Résumé: La flore de la zone clé pour la biodiversité de la Zone Importante pour les Plantes en Algérie (ZIP), El Kala 1 (Nord-Est algérien) reste encore à ce jour très peu connue malgré ses données historiques, qui mettent en évidence son grand intérêt et son originalité sur le plan biogéographique, écologique et patrimonial. L'objectif de notre étude est de localiser les stations des taxons méconnus à l’échelle locale. Un total de 40 espèces et/ou sous-espèces sont nouvellement répertoriées dans cette région dont 30 spontanées et 10 xénophytes. En l’absence d’une protection légale de certaines de ces espèces, leurs biotopes continuent d'être dégradés voire détruits par les incendies, l’agriculture et le surpâturage. La maîtrise de ces évolutions par la sensibilisation des autorités et la réduction de la pression anthropique grâce à la sensibilisation du public doit faire l’objet d’une attention prioritaire en vue de la conservation de la flore patrimoniale en voie d’extinction.

Résumé: This in-depth floristic study, conducted from 2019 to 2023 in nine temporary wetlands in the Guelma and Souk Ahras provinces, northeastern Algeria, aims to highlight the natural heritage of the region by analyzing the floristic composition in relation to environmental conditions. To achieve this goal, comprehensive inventories were conducted, revealing the presence of 317 species belonging to 64 botanical families and distributed across 204 genera. The plant diversity at each site was assessed using various biological indices, with a particular focus on the Taxonomic Distinctiveness Index (TDI) to determine the influence of environmental factors such as fires, altitude, overgrazing and agropastoral activities on biodiversity. The results highlighted the dominance of therophytes (43.22%) and the prevalence of the Mediterranean assemblage (66.25%). Moreover, 8.83% of the species were endemic, 1.89% were protected by Algerian legislation and 1.26% were listed on the IUCN Red List. The study identified Priority Conservation Zones (PCA) where the preservation of ponds, particularly MTG, TRC, BTH, and GZE, is crucial. Additionally, floristic and ecological boundaries between ponds were identified, highlighting marked biological similarities between certain pairs and notable isolations, particularly evident in the case of BTH with a significantly high TDI. These results underscore the critical importance of the studied region, emphasizing the need to integrate its floristic biodiversity into conservation efforts to enhance overall ecological integrity. Keywords: phytoecology; temporary wetlands; Northeast Algeria; heritage taxa; Taxonomic Distinctiveness Index; threat; conservation

Résumé: Authenticity of honey presents significant challenges to food quality control, necessitating continuous modernization and enhancement of analytical methodologies. This study aimed to characterize 24 honey samples collected from eight regions in northeastern Algeria by analysing their physico-chemical parameters and pollen profiles. The results revealed significant pollen diversity across all samples, predominantly monofloral honeys, particularly eucalyptus honey, along with Hedysarum coronarium L., Arbutus unedo L., Lavandula stoechas L., Ziziphus lotus (L.) Lam. and Citrus sp. Multifloral honeys contained pollen from diverse taxa including Eucalyptus camaldulensis Dehnh., Hedysarum coronarium L., Echium plantagineum L., Lavandula stoechas L., Raphanus raphanistrum L. and Malva sylvestris L., common to northeastern Algeria’s ecosystems. Most honey samples met international physico-chemical standards, indicating high quality. However, honey quality is predominantly influenced by its botanical origin, as demonstrated by principal component analysis, cluster analysis and co-inertia analysis, which grouped the samples into seven distinct physico-chemical units. Precise characterization is essential for enhancing local honey production by elucidating the complex relationships between pollen composition, botanical origin and physico-chemical properties.

Résumé: Les auteurs rapportent la découverte récente en Algérie d'une nouvelle xénophyte de la famille des Onagraceae. La Jussie à grandes fleurs (Ludwigia grandiflora (Michx.) Greuter & Burdet), originaire de l'Amérique du Sud, a été observée pour la première fois au Nord-Est de l’Algérie (dans le complexe humide de Guerbès-Senhadja). Ce taxon est nouveau pour l’Algérie et aussi pour le continent africain.

