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EnglishThe Public Green Space (PGS) in urban zones is a major interest in the sustainable development, both regarding environment and the quality of life of their users. The present study constitutes a first research which is interested in the PGS of the Urban district of Marrakesh (UDM) to have a basis of scientific data on these spaces and to help taking decision and environmental planning of it. It aims at (i) the study of the diversity of the ornamental flora (ii) and the analysis of the structure and the distribution of these PGS. So, the prospecting concerned 50 PGS distributed on 5 districts of the UDM. The results showed a diversity of ornamental flora which contains 297 vascular species, distributed in 212 genera and 88 families. 77 % of species are exotic. This specific richness is dominated by 12 families which contain 142 species distributed in 85 genera. The frequency, the origin and the biological type of these species are much diversified. The study of the structure highlighted 4 types of PGS that differ by their size and their function. The analysis of the floral affinity of the PGS-UDM revealed 13 groups which distinguish by their floral compositions. Consequently, the PGS-UDM contributes deeply to the preservation and the increase of the floral diversity and improvement of the esthetic quality of the city of Marrakesh. francaisEn milieu urbain, l’espace vert public (EVP) constitue un enjeu majeur du developpement durable, tant en matiere d’environnement que de qualite de vie de leurs usagers. La presente etude presente une premiere recherche sur les EVP de la ville de Marrakech permettant de disposer d’une base de donnees scientifiques sur ces EVP qui va aider a la prise de decision et de planification environnementale de la ville. Elle vise (i) l’etude de la diversite de la flore ornementale (ii) et l’analyse de la structure et la repartition spatiale de ces EVP. La prospection a concerne 50 EVP urbains repartis sur les 5 arrondissements de la ville. Les resultats ont montre une diversite de la flore ornementale qui s’eleve a 297 especes vasculaires, reparties en 212 genres et 88 familles et dont 77 % des especes sont exotiques. Cette richesse specifique est dominee par 12 familles qui detiennent 142 especes reparties en 85 genres. La frequence, l’origine et le type biologique des especes sont tres diversifies. L’etude de la structure a fait ressortir 4 types d’EVP qui different par leur taille et leur fonction. L’analyse de l’affinite floristique des EVP-CUM a fait apparaitre 13 groupes qui se distinguent par leurs compositions floristiques. En consequence, les EVP de la ville contribuent vivement a la conservation et l’accroissement de la diversite floristique et a l’amelioration de la qualite esthetique de la ville de Marrakech.

acta botanica malacitana

Biodiversité des espaces verts publics de la commune urbaine de Marrakech (CUM) (Maroc). Biodiversity of the public green spaces in the Urban District of Marrakesh (UDM) (Morocco)