Blepharis

Blepharis: A Comprehensive Encyclopedic Reference

1. Botanical Identity and Taxonomy

Blepharis is a genus of flowering plants in the family Acanthaceae (order Lamiales). The genus contains around 126 species found in seasonally dry to arid habitats. It is an Afro-Asiatic genus comprising about 126 species that occur in arid and semi-arid habitats. The genus name derives from the Greek blepharis (eyelash), a reference to the fringed bracts of the flowers.

Among the many species in the genus, several are of primary medicinal and ethnobotanical interest. Seven species have been reported frequently as useful in folklore in African and Asian countries. B. maderaspatensis was found to be widely used in Indian traditional medicines, whereas B. ciliaris and B. edulis were common in the folklore of Egypt, Jordan, and Arabia. Other species attracting scientific attention include B. linariifolia, B. scindica (also known as B. sindica), and B. molluginifolia.

Key Species Profiles

• Blepharis maderaspatensis (L.) B. Heyne ex Roth — Synonyms include Blepharis boerhaavifolia and Acanthus maderaspatensis L. It has been recognized by the names Utinjan, Otigan, Utagan, and Chatushpatri in Hindi, Gujarati, Marathi, and Sanskrit, respectively. It is a diffuse, creeping herb found primarily in India.
• Blepharis edulis (Forssk.) Pers. — A perennial shrub reaching 30–70 cm in height. Widely distributed among Asian and African countries. In Asia, it is found in Pakistan, Iran, India, and Afghanistan. It is also known as Utangan and Elsihaa.
• Blepharis ciliaris (L.) B.L. Burtt — Prevalent in the Middle East, including Egypt, Jordan, Arabia, and the Saharo-Arabian region; also used in Bedouin traditional medicine in Saudi Arabia.
• Blepharis linariifolia Pers. — Found in Sudan and other parts of Africa; used in traditional medicines as a general tonic and for the treatment of various health problems in Sudan.
• Blepharis sindica T. Anders — Found in India (Rajasthan, Gujarat); an important medicinal plant used as an invigorating tonic, given to cattle to increase milk production, and with roots used for urinary discharge and dysmenorrhoea; extensively used traditionally as an aphrodisiac by local Vaidyas of Rajasthan and Gujarat.

Botanical Description

Blepharis maderaspatensis is a diffuse herb with a creeping rootstock. Its leaves are lanceolate, rough to touch, and edged with small spines. The flowers emerge in dense spikes, pale mauve to violet, often seen in sandy soils. Regions from Rajasthan's Thar desert to parts of Sudan host this plant, where it adapts to drought by developing thick roots.

Common Preparations and Dosage Forms

Blepharis species are employed in a variety of preparation forms across traditional and emerging scientific contexts:

• Aqueous decoctions — made from aerial parts, roots, or seeds; used most commonly in Ayurvedic and folk practice for internal complaints.
• Leaf pastes and poultices — applied topically. The paste of the leaves is mixed with lime juice and applied on cuts.
• Plant infusions — in folk medicine, coughs and asthma are treated with an oral infusion of the plant's leaves, roots, and seeds.
• Ethanolic, methanolic, and chloroform extracts — used primarily in laboratory and preclinical research settings.
• Whole aerial part extracts — used for antioxidant and antimicrobial investigation.

2. Traditional and Historical Use

Indian Subcontinent (Ayurveda, Siddha, and Tribal Medicine)

In Ayurveda, Blepharis maderaspatensis is the species of original Utingan as stated in classical texts. Blepharis maderaspatensis is used for the treatment of a number of ailments including dysuria, headache, diseases of the nervous system, and as a diuretic and aphrodisiac.

Some species of Blepharis are used in traditional medicines in different countries, mainly for their anti-inflammatory and wound healing activities, along with treatment of gastrointestinal disorders and bone fractures. Tribal communities in South India, including the Paliyar community, have been documented using B. maderaspatensis. The review literature suggests the similar uses and nomenclature of B. maderaspatensis to Blepharis edulis as mentioned in the Wealth of India. B. maderaspatensis has rich phytoconstituents and varied pharmacological activities. Further, it has similar uses as Blepharis edulis mentioned in the Wealth of India.

