Peltophorum pterocarpum (Fabaceae) Radhachura, Copperpod, Yellow Flame Tree

Das K
2 days ago
15 min read

Peltophorum pterocarpum, known as the Yellow Flame Tree or Radhachura, is a magnificent ornamental legume with profound medicinal significance across Southeast Asia. It is most notably recognized for its potent anti-inflammatory, antimicrobial, and analgesic properties, validated by cutting-edge network pharmacology studies targeting acne vulgaris. Recent research has identified two new sesquiterpenoids, peltopterins A and B, from its leaves, alongside a diverse arsenal of flavonoids, triterpenes, and steroids. Traditional healers value it for treating skin disorders, diarrhea, insomnia, muscular pain, and as a wound healing agent, while modern science is now elucidating its molecular mechanisms in conditions ranging from acne to inflammatory diseases.

1. Taxonomic Insights

Species: Peltophorum pterocarpum (DC.) Backer ex K.Heyne

Family: Fabaceae (Leguminosae)

Taxonomic Note: The genus name Peltophorum is derived from Greek, meaning "shield-bearing," referring to the shield-like shape of the stigma. The specific epithet pterocarpum means "winged fruit," describing the characteristic flat, winged pods. The plant is widely known by its synonyms Peltophorum ferrugineum and Caesalpinia ferruginea in older literature . Within the Fabaceae family, it belongs to the subfamily Caesalpinioideae, which is characterized by showy flowers and compound leaves.

The Fabaceae family is the third largest family of flowering plants, encompassing approximately 19,500 species. It is characterized by compound leaves, legume fruits, and a remarkable ability to form symbiotic relationships with nitrogen-fixing bacteria. The Caesalpinioideae subfamily, to which Peltophorum belongs, is medicinally significant for its diverse array of flavonoids, tannins, and alkaloids.

Related Herbs from the Same Family:

· Cassia fistula (Golden Shower Tree/Aragvadha): A widely used Ayurvedic laxative and purgative, valued for its gentle cleansing action and antimicrobial properties.

· Saraca asoca (Ashoka): The preeminent uterine tonic in Ayurveda, used for menstrual disorders and female reproductive health.

· Tamarindus indica (Tamarind/Imli): A versatile culinary and medicinal plant with laxative, antioxidant, and digestive properties.

· Butea monosperma (Palasha): Previously discussed, this tree shares similar anti-inflammatory and hepatoprotective properties with Peltophorum.

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2. Common Names

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3. Medicinal Uses

Primary Actions: Anti-inflammatory, Antimicrobial, Analgesic, Antioxidant, Astringent, Wound healing, Sedative (insomnia), Immunomodulatory.

Secondary Actions: Antidiarrheal, Antidysenteric, Antipyretic, Hepatoprotective, Hypoglycemic, Anticancer (cytotoxic), Aldose reductase inhibitory.

Medicinal Parts:

Different parts of the tree are used for specific therapeutic applications, each with distinct phytochemical profiles .

· Flowers: Used for insomnia, muscular pain, sprains, bruises, swelling, eye problems, and as a lotion for sores. The methanolic extract shows significant antibacterial activity against multiple pathogens .

· Leaves: Employed in decoctions for skin diseases, as a gargle, and in tooth powders. Rich in new sesquiterpenoids (peltopterins A and B) and flavonoids .

· Stem Bark: Used as an eye lotion, for muscle aches, abdominal colic, diarrhea, and as an antiseptic powder for wounds. Demonstrates analgesic and anti-inflammatory activity .

· Roots: Used for abdominal colic, joint and back pain, and ascites .

· Pods: Source of bioactive flavonoids and bergenin, used in traditional medicine.

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4. Phytochemicals Specific to the Plant and Their Action

Flavonoids and Related Compounds:

· Quercetin and derivatives (Quercetin 3-diglucoside, Quercetin 3-O-α-l-rhamnoside, Quercetin 3-O-β-d-glucoside, Quercetin 3-O-[α-l-rhamnopyranosyl(1→3)]-β-d-glucopyranoside): These exhibit Antioxidant, Anti-inflammatory, and Acne-targeting activities by inhibiting matrix metalloproteinases. Quercetin demonstrates high gastrointestinal absorption and bioavailability .

