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A Brazzaville, les dependances vertes jouent un role important sur le bien-etre et le cadre de vie des citadins. Cependant elles sont menacees de degradation a cause d’une urbanisation mal controlee. Cette etude a ete menee pour identifier et caracteriser la biodiversite vegetale de ces milieux. A cet effet, des releves floristiques ont ete realises au niveau de deux types de phytocenoses « degradee » et « semi intacte » dans deux sites des quartiers peripheriques de Ngamakosso et Sadelmi suivant un dispositif de 17 parcelles (30 m x 20 m). Au total, 205 especes vegetales reparties en 160 genres et 65 familles ont ete inventoriees. La presence/abondance de certaines especes et familles (Asteraceae, Rubiaceae, Poaceae) associee avec l’appreciable proportion des nanophanerophytes, revele le caractere arbustif et perturbe de cette vegetation sur des sols sableux et pauvres, favorables aux erosions. La conservation et la reconstitution des phytocenoses etudiees sont assurees grâce a des especes endemiques, guineo-congolaises et pantropicales, a tres large distribution. Les connaissances acquises de cette etude suggerent d’integrer la problematique de l’amenagement des espaces vegetalises urbains dans les politiques de developpement durable de la ville. Mots cles : Richesse floristique, biodiversite urbaine, phytocenose, conservation, reconstitution. English Title: Floristic diversity of peri-urban green dependencies in Brazzaville (Congo) threatened by degradation In Brazzaville, green dependencies have an important role in the well-being and living environment of city dwellers. However, they are threatened with degradation due to poorly controlled urbanization. This study was conducted to identify and characterize the plant biodiversity of these habitats. For this purpose, floristic surveys were carried out at the level of two kinds of "degraded" and "semi intact" phytocenosis at two sites in the outlying areas of Ngamakosso and Sadelmi following a scheme of 17 plots (30 m x 20 m). In total, 205 plant species distributed into 160 genera and 65 families were inventoried. The presence/abundance of certain species and families (Asteraceae, Rubiaceae, Poaceae) associated with the significant proportion of nanophanerophytes, revealed the shrubby and disturbed character of this vegetation on sandy, poor and erosive soils. The conservation and reconstitution of the studied phytocenosis are ensured by endemic, Guineo-Congolese and pantropical species, with very wide distribution. The knowledge acquired from this study suggests integrating the issue of vegetative landscaping into the city’s sustainable development policies. Keywords: Floristic richness, urban biodiversity, phytocenosis, conservation, reconstitution

Diversité floristique des dépendances vertes périurbaines de Brazzaville (Congo) menacées de dégradation