الفهرس 
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Abstract
Introducing new and effective drugs against diseases derived from plants are widely believed as plant derived compounds are abundant and show ranges of bioactivity and diversity, enhancement of such compounds help in introducing new herbal and conventional drugs. Using allelopathic and salt stresses to enhance the phytochemical contents of medicinal plants as alternate route of genetic engineering and breeding projects may contribute to make use of stress response mechanism in enhancing biological active compounds in plants.
The family Asteraceae is one of the plant families which produce diverse classes of bioactive compounds including acetylenes and flavonoids which possess diverse biological activity. Bidenspilosa is one of the family Asteraceae species which produce diverse phytochemical classes of biological activity of which polyacetelens and flavonoids. The plant is collected from natural habitat. The status of the species and its variations in physiological performance in different habitats were studied in selected sites of geographically different areas of Sharqia Governorate. The surveys were conducted in two different growth stages (flowering and senescence) of the plant during 2009–2010. The frequency and density of the plant was higher in the moist habitats with higher organic carbon.