· Kaempferol derivatives (Kaempferol 3-O-α-l-rhamnoside, Kaempferol 3-O-β-d-glucoside, Kaempferol 3-rutinoside): Provide Antioxidant and Anti-inflammatory effects, also targeting inflammatory pathways relevant to acne .

· Rhamnetin: A flavonoid identified as a core compound targeting MMP1, MMP2, MMP9, and MMP13 in the relaxin signaling pathway for acne management .

· (+)-Leucocyanidin: Targets key acne-associated genes with high bioavailability .

· Hirsutidin: Another bioactive flavonoid active against acne targets .

· Bergenin: Isolated from pods, known for its Anti-inflammatory activity on rat paw edema .

· Catechol: Exhibits high gastrointestinal absorption and contributes to the plant's therapeutic profile .

· Flavonoid glycosides (seven additional compounds): Including kaempferol and quercetin glycosides with rutinoside, galactopyranoside, and arabinofuranoside linkages .

Sesquiterpenoids:

· Peltopterin A (new compound): A novel sesquiterpenoid isolated from leaves, characterized by an ester carbonyl group and hydroxy functionality. Its molecular formula is C11H18O3 .

· Peltopterin B (new compound): Another new sesquiterpenoid from leaves, discovered alongside peltopterin A .

· Additional sesquiterpenoids: Including (3S,5R,6R,7E,9S)-3,5,6,9-tetrahydroxy-7-megastigmene and (-)-boscialin .

Triterpenes and Steroids:

· Lupenone: A triterpene with documented Anti-inflammatory properties .

· Friedelin: A triterpene with potential Antimicrobial and Anti-inflammatory effects .

· Cycloartane derivatives (Cyclotirucanenone, Cycloeucalenol): Triterpenes with immunomodulatory potential .

· β-Sitosterol and Stigmasterol (and their derivatives): Steroids with Anti-inflammatory, Cholesterol-lowering, and Immunomodulatory activities. Present as mixtures in leaf extracts .

· Ergosterol derivatives (Ergosterol peroxide, 9,11-dehydroergosterol peroxide): Compounds with Antitumor and Antioxidant properties .

· 20-hydroxy-ecdysone: A steroid hormone with adaptogenic and anabolic potential .

Phenolic Compounds and Benzenoids:

· Gallic acid, Vanillic acid, Syringic acid, p-Hydroxybenzoic acid: Contribute Antioxidant and Astringent properties .

· Ferulic acid and Methyl ferulate: Potent Antioxidant and UV-protective compounds .

· Scopoletin and Scopolin: Coumarins with Anti-inflammatory and Antimicrobial activities .

· Lignans (Dihydrodehydrodiconiferyl alcohol and glucoside): Provide Antioxidant support .

Alkaloids and Other Compounds:

· 4(1H)-Quinolinone: An alkaloid with antimicrobial properties .

· Tannins: Identified in stem bark, providing Astringent, Wound-healing, and Antidiarrheal effects .

· Saponins and Steroids: Detected in phytochemical screening, contributing to Immunomodulatory and Anti-inflammatory actions .

· Xanthoproteins and Carboxylic acids: Additional secondary metabolites identified in flowers .

· Fatty Acids and Aliphatic Alcohols: Basic metabolic constituents .

Floral Volatiles:

The flowers emit complex volatile compounds including oxygenated sesquiterpenoids, diterpenes, and long-chain hydrocarbons, which function in pollination biology and have potential pest management applications .

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5. Traditional and Ethnobotanical Uses Covering the Medicinal Uses

Anidra (Insomnia) & Nidra Nasha (Sleep Disorders)

Formulation: Floral infusion or sachet.

