Several species of plant, including foxglove, holly, deadly nightshade, and laburnum, are poisonous. Nettles, hogweed, poison ivy, and primula cause skin reactions, including rash and itching, on contact. Young children are the most commonly affected. Symptoms of poisoning vary according to the plant but may include abdominal pain, vomiting, flushing, breathing difficulties, delirium, and coma and require urgent medical advice. Skin reactions can be treated by application of alcohol or calamine lotion; corticosteroid drugs may be prescribed for severe reactions. Poisoning usually requires gastric lavage. Fatal poisoning is rare. (See also mushroom poisoning.)
Tropical countries are a treasure house of a wide variety of medicinal plants. Some species are found wild, while a number of species have been domesticated by the farmers. Many species have been grown in homesteads and become part of traditional home remedies. A limited number of species are commercially cultivated though a few more have potential for large-scale production. The important tropical and subtropical medicinal plants are discussed here highlighting the importance, medicinal and other uses, distribution, botany, agrotechnology, chemical constituents and activity. For practical convenience of the discussion in this book, they are classified under the following four broad groups.a) Medicinal herbsb) Medicinal shrubsc) Medicinal climbersd)Medicinal trees... tropical medicinal plants
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