Résumé: Ramalina farinacea is an epiphytic lichen-forming fungus with a broad geographic distribution, especially in the Northern Hemisphere. In the eighties of the last century, it was hypothesized that R. farinacea had originated in the Macaronesian–Mediterranean region, with the Canary Islands as its probable southernmost limit, and thereafter it would have increased its distribution area. In order to explore the phylogeography of this emblematic lichen, we analyzed 120 thalli of R. farinacea collected in 38 localities distributed in temperate and boreal Europe, the Western Mediterranean Basin, and several Macaronesian archipelagos in the Atlantic Ocean. Data from two nuclear markers(nrITS and uid70) of the mycobiont were obtained to calculate genetic diversity indices to infer the phylogenies and haplotype networks and to investigate population structure. In addition, dating analysis was conducted to provide a valuable hypothesis of the timing of the origin and diversification of R. farinacea and its close allies. Our results highlight that phylogenetic species circumscription in the “Ramalina farinacea group” is complex and suggests that incomplete lineage sorting is at the base of conflicting phylogenetic signals. The existence of a high number of haplotypes restricted to the Macaronesian region, together with the diversification of R. farinacea in the Pleistocene, suggests that this species and its closest relatives originated during relatively recent geological times and then expanded its range to higher latitudes. However, our data cannot rule out whether the species originated from the Macaronesian archipelagos exclusively or also from the Mediterranean Basin. In conclusion, the present work provides a valuable biogeographical hypothesis for disentangling the evolution of this epiphytic lichen in space and time.

Résumé: Bunium crassifolium Batt. (B. crassifolium) (Apiaceae) is an extremely rare endemic species from the North East of Algeria. In this study, we extracted the volatile organic compounds (VOC) of B. crassifolium Batt. aerial parts using an Agilent G1888 network headspace sampler coupled with an Agilent 7890 GC system. The results revealed the presence of twenty-two (22) compounds, twenty (20) of which were identified as representing 97.48% of the total composition, the major components are: 44.67% of β-Cubebene, 8.82% of β-Caryophyllene, 7.04% of γ-Elemene, 4.70% of δ-Cadinene, 4.11% of γ-Cadinene, 3.77% of Ascaridole and 3.33% of β-Elemene, along with other constituents at a relatively low amount.

Résumé: The aim of the present work is the scientific evaluation of an Algerian endemic taxa (Hypochaeris laevigata var. hipponensis Maire) widely used in folk medicine. For this objective, the active compounds, mineral element composition and antioxidant effects of three different extracts prepared from leaves were determined. Essays were started by a phytochemical screening, followed by mineral elements determination and leaf extract preparation using three organic solvents. The concentration of polyphenols, flavonoids, tannins, flavanols and orthodiphenols was determined in each extract as well as the radical scavenging activities and the total antioxidant properties. Correlation between bioactive compounds and antioxidant activities was also evaluated. Ethyl acetate extract showed the highest levels of polyphenols while the lowest one was found in raw extract, which contains the most important tannins. However, the lowest rate in anthocyanin was noted in butanol extract. Our data indicated that antioxidant properties varied according to extract type and radical scavenging used assay, indeed the half-maximal inhibitory concentration (IC50) value ranged between 0.71 ± 0.02 and 7.00 ± 0.62 mg/g extract. Several positive correlations between secondary metabolite contents and antioxidant activities were registered. The obtained results support the influence of solvent extracts on bioactive compounds. These phytochemical constituents as well as mineral elements provide substantial antioxidant activities and explain the effectiveness of the studied species as traditional remedy. Keywords: Hypochaeris laevigata var. hipponensis Maire, radical scavenging, Algerian species, bioactive compounds, solvent extraction

Résumé: Cette étude concerne les plantes vasculaires nouvellement signalées dans la région de Filfila (Nord-Est algérien). Au total vingt taxons indigènes et cinq xénophytes sont nouvellement décrits dans cette région. Ces nouvelles données chorologiques soulignent l'importance de la conservation de la région d’étude et de la préservation de la biodiversité globale de l’Algérie.

Résumé: Les auteurs rapportent la découverte récente d’une nouvelle population de Galium verrucosum subsp. halophilum (Ponzo) Lambinon sur la péninsule de l’Edough en Numidie orientale (nord – est de l’Algérie). Cette découverte renforce notre compréhension de l’aire de distribution de ce taxon.

Résumé: Calendula suffruticosa subsp. monardii (Boiss. & Reut.) Ohle, a medicinal plant from the Mediterranean region and, more precisely, from the extreme northeast of Algeria, is characterized by its wide use in the traditional medicine of the local population. This is what prompted us to investigate some pharmacological benefits such as anti-diabetes and Alzheimer's activities, in addition to anti- oxidant activity. The effects of extraction methods and solvents on the amount of phenolic profiles and the biological ac- tivity of the different parts of this plant were studied, where the aim was to obtain a high extraction yield of bioactive compounds and consequently high biological activities. Methods: In vitro standard procedures were used to assess enzyme inhibitory activity (AChE, BChE, α- Amylase and α-Glucosidase) of Calendula monadii, and the antioxidant activity was assessed using the DPPH, ABTS, CUPRAC, Reducing power and Ferrous ions assays. Results: When using ultrasound, a significant increase in the amounts of (TPC, TFC and TFlas) and an- tioxidant activity (DPPH, ABTS, CUPRAC, Reducing power and Ferrous ions cheating assay) in addi- tion to the inhibitory activity of enzymes (AChE, BChE, α-Amylase α-Glucosidase) was found, com- pared to the results of conventional extraction. Furthermore, the aqueous solvent of ethanol 70% is the very effective solvent for extraction compared to methanol 70% aqueous solvent. Conclusion: Based on these results, it can be said that this plant contains important biological activities, so it can be used in phytotherapy.