Blepharis edulis is traditionally used as an antiseptic, purgative, aphrodisiac, and anti-inflammatory agent. In India, it is used as a traditional medicine for treating skin diseases, as a diuretic, and for treating fever.

Egypt, Arabia, and the Middle East

Species including B. ciliaris, B. edulis, B. linariifolia, B. scindica, and B. maderaspatensis are extensively utilized in traditional medicine across various African and Asian countries for the treatment of a range of infectious and chronic diseases, inflammatory conditions, skeletal disorders, and parasitic problems.

B. ciliaris holds particular prominence in Bedouin traditional medicine in Saudi Arabia. The arid mountainous region of Hail in Saudi Arabia has a variety of desert vegetation, some of which are conventionally used in Bedouin traditional medicine. It is used for eye complaints and as an ocular treatment. It is also used as an ocular treatment to enhance eyesight.

Sudan and Sub-Saharan Africa

The plant infusion of B. linariifolia is used as a general tonic, and for the treatment of stomach pain and bilharzia. Moreover, the water extract of the fruits is used for urinary disorders and kidney stones. In Sudan, the whole plant of B. ciliaris is used as a poultice for swelling and wound treatment.

Respiratory and Multi-System Uses

Multiple Blepharis species are extensively utilized in traditional medicine across various African and Asian countries for the treatment of a range of infectious and chronic diseases, inflammatory conditions, skeletal disorders, and parasitic problems. In folk medicine, coughs and asthma are treated with an oral infusion of the plant's leaves, roots, and seeds.

3. Key Chemical Constituents and Active Compounds

The phytochemistry of Blepharis is species-specific, with distinct compound profiles found across the genus. Active phytochemicals of Blepharis are flavonoids from B. ciliaris, alkaloids from B. sindica, phenolic acid derivatives and phytosterols, and derivatives of hydroxamic acids from B. edulis, resulting in diverse biological properties such as antimicrobial, anti-inflammatory, and anti-cancer effects.

Flavonoids

Leaf extract of B. maderaspatensis is rich in phytoconstituents like saponins, mucilage, and flavonoids including caffeic acid, rutin, quercetin, and ferulic acid. From B. ciliaris, novel flavonol glycosides have been isolated. Isolation of phytochemicals showed a variety of compounds including phenolic acids, sterols, and glycosides such as blepharisides A and quercetin 3-O-rutinoside. Other flavonoids identified from B. ciliaris include apigenin 7-O-glucoside and apigenin-7-O-(3″-acetyl-6″-E-p-coumaroyl)glucoside.

Alkaloids and Hydroxamic Acid Derivatives

The bitter glucoside blepharin was first isolated from B. edulis. Blepharigenin (N-deoxy-DIBOA) and blepharin were also reported from B. scindica. These benzoxazinoid derivatives represent a distinctive class of secondary metabolites within the genus. Benzoxazine glucoside, benzoxazolone, and blepharin have been identified according to phytochemical study.

Phenolic Acids and Sterols

The phytochemicals reported from the Acanthaceae family are mainly flavonoids, alkaloids, lignans, benzonoids, fatty acids, terpenoids, tannins, and a few triterpenoid saponins. From B. linariifolia, a study conducted at Kumamoto University isolated four phenolic compounds for the first time: verbascoside, vanillic acid, apigenin, and 6″-O-p-coumaroylprunin were reported from the acetone extract of the aerial parts of B. linariifolia for the first time.

GC-MS profiling of B. ciliaris methanolic extract revealed a range of fatty acids and esters: 17 organic compounds were identified, including pentadecanoic acid ethyl methyl ester (2.63%), hexadecanoic acid methyl ester (1.00%), 9,12-octadecadienoic acid (Z,Z)-methyl ester (2.74%), 9-octadecenoic acid methyl ester (E) (2.78%), and octadecanoic acid (5.88%).

