الفهرس 
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Abstract
This study was made to provide a detailed description for the floristic and ecological features of Solanum incanum that grows naturally in Mareotis coast as well as evaluating its economical potentialities. The present study aims at the following objectives: 1. Study the floristic features including: record of plant species associated with Solanum incanum as well as their life-span, life-forms and floristic categories in the study area of 40 stands. 2. Quantitative analysis for the vegetation of S. incanum and its associated species using multivariate analysis (TWINSPAN – CCA). 3. Investigation of the variations in the edaphic factors to determine the effective soil variables that control the abundance and distribution of the studied plant and its associates in the study area. 4. Evaluating the economic potentialities of Solanum incanum by studying: a. Primary constituents and mineral content. b. Secondary metabolites. c. Biological activities by investigating: i. Antioxidant activities by DPPH scavenging activity. ii. Antibacterial activities by cup plate method. iii. The allelopathic potentialities against two nuisance weeds, Echinochoa crusgalli and Rumex dentatus. The investigated plant and its associated plant species in the 40 surveyed stands in Mareotis coast included 70 plant species that belonged to 62 genera and related to 25 families. Asteraceae, Poaceae and Chenopodiaceae were the largest families that contributed together about 52.85% of the total number of recorded plant species in the study area. According to life-span, the recorded species included 44 annuals, 24 perennials and 2 biennial species. The life-form spectrum of the 70 recorded species included Therophytes (65.71%), followed by hemicryptophytes (14.28%), Chamaephytes (8.57%), Nanophanerophytes (7.14%), geophytes (2.85%) and Helophytes (1.42%). The chorotypes of the recorded species revealed that, Biregional elements were attained the highest contribution by 20 species, followed by Monotropical elements by 15 species, 14 species of the recorded were Cosmopolitan, Pluriregional elements by 12 species. Other floristic categories were poorly represented. The TWINSPAN classification applied on the basis of the importance values of the 70 recorded species in the 40 stands in the study area which led to the identification of seven groups or community types, labeled A, B, C, D, E, F and G at the 3rd level of classification. Each vegetation group had a dominant, co dominant and an indicator. The CCA-biplot results of the species and edaphic variables indicated that Soil factors especially sand and clay particles, organic carbon, calcium carbonates and pH were the most effective soil variables that showed significant correlations with the axes. The phytochemical analysis included primary and secondary constituents, minerals content which revealed that the plant arieal parts are good source for nutrients and bioactive compounds as well as Antibacterial and antioxidant activity. These findings may promote their importance and usage in plant-based foods/ feeds and folk medicine. The result of this study illustrated the allelopathic potential of the aqueous extract of Solanum incanum aerial parts against seed germination and seedling growth of nuisance weeds Echinochloa crusgalli and Rumex dentatus especially at high concentrations where the degree of inhibition was concentration dependant.