1.PHYSICAL CHARACTERIZATION OF COSTUS SPECIOSUS (KOENIG EX RETZ.) SMITH – A WELL KNOWN AYURVEDIC DRUG PLANT By P. Y. BHOGAONKAR_ V. D. DEVARKAR AND S. K. LANDE
Abstract
Ayurveda plays an important role in the life of people from India for health and longevity. The study of
plants used in the ayurvedic preparations always encourages undertaking new aspect of study. Costus
speciosus (Koenig ex Retz.) Smith, commonly known as ‘Keyu’ or ‘Kust’ is ayurvedic drug plant of repute
used to treat various ailments. It is also used in folk medicine in various parts of India. All plant parts are
used as medicine. Though an important medicinal plant, no anatomical data is available for drug
characterization. Drug characterization is important to understand purity of the drug. Here an attempt is
made to study the macro and micromorphology of all plant organs in details. Flowers are characterized by
presence of eye shaped nectaries on bracts and multicellular, yellow coloured juicy trichomes on petaloid
stamen; anatomically also several characteristic features are exhibited by plant which are unique to the
species. Stomatal index significantly vary at upper (5.58%) and lower epidermis (10.59%), respectively.
KEY WORD: Costus speciosus (Koenig ex Retz.) J. E. Smith, Macromorphology, micromorphology,
Plant anatomy.
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