The flora of Mecca city district, Saudi Arabia has been recently studied between March and July, 2014. Four hundred and thirty three (433) specimens were collected from the study area. The specimens were found to belong to forty four (44) families, one hundred twenty five (125) genera and one hundred and eighty four (184) species. In this work and for the first time, four new species (unidentified, possibly new) were collected with specimen’s numbers: 40, 175, 279 and 415. Besides, the study came out with nine rare species to the flora of Saudi Arabia: Tribulus arabicus Atriplex farinosa, Cyperus rotundus, Datura innoxia, Emex spinosus, Heliotropium crispum, Kohautia caespitosa, Launaea nudicaulis and Plantago ciliata. It was found that the largest family in Mecca is Poaceae represented by 17% followed by Fabaceae with a percentage of 13%. The most prevalent species was Calotropis procera. From the analysis of species, the most chorotype prevalent was Saharo-Arabian with 27.70%. In addition, the most life-forms prevalent is the Therophytes with 41%. On the other hand, most of the species of high percentage 24.57% are used for medicinal purpose.

 

Key words: Flora, mecca, Saudi Arabia.