pharmacognosy phytochemistry practical medicinal plants volatile oils social pharmacy resins qc methods of natural drugs vein termination number vein islet number stomatal number stomatal index leaf constants biodiversity conservation intrinsic factors chemodemes hybridization polyploidy mutation ethylene abscissic acid cytokinins gibberellins auxins intrinsic factor plant growth regulators starch grains lycopodium spore method cultivation and collection extrinsic factors active constituents glycosides alkaloid fibres plant tissue culture
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