Pharmacognosy: Key Medicinal Plants and Their Constituents
Vinca
Synonyms: Catharanthus roseus, Madagascar Periwinkle.
Biological Source: Catharanthus roseus (Family: Apocynaceae).
Part Used: Dried whole plant, particularly leaves and roots.
Chemical Constituents:
- Dimeric Indole Alkaloids: Vinblastine (VBL) and Vincristine.
- Other Alkaloids: Ajmalicine, Serpentine, Lochnerine.
Uses: Chemotherapy for Hodgkin’s disease, lymphomas, childhood leukemia, neuroblastoma, and Wilms’ tumor.
Belladonna
Synonyms: Deadly Nightshade, Banewort.
Biological Source: Atropa belladonna Linn. (Family: Solanaceae).
Part Used: Dried leaves and flowering tops.
Chemical Constituents:
- Atropine: Primary active alkaloid.
- Hyoscyamine: Often present, converts to atropine.
- Scopolamine (Hyoscine): Contributes to anticholinergic effects.
Uses: Sedative, painkiller for neuralgia, gout, rheumatism, and as an antidote for poisoning.
Opium Poppy
Synonyms: Latex, Gum opium, Lachryma papaveris (“poppy tears”).
Biological Source: Air-dried milky latex from unripe capsules of Papaver somniferum Linn. (Family: Papaveraceae).
Chemical Constituents: Contains 25-35 alkaloids combined with meconic acid.
- Phenanthrene derivatives: Morphine, Codeine, Thebaine.
- Benzylisoquinoline derivatives: Noscapine, Papaverine, Narceine.
Uses: Sedative, hypnotic, antidiarrheal, antispasmodic, cough suppressant, and analgesic.
Senna
Synonyms: Cassia senna, Alexandrian Senna, Tinnevelly Senna.
Biological Source: Dried leaflets of Cassia senna L. and Cassia angustifolia Vahl.
Chemical Constituents: Sennosides A, B, C, D (anthraquinone glycosides), flavonoids, and mucilage.
Uses: Stimulant laxative for constipation, bowel cleansing, and treatment for hemorrhoids or IBS.
Aloe
Synonyms: Aloe barbadensis miller, Barbados Aloe, Burn Aloe.
Biological Source: Succulent perennial (Family: Liliaceae). Source: Dried leaf latex and mucilaginous gel.
Chemical Constituents: Polysaccharides (acemannan), anthraquinones (aloins), vitamins, enzymes, and minerals.
Uses: Wound healing, skin care, laxative, antioxidant, and anti-inflammatory.
Mentha (Mint)
Synonyms: Peppermint (M. piperita), Spearmint (M. spicata), Brandy Mint.
Biological Source: Genus Mentha (Family: Lamiaceae).
Chemical Constituents: Menthol, Menthone, Isomenthone, Menthyl acetate, and terpenoids.
Uses: Gastrointestinal relief, analgesic for headaches, oral health, and antimicrobial applications.
Clove
Synonyms: Caryophyllum, Clove buds, Lavang.
Biological Source: Dried flower buds of Syzygium aromaticum (Family: Myrtaceae).
Chemical Constituents: Volatile oil (eugenol), tannins, and resin.
Uses: Culinary spice, dental analgesic, antiseptic, and carminative.
Fennel
Synonyms: Fructus foeniculli, Sweet fennel, Wild fennel.
Biological Source: Dried ripe fruits of Foeniculum vulgare (Family: Apiaceae).
Chemical Constituents: Anethole, Fenchone, Limonene, and Estragole.
Uses: Digestive aid, appetite suppressant, galactagogue, and respiratory support.
Asafoetida
Synonyms: Hing, Devil’s dung, Food of the gods.
Biological Source: Dried gum resin from Ferula species.
Chemical Constituents: Resin (ferulic acid), volatile oil (sulfur compounds), and gum.
Uses: Digestive aid, expectorant for bronchitis, and nervine stimulant.
Myrrh
Synonyms: Gum Myrrh, Hirabol.
Biological Source: Oleo-gum-resin from Commiphora molmol (Family: Burseraceae).
Chemical Constituents: Volatile oil, resin, and gum.
Uses: Antiseptic, astringent for mouth ulcers, and traditional wound treatment.
Benzoin
Synonyms: Sumatra Benzoin, Lobani, Gum Benjamin.
Biological Source: Balsamic resin from Styrax benzoin (Family: Styraceae).
Chemical Constituents: Benzoic acid, cinnamic acid, and vanillin.
Uses: Antiseptic, expectorant, and adhesive for surgical tape.
Catechu
Synonyms: Black Catechu (Cutch), Pale Catechu (Gambir).
Biological Sources: Acacia catechu (Black) and Uncaria gambier (Pale).
Chemical Constituents: Catechins and Catechutannic acid.
Uses: Astringent for diarrhea, industrial dye, and tanning agent.
Pterocarpus
Synonyms: Indian Kino, Malabar Kino, Bijasal.
Biological Source: Dried juice from Pterocarpus marsupium.
Chemical Constituents: Kinotannic acid, flavonoids, and phenolics.
Uses: Anti-diabetic, treatment for diarrhea, and industrial tanning.
Digitalis
Synonyms: Foxglove, Purple Foxglove, Finger Flower.
Biological Source: Dried leaves of Digitalis purpurea or Digitalis lanata.
Chemical Constituents: Cardiac glycosides (Digitoxin, Digoxin).
Uses: Heart failure, arrhythmias, and diuretic effect.
Digoxin
Synonyms: Lanoxin, Digitalis glycoside.
Biological Source: Leaves of Digitalis lanata.
Chemical Constituents: Steroidal aglycone (digitoxigenin) with sugar chain.
Uses: Congestive heart failure and atrial fibrillation.
Artemisia
Synonyms: Sweet Wormwood (A. annua), Wormwood (A. absinthium).
Biological Source: Dried aerial parts of various Artemisia species.
Chemical Constituents: Artemisinin, volatile oils, and flavonoids.
Uses: Antimalarial, digestive aid, and antimicrobial.