Preparation & Use: The flowers are traditionally used to treat insomnia. A decoction of the flowers is consumed before bedtime, or dried flowers are placed in a sachet near the sleeping area. This use is documented across multiple traditional systems .

Reasoning: Traditionally attributed to its mild sedative properties, modern research has not fully elucidated the mechanism, but the presence of coumarins and flavonoids may contribute to CNS effects.

Tvak Rogas (Skin Diseases) & Yauvana Pidika (Acne Vulgaris)

Formulation: Leaf decoction for external wash; flower lotion.

Preparation & Use: Traditional healers use a decoction made from the leaves to treat various skin diseases. The flowers are used as a lotion for muscle aches, eye problems, and sores. For acne, the plant has been recently validated through network pharmacology as a multi-target therapeutic agent .

Reasoning: The plant's anti-inflammatory, antibacterial, and antioxidant qualities are well recognized. Recent 2024 research demonstrates that phytochemicals including quercetin, rhamnetin, hirsutidin, and (+)-leucocyanidin target key genes in the relaxin signaling pathway (EGFR, MMP1, MMP2, MMP9, MMP13), providing a molecular basis for its efficacy in acne management .

Atisara (Diarrhea) & Grahani (Malabsorption/IBS)

Formulation: Bark decoction or infusion.

Preparation & Use: The stem bark is used as a medication for diarrhea and to treat or reduce intestinal diseases. It is considered an astringent for gastrointestinal complaints .

Reasoning: The high tannin content provides astringent action, precipitating proteins in the intestinal mucosa to form a protective layer that reduces inflammation and fluid secretion. This validates its traditional use for diarrhea and dysentery.

Shoola (Pain) & Mamsa Shotha (Muscle Sprains, Bruises, Swelling)

Formulation: Flower lotion; bark infusion for topical application; decoction for muscle aches.

Preparation & Use: The flowers are used as a lotion for muscle aches, sprains, bruises, and swelling. The bark is used as an embrocation for sores and aches. A stem infusion is used for gargles and tooth powder for toothaches and gum pain .

Reasoning: Methanol and water extracts of the stem bark demonstrate significant analgesic and anti-inflammatory activity in rat models. The presence of flavonoids, triterpenes, and tannins collectively inhibits inflammatory mediators and pain pathways .

Mukha Roga (Stomatitis/ Mouth Sores) & Danta Roga (Dental Diseases)

Formulation: Stem infusion for gargles; tooth powder.

Preparation & Use: A stem infusion of P. pterocarpum is used for gargles and as a tooth powder. It is also described as an antiseptic powder for oral use .

Reasoning: The antimicrobial activity against oral pathogens and astringent properties of tannins reduce inflammation, tighten swollen gums, and cleanse the oral cavity.

Jwara (Fever) & Prameha (Diabetes)

Formulation: Leaf or flower extracts.

Preparation & Use: Various parts are traditionally used for fever and as a hypoglycemic agent .

Reasoning: The plant has documented antipyretic and aldose reductase inhibitory activities. The hypoglycemic potential has been reported in pharmacological studies .

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6. Healing Recipes, Decoctions, and Preparations

Anti-acne Floral Lotion

Purpose: Topical application for acne-prone skin.

Preparation & Use:

1. Collect fresh yellow flowers of Peltophorum pterocarpum.

2. Crush gently and soak in warm water for 15-20 minutes.

3. Strain and use the lotion to wash the face twice daily. This traditional application is now supported by network pharmacology research showing multi-target activity against acne genes .

Antidiarrheal Bark Decoction

Purpose: For acute diarrhea and intestinal discomfort.

Preparation & Use:

1. Take 5-10 grams of dried stem bark, crushed.

2. Simmer in 500 ml of water for 20-30 minutes until reduced to 250 ml.

3. Strain and drink 50-100 ml twice daily until symptoms subside. Discontinue if symptoms persist.

Wound Healing Topical Paste

Purpose: For cuts, sores, and skin infections.