Phytosterol β-sitosterol-3-O-β-glucopyranoside and phenolics have been identified in B. maderaspatensis extracts, contributing to their bioactivity. A novel acid, 9-hydroxydodecanoic acid, was also reported from a Blepharis species.

Mineral Elements

Different extracts of Blepharis species contain carbohydrates, proteins, alkaloids, phenols, saponins, and steroids prominently. Calcium, zinc, potassium, and iron have also been detected.

4. Established and Proposed Mechanisms of Action

The biological activities of Blepharis extracts have been partially linked to their chemical constituents, though definitive mechanism-of-action studies remain limited. The presence of phenolic compounds and glycosides is considered responsible for the majority of the pharmacological actions.

• Anti-inflammatory mechanisms: It has been demonstrated that the ethanol extract of B. maderaspatensis possesses anti-inflammatory and anti-nociceptive properties, supporting the ethnopharmacological use of the plant in the treatment of inflammation. The flavonoid and phenolic content are considered key contributors.
• Antioxidant mechanisms: Extracts exert free radical scavenging activity, partly mediated through phenolics. All four phenolic compounds isolated from B. linariifolia showed free radical scavenging properties, with verbascoside being among the most potent.
• Gastroprotective mechanisms: β-sitosterol-3-O-β-glucopyranoside and phenolics in B. maderaspatensis extracts are associated with antioxidant and antisecretory gastroprotective activity.
• Enzyme inhibitory mechanisms: Apigenin showed the most potent inhibitory activity against α-glucosidase and tyrosinase (IC₅₀ = 34.73 ± 1.78 μM and 23.14 ± 1.83 μM, respectively), whereas 6″-O-p-coumaroylprunin showed potent inhibition for lipase (IC₅₀ = 2.25 ± 0.17 μM).
• Wound healing mechanisms: The presence of tannins, saponins, steroids, terpenoids, and flavonoids in the extract is associated with wound healing activity, supported by histopathological evaluation of incision and excision wound models.
• Neuroprotective mechanisms: Ethanol extract of B. maderaspatensis showed dose-dependent neuroprotective activity with significant decreases in time latency in the Morris water maze and increases in locomotor activity. Biochemical parameters showed significant decreases in lipid peroxidation and acetylcholinesterase levels, and increases in superoxide dismutase, catalase, glutathione, and total thiols.

5. Scientific Evidence by Area of Use

Important note on evidence strength: Most pharmacological studies have been performed mainly for B. maderaspatensis and B. ciliaris, along with few studies for B. linariifolia and B. scindica. Most of these pharmacological studies were performed using in vitro systems, with very few in vivo animal models. As of the date of this article, no published randomized controlled trials (RCTs) in humans have been identified for any species of Blepharis. All clinical claims therefore rest on traditional use, in vitro evidence, and animal (preclinical) studies, which represent preliminary evidence only.

5.1 Anti-Inflammatory and Analgesic Activity

Many studies have reported the anti-inflammatory properties of Blepharis using different models. For B. maderaspatensis, in vivo anti-inflammatory activity has been assessed using standard rodent models. The in vivo anti-inflammatory activity of different extracts and fractions of B. ciliaris has also been investigated.

Evidence type: In vitro and animal models only. No human trials. Numerous pharmacological actions have been shown in several species of the Blepharis genus, including anti-inflammatory and analgesic effects, wound-healing properties, gastroprotective abilities, as well as antioxidant, antibacterial, and anticancer activities.

5.2 Wound Healing

Rajasekaran et al. (2012) investigated the in vivo wound healing property for Blepharis maderaspatensis. The results of histopathological evaluation supported the outcome of both incision and excision wound models, and the presence of tannins, saponins, steroids, terpenoids, and flavonoids in the extract was noted.

Evidence type: Animal models only. No human trials.

5.3 Antioxidant Activity

Multiple studies across species have documented antioxidant potential. The ethanol extract of B. maderaspatensis (EBM) possessed good antioxidant properties, with IC₅₀ values of 37.4 and 44.1 µg/mL in DPPH and NO scavenging assays, respectively.