Résumé: An updated checklist of ferns and lycophytes of Algeria is presented, including taxonomy, distribution, conservation status, and notes. Overall, 61 taxa of ferns and lycophytes, from 27 genera and 16 families, are reported for Algeria, which counts for approximately 54% of the North African pteridophytes. There are also ten further uncertain taxa that need modern confirmation. The purpose of this work was to revise the checklist of all known pteridophytes present in Algeria and to provide a discussion on their taxonomy diversity, distribution pattern, rarity, conservation status, and national legal protection. Critical comments on most of the taxa are made.

Résumé: Two raised bogs, Aoural and Ain Salhat, located in the region of the little Kabylia (North East of Algeria), were reviewed in both floristic inventories and pollen analyses during six years (2016-2022). The floristic study has revealed the existence of 174 taxa, 119 for the Aoural pond and 109 for the Ain Salhat one. Analysis of surface sediments pollen from the two ponds allowed us to identify 52 pollen taxa. In Ain Salhat pond, tree taxa dominate this assemblage, reaching a rate of 47.4%, followed by herbaceous ones with 24.5%, shrubby taxa with 24.4% and finally undetermined taxa with 3.7%, this is due to the position of the pond which is situated in a wooded forest environment. On the other hand, in Aoural’s pond, herbaceous taxa dominate spectra with 37%, followed by trees ones which account for 36%, shrubs (23.4%) and finally undetermined taxa with at around 3.6%. The contribution of pollen analysis to the knowledge of the current flora of the two studied ponds is of 58%. In total, 186 species have been identified using these two methods, of which 12 species have only been observed in the pollen spectrum. Floristic study and pollen analysis are therefore two complementary methods of study. Key words: Eastern Kabylia (North-eastern Algeria), peaty ponds, surface pollen, indicator taxa.

Résumé: Une découverte d’une espèce ibéro-maghrébine, Scrophularia frutescens L., est mentionnée sur le cordon dunaire de la région de Guerbes-Filfila (Nord-Est algérien). Cette nouvelle observation permet de mieux cerner l’aire de distribution de ce taxon.

Résumé: Biodiversity and socio-ecological interest. — The present study was undertaken with the aim of improving knowledge and proposing a first checklist of horticultural plants present in public and private green spaces in the region of Annaba (northeastern Algeria). = During the period from 2018 to 2021, a total of 164 taxa recorded. The results obtained are given in terms of floristic composition, forms of life, type of nativity and socio-ecological interest of the plants observed. However, the real impact of potentially invasive species on plant communities and ecosystems deserves urgent assessment with specific studies.

Résumé: The identification of priority conservation areas (PCA) plays an important role in biodiversity conservation, but uncertainties create challenges for conservation planning. The objective was to test a method based on 'taxonomic distinctness' (TD) and to identify PCA to quantify the heritage value of a territory and establish the most appropriate conservation measures. The researchers performed a systematic and phytogeographical analysis of ten islands in northeastern Algeria, a biological hotspot with heterogeneous ecosystem types and subject to socio-economic pressures. The biological diversity represented by 223 species in these environments reflects a high rate of endemicity (13%). The floristic similarity between the islands is estimated at 89.9%. Additionally, four distinct plant groups have been identified by the canonical correspondence analysis (CCA). These groupings are linked to the edaphic characteristics and the degree of insularity. Keywords: Conservation, endemic, floristic similarity, island flora, Numidia, taxonomic distinction