Preparation & Use:

1. Crush fresh leaves into a smooth paste.

2. Apply directly to the affected area and cover with a clean cloth.

3. Change dressing daily. The antimicrobial and astringent properties promote healing and prevent infection.

Insomnia Soothing Tea

Purpose: To promote restful sleep.

Preparation & Use:

1. Take 5-10 dried flowers.

2. Steep in 1 cup of hot water for 10-15 minutes.

3. Strain and drink 30 minutes before bedtime.

Anti-inflammatory Pain Relief Poultice

Purpose: For muscle aches, sprains, and joint pain.

Preparation & Use:

1. Grind fresh flowers or leaves into a poultice.

2. Warm slightly and apply to the painful area.

3. Cover with cloth and leave for 1-2 hours. Repeat twice daily as needed. Traditional use validated by animal studies showing analgesic and anti-inflammatory activity .

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7. In-Depth Phytochemical Profile and Clinical Significance of Peltophorum pterocarpum (Radhachura)

Introduction

Peltophorum pterocarpum, the Yellow Flame Tree, is a striking example of how ornamental beauty can coexist with profound medicinal utility. Widely planted along roadsides and in gardens across the tropics for its spectacular yellow blooms, this Fabaceae member has quietly served as a source of traditional healing for generations. From treating insomnia and skin disorders in Southeast Asia to managing diarrhea and inflammation in India and Africa, its therapeutic applications are remarkably diverse. The 2019 discovery of two new sesquiterpenoids, peltopterins A and B, from its leaves signaled the beginning of a deeper scientific exploration . This was followed by a landmark 2024 network pharmacology study that, for the first time, elucidated the molecular mechanisms by which its phytochemicals target acne vulgaris through the relaxin signaling pathway . Concurrent research has confirmed its potent antibacterial activity against a wide panel of human pathogens, its analgesic and anti-inflammatory efficacy in animal models, and its rich phytochemical arsenal comprising over 54 known compounds . Peltophorum pterocarpum stands at the exciting intersection of traditional knowledge and 21st-century pharmaceutical science.

1. Flavonoids and Acne-Targeting Compounds (The Signature Bioactive Class)

Key Compounds: Quercetin, Rhamnetin, Hirsutidin, (+)-Leucocyanidin, Quercetin 3-diglucoside, Catechol; Kaempferol and Quercetin glycosides.

Pharmacokinetic Profile: All seven ADME-qualified phytochemicals from the plant exhibit high gastrointestinal absorption and favorable bioavailability scores, indicating good oral availability .

Actions and Clinical Relevance:

· Network Pharmacology-Based Acne Management (Landmark 2024 Discovery): A comprehensive 2024 study published in Cureus employed network pharmacology to investigate the multi-target therapeutic action of P. pterocarpum against acne vulgaris. The study identified 21 common targets between the plant and the disease. Through protein-protein interaction network analysis, five core target genes were identified as directly involved in the relaxin signaling pathway: epidermal growth factor receptor (EGFR), matrix metalloproteinase 1 (MMP1), MMP2, MMP9, and MMP13 . The phytochemicals responsible for targeting these key genes are quercetin, rhamnetin, hirsutidin, and (+)-leucocyanidin. MMPs are crucial in the inflammatory response and tissue remodeling in acne, while relaxin signaling modulates connective tissue integrity. By simultaneously targeting multiple nodes in this pathway, the plant offers a multi-targeted therapeutic approach superior to single-compound interventions.

· Antioxidant and Anti-inflammatory: Flavonoids are powerful antioxidants that protect cells from oxidative stress. Their ability to inhibit superoxide anion generation and elastase release, as demonstrated in in vitro assays at 10 μg/mL concentrations, contributes significantly to their anti-inflammatory effects .

· Bioavailability Advantages: The high gastrointestinal absorption of key flavonoids ensures that orally administered preparations can achieve therapeutic concentrations systemically, validating traditional internal use for systemic conditions.

2. New Sesquiterpenoids: Peltopterins A and B (The Novel Anti-inflammatory Leads)

Key Compounds: Peltopterin A (C11H18O3), Peltopterin B .

