الفهرس 
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Abstract
This investingantion presents an ecophsiological study on two taxa namely; Lamium amplexicaule and Mentha longifolia belonging to family Labiatea. These plants attracted the attention due to their economic, medicinal and industrial uses. Also, they are common weeds growing in El Dakahlyia governorate.
The study includes 4 parts as follows:
Part 1, concerning the botanical aspects of the studied species to contribute more knowledge’s about their morphological characteristics, anatomical features and geographical distribution.
Part 2, gives a detailed description of several representative stands of their communities. For each type the analytical, synthetic and habitat characteristics are given.
Part 3, deals with the growth experimental analysis on Lamium amplexicaule and aiming to elucidate the periodical variation in the biomass, assimilating surface area and growth characteristics.
Part 4, comprises the essential oils analysis using GC-MS, determination of vitamins content and the primary metabolic constituents including: moisture, ash, total nitrogen, protein, crude fibers, total soluble sugars and total carbohydrates.