmintic, antipyretic).
- For H. hirta specifically, a modest but growing body of in vitro phytochemical and antioxidant evidence, with no clinical human studies identified.
- For I. cylindrica, a substantially larger and more mechanistically detailed body of preclinical evidence spanning antimicrobial, antitumour, anti-inflammatory, antioxidant, lipid-lowering, and antihypertensive domains — all at the in vitro or animal study level.
- Numerous studies have revealed the usefulness of I. cylindrica to fight against several diseases including primary cancers, microbial infections, hypertension, and others, and phytochemical investigations have led to the isolation of various pharmacologically active compounds.
- No peer-reviewed randomized controlled clinical trials in humans have been published for either species to the extent retrievable from authoritative scientific databases.
- The overall evidence base is preliminary. Preclinical results are promising in several areas but require validation through well-designed clinical studies before any therapeutic claims can be substantiated.
References
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