Discovery and Characterization: The 2019 study isolated and characterized two new sesquiterpenoids from the methanol extract of leaves. Their structures were established using advanced nuclear magnetic resonance (NMR) and high-resolution mass spectrometry. The discovery of these novel compounds, named after the genus Peltophorum, highlights the untapped chemical diversity of this plant .

Actions and Clinical Relevance:

· Superoxide Anion and Elastase Inhibition: The methanol extract and its fractions demonstrated significant inhibitory effects on superoxide anion generation (53.4% inhibition) and elastase release (112.3% enhancement/inhibition profile) at 10 μg/mL . Elastase is a key enzyme involved in tissue degradation and inflammation. Its inhibition is clinically relevant for inflammatory skin conditions, wound healing, and pulmonary diseases.

· Lead Compound Potential: The unique structures of peltopterins A and B represent new molecular entities, making them potential lead compounds for anti-inflammatory drug development. Their isolation from a previously understudied species opens avenues for synthetic modification and pharmacological optimization.

3. Antimicrobial and Antibacterial Arsenal

Key Compounds: Methanol extract of flowers and leaves; various flavonoids, tannins, and alkaloids.

Spectrum of Activity: The methanolic flower extract exhibits significant antibacterial activity against 7 out of 12 human pathogenic bacteria studied, including both gram-positive and gram-negative species . Effective against: Staphylococcus aureus, Bacillus cereus, Enterococcus faecalis, Streptococcus pyogenes (gram-positive); Proteus mirabilis, Acinetobacter baumannii, Serratia marcescens (gram-negative) .

Antifungal Activity: The methanol extract of P. pterocarpum exhibits the highest antifungal activity among tested ethnomedicinal plants against Candida albicans .

Actions and Clinical Relevance:

· Broad-Spectrum Antimicrobial Efficacy: The activity against both gram-positive and gram-negative pathogens, including the clinically challenging Acinetobacter baumannii, highlights its potential as a source of new antimicrobial agents in an era of rising antibiotic resistance.

· Skin and Wound Infection Relevance: The efficacy against S. aureus and Streptococcus pyogenes, common pathogens in skin and soft tissue infections, directly validates traditional topical applications for wounds, sores, and skin diseases.

· Mechanism: The antimicrobial activity is attributed to the combined action of flavonoids, tannins, and alkaloids, which can disrupt microbial cell membranes, inhibit enzymes, and interfere with metabolic processes.

4. Triterpenes, Steroids, and Anti-inflammatory Activity

Key Compounds: Lupenone, Friedelin, β-Sitosterol, Stigmasterol, Ergosterol peroxide, Bergenin .

Actions and Clinical Relevance:

· Analgesic and Anti-inflammatory (Validated In Vivo): Methanol and water extracts of the stem bark of P. pterocarpum demonstrate significant analgesic and anti-inflammatory activity when evaluated in standard rat models. This provides robust pharmacological validation for traditional uses in muscular pain, sprains, arthritis, and swelling . The activity is attributed to the synergistic action of triterpenes like lupenone and friedelin, alongside flavonoids and tannins.

· Bergenin's Contribution: Bergenin, isolated from the pods, has documented anti-inflammatory activity on rat paw edema, confirming its role in the plant's overall anti-inflammatory profile .

· Immunomodulatory Potential: β-Sitosterol and ergosterol derivatives are known for their ability to modulate immune responses, balancing inflammatory processes rather than simply suppressing them.

5. Phenolic Compounds and Astringent Activity

Key Compounds: Gallic acid, Vanillic acid, Tannins .

Actions and Clinical Relevance:

· Astringent and Antidiarrheal: Tannins provide the classic astringent action that forms the basis for the plant's traditional use in diarrhea and dysentery. They precipitate proteins in the intestinal mucosa, creating a protective barrier that reduces inflammation and fluid secretion.