For B. ciliaris from the Hail Mountains of Saudi Arabia, the DPPH test evaluated antioxidant activity, revealing a notable increase with higher concentrations of the methanolic extract, achieving maximum inhibition of 81.54% at 1000 µg/mL.

In B. edulis, high amounts of phenolic and flavonoid contents were observed, with 34.85 ± 2.1 mg/g and 59.56 ± 0.29 mg/g respectively, supporting its medicinal uses.

All four phenolic compounds isolated from B. linariifolia showed good DPPH free radical scavenging activities, with verbascoside being the most potent.

Evidence type: In vitro only. Strength: preliminary.

5.4 Antimicrobial Activity

The methanolic extract of B. ciliaris exhibited moderate antibacterial activity, with average inhibition zones of 10.33 ± 1.53 mm, 13.33 ± 1.53 mm, 10.67 ± 1.53 mm, and 10.00 ± 2.00 mm against Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Serratia marcescens, respectively, as determined by the disk diffusion method. The minimum inhibitory concentration (MIC) values were 500 µg/mL for S. aureus and B. subtilis, whereas E. coli and S. marcescens showed susceptibility at 1000 µg/mL.

A study explored the bactericidal potential of different leaf extracts of Blepharis maderaspatensis and Ziziphus oenoplia against multidrug-resistant bacterial strains enumerated from pus specimens at secondary care medical centres in the Namakkal region.

For B. edulis, antimicrobial activity showed that yeasts and fungi were among the sensitive microorganisms to the extracts.

Evidence type: In vitro only. Strength: preliminary.

5.5 Gastroprotective and Anti-Ulcer Activity

A published study assessed B. maderaspatensis for gastroprotective properties in animal models. B. maderaspatensis (BM) is used in folk medicine for various stomach disorders. The chloroform and ethanol extracts of the plant were evaluated for antioxidant, gastric antisecretory, and gastroprotective properties. The gastric antisecretory properties of the extracts were assessed, at a dose of 100 and 200 mg/kg, using aspirin-pylorus ligation induced gastric ulcer models, and the gastroprotective activity was assessed at a dose of 100 and 200 mg/kg using HCl-ethanol induced ulcer models in rats.

The conclusion of this study was that the ethanol extract of BM possessed significant antioxidant property while the ethanol extract of the comparator plant Ammannia baccifera possessed good antisecretory and gastroprotective activity.

Evidence type: In vivo animal model. Strength: preliminary; no human trials.

5.6 Antihyperlipidemic and Anti-Atherogenic Activity

Chloroform, ethyl acetate, and ethanol extracts of the whole plant of Blepharis maderaspatensis were evaluated for their anti-hyperlipidaemic and anti-atherogenic activities. Rajasekaran et al. (2013) evaluated the antihyperlipidemic activities of the whole plant of B. maderaspatensis, with outcomes including reduction of VLDL, AI, and CRI as comparable with the standard drug Simvastatin. Ethanolic extracts show significant antihyperlipidemic effects comparable to Simvastatin in these studies.

Evidence type: In vivo animal model only. Strength: preliminary; no human trials.

5.7 Antidiabetic and Enzyme Inhibitory Activity

El-Shanawany et al. (2014) reported the in vivo glucose-lowering effect of the aerial parts of Blepharis species in hyperglycemic animal models. Dirar et al. (2019b) reported the in vitro α-glucosidase inhibitory activity of Blepharis species.

Specifically for B. linariifolia, apigenin showed the most potent inhibitory activity against α-glucosidase and tyrosinase (IC₅₀ = 34.73 ± 1.78 μM and 23.14 ± 1.83 μM, respectively), whereas 6″-O-p-coumaroylprunin showed potent inhibition for lipase (IC₅₀ = 2.25 ± 0.17 μM).

Evidence type: In vitro enzyme inhibition and in vivo animal models. Strength: preliminary; no human trials.

