Résumé.-Les graines de Retama monosperma sont affectées d'une inhibition tégumentaire qui empêche leur germination dans les conditions naturelles. Au laboratoire, cette germination est déclenchée après scarification chimique des graines par l'acide sulfurique pur, dans une gamme de températures se situant entre 10 °C et 30 °C. L'analyse en composantes principales des données relatives aux capacités de germination, aux coefficients de vélocité et aux temps de latence obtenus, après prétraitement à l'acide sulfurique pendant 4, 6 et 8 heures, aux différentes températures testées, montrent que l'optimum thermique de germination se situe entre 20 °C et 25 °C. En effet, à ces deux températures, nous avons enregistré les meilleurs coefficients de vélocité (23.25% à 31.81%), les capacités de germination (72% à 92%) et les temps de latence les plus courts (1 à 2 jours).Mots clés : germination -scarification chimique -Retama monosperma -inhibition tégumentaire.Abstract.-Seeds of Retama monosperma are affected by integumentary inhibition preventing their germination in the natural conditions. In the laboratory, the germination is triggered after chemical scarification of seeds by undiluted sulfuric acid, in a range of temperatures, between 10 °C and 30 °C. The principal component analysis of data relating to the capacity of germination, coefficients of velocity and latency time obtained after pretreatment with sulfuric acid for 4, 6 and 8 hours, tested at different temperatures, show that the optimum thermal germination is between 20 °C and 25 °C. Indeed, at these two temperatures, we recorded the best coefficients of velocity (23.25% to 31.81%), germination capacity (72% to 92%) and the shortest latency time (1 to 2 days).

Using 500 survey cards, the ethnobotanical survey was conducted over a period of 4 months. From the survey 62 species belonging to 30 families were identified. The family Lamiaceae is the most dominant followed by Apiaceae. In addition, the leaves are the most used part (38%). Furthermore, the infusion was the major mode of preparation (66%). In terms of diseases treated, digestive disorders rank first (50%), followed by respiratory diseases (28%). The results obtained will be a valuable source of information for the region. There could be a database for further research in the fields of pharmacology and for the purpose of evaluating the therapeutic efficacy of medicinal plants.

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In order to gather all the information concerning the nature and the therapeutic uses of the medicinal plants, an ethnobotanical study of the medicinal plants was realized Oran city's circle, between December 2017 and April 2018. This research was conducted in collaboration with different plant users such as ordinary users (500 people) who were randomly selected (340 women, 160 men).The survey targeted 500 people from the local population, including 423 people preferring medicinal plants with a rate of 84% and 77 people who received treatment in modern medicine with a rate of 16%. The results obtained from the population made it possible to identify 58 medicinal plants which are divided into 34 families, of which three are the most dominant, in particular Lamiaceae (29.55%), Apiaceae (17.96%) and Verbenaceae (14.65%). all listed plants with properties against allergy. the leaves are the most used organs (34%) and the majority of the remedies is prepared as an infusion (58%), the respiratory diseases occupy the first place with a rate of 42%. The results obtained constitute a very valuable source of information for the region studied and for the national medicinal flora. They could be a database for further research in the fields of photochemistry and pharmacology and for the purpose of searching for new natural substances.