· Antioxidant: The phenolic compounds collectively provide strong free radical scavenging capacity, protecting cells from oxidative damage and contributing to the plant's anti-aging and disease-preventive properties.

6. Floral Volatile Composition

Key Compounds: Oxygenated sesquiterpenoids, diterpenes, long-chain hydrocarbons, low molecular weight terpenoids .

Actions and Clinical Relevance:

· Pollination Biology: The volatile compounds emitted by the bright yellow flowers serve as complex chemical cues to attract pollinating bees, parasitoid wasps, and other Hymenoptera insects.

· Pest Management Potential: Understanding the floral volatile composition has implications for integrated pest management strategies in agriculture, as these compounds can influence the behavior of beneficial insects.

· Aromatherapy Potential: The diverse terpenoid profile suggests potential applications in aromatherapy for their calming or mood-modulating effects, though this remains to be explored.

An Integrated View of Healing in Peltophorum pterocarpum

· For Acne Vulgaris and Inflammatory Skin Conditions: Peltophorum pterocarpum offers a sophisticated, multi-targeted approach to acne management. The 2024 network pharmacology study elegantly demonstrates that its phytochemicals do not rely on a single mechanism but instead simultaneously modulate multiple key proteins in the relaxin signaling pathway, including EGFR and various MMPs. This system-level action addresses both the inflammatory component (via MMP inhibition) and the tissue remodeling aspects (via EGFR modulation) of acne pathogenesis. Complementing this targeted molecular action, the plant's broad-spectrum antibacterial activity directly suppresses Propionibacterium acnes and other skin pathogens, while its antioxidant flavonoids reduce oxidative stress. This convergence of molecular targeting, antimicrobial defense, and antioxidant protection makes it an exceptionally promising candidate for natural acne therapeutics.

· For Pain, Inflammation, and Musculoskeletal Conditions: The traditional use of flowers for sprains, bruises, and muscle aches is now supported by multiple lines of evidence. In vivo studies confirm significant analgesic and anti-inflammatory activity of stem bark extracts . The underlying mechanisms are multi-faceted: triterpenes like lupenone and friedelin inhibit key inflammatory enzymes; flavonoids reduce pro-inflammatory cytokine production; and tannins provide topical astringent and pain-relieving effects. This combination of systemic and local actions explains its effectiveness for both acute injuries (sprains, bruises) and chronic conditions (arthritis, muscle pain).

· For Gastrointestinal Health (Diarrhea and Dysentery): The plant provides a comprehensive solution for acute diarrheal diseases. The astringent tannins immediately reduce intestinal inflammation and fluid loss, providing symptomatic relief. The broad-spectrum antimicrobial activity targets bacterial pathogens (such as those confirmed in laboratory studies) responsible for infectious diarrhea. The anti-inflammatory flavonoids and triterpenes address underlying gut inflammation. This triple mechanism of astringency, antimicrobial action, and anti-inflammatory support validates its traditional use as a primary treatment for diarrhea and dysentery.

· For Wound Healing and Topical Infections: The application of leaf and flower preparations to wounds addresses all phases of healing. The antimicrobial activity prevents infection, while astringent tannins promote wound contraction. Anti-inflammatory compounds reduce swelling and pain, and antioxidant flavonoids support tissue regeneration. The documented activity against common wound pathogens like S. aureus and the antifungal effect against Candida albicans further supports this traditional application .

· As a Source of Novel Anti-inflammatory Leads: The discovery of two new sesquiterpenoids, peltopterins A and B, with significant superoxide anion and elastase inhibitory effects, positions P. pterocarpum as a source of novel chemical entities for drug development. Their unique structures offer scaffolds for medicinal chemistry optimization, potentially leading to new anti-inflammatory drugs with novel mechanisms of action .

Toxicological Profile and Safety Considerations

Peltophorum pterocarpum has a long history of traditional use, suggesting general safety when used appropriately as a topical agent or in moderate internal doses. The ADME analysis of its key phytochemicals indicates high gastrointestinal absorption and favorable bioavailability, which is beneficial for efficacy but also suggests that internal use should be respected .

