🌿 Rājajambū (Jamun / Syzygium cuminii (Linn.) Skeels)

Syn. Eugenia jambolana Lam.
Family: Myrtaceae
Common English Names: Black Plum, Java Plum, Indian Blackberry

1. Synonyms (नामानि / Nāmanī)

Sanskrit Synonyms:
राजजम्बू (Rājajambū) • फलेन्द्र (Phalendra) • नन्दी (Nandī) • महाफला (Mahāphalā) • सुरभिपत्रा (Surabhipatrā) • महाजम्बू (Mahājambū)

Etymological Meanings:

• राजजम्बूः — “राजा चासौ जम्बू च” — The king among Jamuns; produces large, sweet, and juicy fruits.
• फलेन्द्रः — “फलानां इन्द्रः” — The lord among fruits (most superior).
• नन्दी — Gives pleasure and delight (ānanda-dāyinī).
• महाफला — Bearing large fruits.
• सुरभिपत्रा — Having aromatic leaves.
• महाजम्बूः — The biggest among Jambu varieties.

2. Regional Names (प्रादेशिक नामानि / Prādeśika Nāmanī)

3. Botanical Description (वनस्पति-विवरणम् / Vanaspati Vivarṇam)

• Scientific Name: Syzygium cuminii (Linn.) Skeels
• Synonyms: Eugenia jambolana Lam.
• Family: Myrtaceae

Morphology:

• Habit: A large evergreen tree up to 30 meters in height, found throughout India up to 1800 m altitude.
• Bark: Brown, 2.5 cm thick, exfoliating in woody scales.
• Leaves: Opposite, elliptic-oblong to lanceolate (7.5–15 cm × 3.8–6.3 cm), gland-dotted and aromatic.
• Flowers: Small, greenish-white, fragrant, in terminal panicles.
• Fruits: Ellipsoid or oblong drupes (up to 2.5 cm long), black or deep purple when ripe, with pinkish or whitish pulp.
• Seeds: 1–2 per fruit, oblong and astringent.
• Varieties:
• Rai Jaman — large, sweet, purple fruits (superior variety)
• Katha Jaman — small, less sweet fruits (inferior type)

Distribution:
Native to the Indian subcontinent; grows abundantly in tropical regions of India, Nepal, Sri Lanka, and Southeast Asia.

4. Chemical Constituents (रासायनिक संघटकाः / Rāsāyanika Saṅghatakāḥ)

Phytochemical Groups Identified:

• Flavonoids: Kaempferol, Myricetin, Quercetin, Isoquercitrin, Isorhamnetin-3-O-rutinoside, Quercetin-3-D-galactoside
• Anthocyanins: Delphinidin-3-gentiobioside, Malvidin-3-laminaribioside, Petunidin-3-gentiobioside (responsible for dark color)
• Phenolic Compounds: Gallic acid, Ellagic acid, Caffeic acid, Ferulic acid, Corilagin
• Triterpenoids: Oleanolic acid, Betulinic acid, Maslinic acid, Friedelin
• Sugars and Acids: Glucose, Fructose, Malic acid, Citric acid, Oxalic acid, Glycollic acid
• Others: β-Sitosterol, Myricyl alcohol, Eugenia triterpenoids A & B, Jamboline (glycoside responsible for anti-diabetic effect),
  1- and 3-galloyl glucose, Hexahydroxydiphenoyl glucose, Alkanes (C26–C34), and Limonene.

Antibacterial Constituents:
Leaf and flower extracts show inhibitory activity against E. coli and Staphylococcus aureus.

5. Properties and Therapeutic Uses (गुणाः तथा चिकित्सोपयोगाः / Guṇāḥ tathā Cikitsopayogāḥ)

Ayurvedic Pharmacological Properties

Therapeutic Applications

Classical References

• Mentioned in Caraka Saṃhitā – Chardinigrahaniya, Puriṣasaṅgrahaniya, and Mutrasaṅgrahaniya Mahākaṣāyas.
• In Suśruta Saṃhitā – Listed under Nyagrodhādi Gana.

Modern Pharmacological Effects

• Antidiabetic: Reduces blood glucose and glycosuria.
• Antioxidant & Anti-inflammatory: Due to high phenolic and anthocyanin content.
• Antibacterial: Effective against E. coli, Staphylococcus aureus.
• Gastroprotective: Useful in diarrhoea and dysentery.
• Cardioprotective & Hepatoprotective properties also reported.

6. Doses (मात्रा / Mātrā)

          Seed powder (Bīja Cūrṇa)
        1–3 g twice daily with water or honey

Summary Table

Ref: Bhavaprakash Nighantu