Moroccan flora is estimated at 7000 known species. Inferior plants (algae, mushrooms and moss) have been listed often and their geographic and biological characteristics are still fragmented. On the other hand, for the vascular flora, the inventory is relatively well established; it is estimated at 4.500 species, belonging to 940 genuses and 135 families, of which about 1/4 are endemic species! Vascular flora is well represented in the heart of forestral ecosystems where two thirds of the species come from; the remaining third is divided between steppic formations and humid biotopes. The mountanious regions of the Rif and Atlas are the most important sectors in the matter of endemicism.