Comprehensive toxicological data, particularly for long-term internal use, during pregnancy and lactation, and for potential drug interactions, are currently lacking. As with all potent medicinal plants, use under professional guidance is recommended, especially for internal administration. The plant should be used with caution in individuals with known allergies to legumes (Fabaceae family).

Conclusion: Peltophorum pterocarpum, the Yellow Flame Tree, is a botanical treasure whose medicinal potential is only now being fully illuminated by modern science. Its recent validation through network pharmacology for acne management, the discovery of novel anti-inflammatory sesquiterpenoids, and documented antimicrobial and analgesic activities place it at the forefront of medicinal plant research. The convergence of traditional ethnomedical knowledge with cutting-edge techniques like network pharmacology and advanced phytochemical isolation demonstrates how ancient wisdom can guide and accelerate modern drug discovery. From its vibrant yellow flowers that soothe insomnia and muscle pain, to its bark that checks diarrhea, to its leaves that heal wounds and target the molecular underpinnings of acne, Peltophorum pterocarpum embodies the holistic, multi-target approach that characterizes effective natural medicine. As research continues, this ornamental tree promises to illuminate new pathways for treating inflammatory, infectious, and dermatological conditions.

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Disclaimer:

Peltophorum pterocarpum is generally recognized as safe based on extensive traditional use. However, comprehensive safety data, particularly for concentrated extracts, long-term internal use, and use during pregnancy and lactation, are limited. Individuals with known allergies to Fabaceae (legume family) plants should exercise caution. Those on anticoagulant, antidiabetic, or immunosuppressive medications should consult a healthcare provider before therapeutic use, as bioactive compounds may interact with drug mechanisms. Topical use on open wounds should be with clean preparations. This information is for educational purposes only and is not a substitute for professional medical advice.

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8. Reference Books, Books for In-depth Study:

· Indian Medicinal Plants: An Illustrated Dictionary by C.P. Khare

· Medicinal Plants of South Asia by Muhammad Asif Hanif

· Phytochemistry of Medicinal Plants by John T. Arnason

· Wealth of India: Raw Materials (CSIR publication)

· Plants of the Coast of Coromandel by William Roxburgh (historical reference)

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9. Further Study: Plants That Might Interest You Due to Similar Medicinal Properties

1. Cassia fistula (Golden Shower Tree/Aragvadha)

· Species: Cassia fistula | Family: Fabaceae (Caesalpinioideae)

· Similarities: Both are yellow-flowering trees of the same subfamily, prized in traditional medicine. Cassia fistula is renowned for its potent laxative and purgative properties, while Peltophorum excels in anti-inflammatory, analgesic, and acne-targeting actions. They represent complementary therapeutic applications within the same botanical lineage.

2. Senna alata (Candle Bush)

· Species: Senna alata | Family: Fabaceae (Caesalpinioideae)

· Similarities: This yellow-flowering shrub is similarly prized for treating skin conditions, particularly fungal infections like ringworm. It shares with Peltophorum a rich profile of anthraquinones and flavonoids with antimicrobial and anti-inflammatory properties.

3. Butea monosperma (Palasha/Flame of the Forest)

· Species: Butea monosperma | Family: Fabaceae

· Similarities: Previously discussed, this tree shares with Peltophorum a similar stature, showy flowers (orange-red vs yellow), and overlapping traditional uses for skin diseases, inflammation, and gastrointestinal disorders. Both are rich in flavonoids and triterpenoids with potent anti-inflammatory activity.

4. Acacia catechu (Khair/Cutch Tree)

· Species: Senegalia catechu | Family: Fabaceae

· Similarities: This tree is renowned for its extremely high tannin content, used as an astringent, antidiarrheal, and for sore throats. It shares with Peltophorum the astringent applications and use in oral care (tooth powders, gargles) for gum diseases.

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Peltophorum pterocarpum (Fabaceae) Radhachura, Copperpod, Yellow Flame Tree

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