الفهرس 
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Abstract
Phlomis aurea Decne. and Phlomis floccosa D. Don. exhibit different ecological and geographical distribution range in Egypt. Phlomis aurea is endemic to Saint Katherine Protectorate (SKP), South Sinai with narrow geographic distribution, but wide ecological range. Phlomis floccosa has wide geographical and ecological range within the coastal western Mediterranean coast of Egypt. Unlike P. floccosa, P. aurea has wide altitudinal range which increases its resistance to climate changes. Here, we assessed the effect of microhabitats on growth parameters and plant vigor of P. aurea and P. floccose, as well as their phytochemical constituents. The maximum EC of the soil in the various microhabitats supporting P. floccosa (950 μS/cm) is substantially higher than that of P. aurea (110 μS/cm). Both Phlomis species had low number of associated species which may be related to habitat aridity. The carbohydrate composition of plants varied according to the species, microhabitat and organ. Uronic acids constituted the major sugar fraction in the two species, with higher levels in P. aurea than P. floccosa and different organ allocation in the two species. Arabinose and xylose were the predominant monosaccharides in P. aurea, fructose and mannose were predominated in P. floccosa. Disaccharides of P. aurea were highest in flowers and least in leaves with the predominance of sucrose over maltose, but the reverse was true in P. floccosa. Stachyose was the only oligosaccharide detected, with contrasting distribution in the two species. The mean values of total nitrogen in the stem, leaves, and flowers of P. floccosa were greater than its values in P. aurea. However, free amino acids in P. aurea were found to be higher than their counterparts in P. floccose. Also, the soluble protein content was higher in P. aurea than them in P. floccosa.