5.8 Neuroprotective Activity

A preclinical study evaluated the neuroprotective effect of Blepharis maderaspatensis against a colchicine-induced Alzheimer's disease rat model. Animals in the test group were administered ethanol extract of B. maderaspatensis at doses of 200, 400, and 600 mg/kg for 28 days. Ethanol extract of B. maderaspatensis showed a dose-dependent neuroprotective activity, with a significant decrease in time latency of the Morris water maze (p < 0.001) and increase in locomotor activity (p < 0.001) in the test group compared to the control group. Biochemical parameters showed a significant decrease in lipid peroxidation (p < 0.001) and acetylcholinesterase level (p < 0.001), and an increase in superoxide dismutase, catalase, glutathione, and total thiols (all p < 0.001).

Evidence type: In vivo animal model only. Strength: very preliminary; no human trials.

5.9 Anticancer / Cytotoxic Activity

Traditionally, Blepharis maderaspatensis has been assigned antioxidant, anti-inflammatory, antimicrobial, and wound healing properties. A study was aimed to assess dose and time-dependent cytotoxic potential of B. maderaspatensis. In vitro cytotoxic activity of ethanolic extract was assessed by MTT assay on MCF7, PA1, HT29, A375, and HepG2 cancer cell lines. All cell lines were treated with increasing concentrations of the extract for 24, 48, and 72 hours, or with a standard anticancer drug; IC₅₀ value was calculated for each duration. The ethanolic extract was an effective cytotoxic agent against all the tested cancer cell lines in a dose- and time-dependent manner. Research also highlights potential for B. maderaspatensis in developing eco-friendly anticancer therapies using silver nanoparticles.

Evidence type: In vitro cell line assays only. Strength: very preliminary; these findings are strictly exploratory and do not constitute evidence of anticancer efficacy in humans.

5.10 Antiplatelet Activity

The anti-platelet activity of B. edulis aqueous ethanolic extract has been reported on human platelets. This study represents one of the very few instances where a Blepharis extract was tested using human-derived material, though it remains an ex vivo laboratory assay and not a clinical trial.

Evidence type: Ex vivo, human platelet model. Strength: preliminary.

5.11 Urological Uses (Diuretic and Kidney Stone)

The water extract of the fruits of Blepharis is used in tradition for urinary disorders and kidney stones. These uses have a strong ethnobotanical basis across multiple traditions, but controlled scientific evidence in humans has not been identified in the peer-reviewed literature available at the time of writing.

6. Body Systems and Health Areas Associated with Blepharis

• Musculoskeletal / Pain: Anti-inflammatory and antinociceptive use; traditional treatment of bone fractures and swelling.
• Integumentary / Wound Healing: Topical use for cuts, wounds, ulcers, and skin diseases; in vitro and in vivo (animal) wound healing studies.
• Gastrointestinal: Traditional use for stomach pain, bilharzia, ulcers; in vitro and animal gastroprotective studies.
• Urological / Renal: Traditional diuretic use; folkloric use for kidney stones and urinary calculi.
• Cardiovascular / Metabolic: Antihyperlipidemic and anti-atherogenic activity in animal models.
• Endocrine / Metabolic: α-glucosidase inhibitory activity and glucose-lowering effects in animal models; potential relevance to blood sugar management.
• Neurological: Traditional use for diseases of the nervous system and headache; preclinical neuroprotective studies in rodent Alzheimer's models.
• Respiratory: Traditional oral infusion use for coughs and asthma.
• Ophthalmic: B. ciliaris used traditionally as an ocular treatment.
• Reproductive / Aphrodisiac: B. edulis and B. sindica used traditionally as aphrodisiacs; an investigation of aphrodisiac potential of B. edulis was published in reference to tribal claims in the Malwa region of Madhya Pradesh.
• Antimicrobial / Anti-infective: In vitro antibacterial and antifungal activity documented across multiple species.
• Oncology (Exploratory): In vitro cytotoxic activity against multiple cancer cell lines.

