Invasive Species Compendium

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Abstract

Characterization of the ornamental flora of the Dakar region (Senegal).

Abstract

This paper summarizes the results of a study conducted to characterize the ornamental flora in the Dakar area in Senegal. The study was carried out in 59 horticultural stations in the city of Dakar. In each site, the species present were identified and for each, fertile samples were collected, dried and preserved in herbarium form. This work made it possible to identify 109 ornamental species belonging to 81 genera gathered in 39 families. Among these species, 68 have already been mentioned in the flora of Senegal by other authors while the other 41 have not been listed and could be introduced into Senegal. This flora is dominated by angiosperms which represent 84.61% of families while pteridophytes are only represented by 2 families (Nephrolepidaceae and Polypodiaceae). Gymnosperms are represented by 4 families (Araucariaceae, Cupressaceae, Cycadaceae and Zamiaceae) which represent 10.26% of this ornamental flora. In angiosperms, the dicotyledonous class dominates with 64.10% of families. Biologically, phanerophytes are more represented with 53.21% of species, followed by nanophanerophytes and geophytes which respectively occupy 26.61% and 6.42% of species. Chaméphytes, therophytes and hemicrptophytes are poorly represented in this flora. Regarding the geographical distribution, the ornamental flora of Dakar is dominated by pantropical and American species which respectively occupy 33.94% and 12.84%, or about 46.78% of all the plants listed. African species only represent 5.5% of the ornamental flora. This study made it possible to characterize the ornamental flora of the city of Dakar. The structure of the flora as well as the taxonomic, biological and chorological spectra are determined. The results can be used to develop taxa identification tools (determination key).