7. Dosages Reported in Studies

The following dosages are reported strictly as they appear in the cited scientific literature and are not recommendations:

• Gastroprotective/antisecretory assessment used doses of 100 and 200 mg/kg body weight of extract in rat models, both for aspirin-pylorus ligation models and HCl-ethanol induced ulcer models.
• Neuroprotective investigation in a colchicine-induced Alzheimer's rat model used ethanol extract of B. maderaspatensis at doses of 200, 400, and 600 mg/kg for 28 days.
• Antioxidant DPPH assay of B. ciliaris methanolic extract achieved maximum inhibition of 81.54% at 1000 µg/mL.
• Antibacterial MIC values for B. ciliaris methanolic extract were 500 µg/mL for S. aureus and B. subtilis, and 1000 µg/mL for E. coli and S. marcescens.
• In antioxidant assays of B. maderaspatensis, IC₅₀ values of 37.4 and 44.1 µg/mL were found in DPPH and NO scavenging assays, respectively, across a concentration range of 25–250 µg/mL.
• Enzyme inhibitory IC₅₀ values for apigenin isolated from B. linariifolia were 34.73 ± 1.78 μM against α-glucosidase and 23.14 ± 1.83 μM against tyrosinase; 6″-O-p-coumaroylprunin showed an IC₅₀ of 2.25 ± 0.17 μM for pancreatic lipase.

No standardized human dosage has been established in the peer-reviewed literature for any Blepharis species supplement. Traditional Ayurvedic preparations use decoctions of aerial parts and seeds, but specific quantitative dosage guidance has not been validated in controlled human studies.

8. Safety Considerations

The concern about the safety of medicinal plants has become a global approach pertaining to the notable increase in the consumption of medicinal plants. Published safety data on Blepharis species is sparse.

• Acute toxicity — B. maderaspatensis: Most pharmacological studies were performed using in vitro systems, with very few in vivo studies. Rajasekaran et al. (2012b) performed an acute toxicity study for B. maderaspatensis ethanolic and chloroform extracts to ascertain the safe dose by an acute oral toxic class method. Specific LD₅₀ or no-observed-adverse-effect level (NOAEL) values from these studies are not fully disclosed in the abstract literature available.
• Absence of chronic safety data: Various species of Blepharis have been found to be used in traditional medicine in African and Asian countries. Few of these species were studied for their bioactive chemical constituents; however, activity-guided isolation studies have not been performed. Similarly, detailed pharmacological studies in animal models to explore their mechanism of action have also not been reported. Future studies should focus on these aspects.
• Mosquito larvicidal potential: Whole plant extracts of B. maderaspatensis have been evaluated for mosquito larvicidal activity, suggesting a degree of biological potency that warrants attention to dosing.
• Traditional classifications: B. edulis was traditionally classified as a purgative and aphrodisiac, which suggests dose-dependent effects on gastrointestinal and reproductive systems even within traditional contexts.
• Interaction potential: Given the documented antihyperlipidemic effects (comparable to Simvastatin in animal models) and α-glucosidase inhibitory properties, theoretical pharmacodynamic interactions with statin-class drugs and antidiabetic medications are plausible, though this has not been formally studied.
• No human clinical safety trials: Although B. maderaspatensis may be beneficial for health, there needs to be a thorough review of all the research conducted on its medicinal uses and pharmacological properties. No human safety trials, genotoxicity assays, or reproductive toxicity assessments have been published in the identified peer-reviewed literature.

9. Research Gaps and Overall Evidence Assessment

Various species of Blepharis have been found to be used in traditional medicine systems in African and Asian countries. Few of these species were studied for their bioactive chemical constituents; however, activity-guided isolation studies have not been performed. Similarly, detailed pharmacological studies in animal models to explore their mechanism of action have also not been reported. Future studies should focus on these aspects related to the medicinally used species of Blepharis.

The overall body of published evidence for the genus Blepharis as a dietary supplement or therapeutic agent can be characterized as follows: ethnobotanical documentation is extensive and spans multiple continents and traditional medicine systems; phytochemical characterization is ongoing and has confirmed the presence of biologically active compound classes; preclinical (in vitro and animal model) evidence supports several of the traditional claims; and human clinical evidence is entirely absent from the peer-reviewed literature identified. The gap between promising preclinical findings and validated clinical applications remains large, and the genus warrants prioritized investigation through well-designed human trials.

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