Résumé: Calendula suffruticosa Vahl subsp. boissieri Lanza, is well known for its medicinal properties in northeastern Algeria. As far as literature has been able to prove, no study has attempted to make a phytochemical or biological activity evaluation (antioxidants, enzyme inhibitors and antimicrobial potential). This work intends to evaluate, for the first time, the chemical constituents and study the previously mentioned biological activities of C. suffruticosa.boissieri essential oil and different sections (flowers, leaves, roots) as well as the effect of changing the solvent (ethanol 70%) and (methanol 70%) on these activities. The essential oil of aerial parts of this plant was investigated using GC-MS, and 45 compounds were discovered, accounting for 98.01% of the essential oil, including 23 monoterpenes, 6 sesquiterpenes, 12 diterpenes, 1 coumarin, 3 alkanes, methyl-cyclohexane (23.73%), limonene (25.02%), and O-cymene (13.20%). Five methods were used to study the antioxidant activity (ABTS, DPPH, CUPRAC, reducing power, and β-carotene bleaching assay), where the results were impressive, especially for the essential oil. In addition, the hydroethanolic solvent (70%) was found to be the most effective solvent for extraction in general compared to the hydromethanolic solvent (70%). The extracts and essential oils of C. suffruticosa. boissieri also showed a strong inhibiting ability against cholinesterase, tyrosinase, anti-alpha-amylase, alpha-glucosidase, and antimicrobials, a very valuable antioxidant, which is a real discovery. Based on these results, it can be said that this plant has important biological activities, so it can be used in the phytotherapy, food, or pharmaceutical sectors.

Résumé: Amaryllis belladonna a new established xenophyte to Algerian flora is here reported for the first time from El Kala National Park (North-eastern of Algeria). This new report is the second record for North Africa.

Résumé: In this study, Seseli praecox of Algerian flora was investigated regarding their polyphenolic and flavonoids contents using the Folin–Ciocalteu and aluminum chloride colorimetric methods, respectively. TPC of crude aqueous ethanolic extract was 44mg± 0.09GAE/gDw, while, TFC have values of 1.53mg±0.01 QuercetinE/gDw and 6.93mg±0.01 RutinE/gDw for ethanolic extract, which mean that this plant is relatively poor source of polyphenols and flavonoids . In the other side, the polyphenolic extract of this plant was evaluated for its reducing power. The capacity of the extract to reduce the ferricferricyanide complex to the ferrous-ferricyanide complex mention that Seseli praecox showed a very high iron reducing power activity with Ec50=0.25mg/ml.

Résumé: Scarcity and endemism are considered the most important concepts of a region’s biodiversity and conservation. Nevertheless, our understanding of the models of scarcity and endemism is limited to high biodiversity regions as, for example, the wilaya of Souk Ahras, northeastern Algeria. In this study, we have compiled a list of all heritage species, their taxonomic composition, and geographic distribution. A total of 119 species was documented, and their distribution was as analyzed in the biological environments of two distinct phytogeographic sectors — C1 and H2. The rate of scarcity and endemism increased alongside the organic matter richness and, as a result, the forest and pre-forest area supported an over-representation of these species. The preservation of this biodiversity, exceptional and threatened, urgently requires appropriate scientific studies and environmental protection as short term measures.

Résumé: Bunium crassifolium Batt. is an extremely rare species growing in Algeria. Its leaf or aerial part is used for flavoring and garnishing food. The aim of the current study was to determine 37 bioactive phytochemicals and biological evaluation of the methanol and methanol:water (70:30) extracts of B. crassifolium for the first time. A total of 10 phenolic acids and 8 flavonoids have been identified in the extracts of the aerial parts by LC–MS/MS. Chlorogenic, gallic and ferulic acids were the most abundant phenolic acids detected, while rhoifolin, quercitrin and rutin were the most abundant flavonoids. In addition, 3 non-phenolic organic acids (fumaric acids, quinic and malic) were detected and among them quinic and malic acids were the most abundant. Antioxidant activity was evaluted by six methods and the extracts showed significant activity. The total phenolic and flavonoid contents were determined and methanol:water (70:30) extract showed higher values which entails its greater antioxidant capacity. In addition, anticholinesterase (AChE and BChE) activity was evaluated for both extracts using Ellman method. Methanol extract showed a better anti-acetylcholinesterase activity than methanol:water (70:30) one. While, both extracts showed a weak anti-butyrylcholinesterase activity. Furthermore, the anti-tyrosinase activity was tested and the methanol:water (70:30) extract was promising and more potent. In conclusion, B. crassifolium could be used in food industries and pharmaceutical as a potential functional food ingredient.

Résumé: This work highlights a plant of proven ecological and heritage importance. It is Leucojum aestivum subsp. pulchellum (Salisb.) Briq., a very rare and localized tyrrhenian endemic taxon from western Numidia (northeastern Algeria). Given its distribution and population characteristics and threats on the only observation locality in North Africa, the taxon deserves appropriate protection measures.

Résumé: This research aimed to assess the chemical composition of the essential oil (EO) of Thymus munbyanus subsp. coloratus cultivated in Annaba (Northeast Algeria) and to evaluate its potential insecticidal activity against newly molted pupae of Ephestia kuehniella Zeller (Lepidoptera: Pyralidae). The yields of EO calculated from the dry matter of the aerial part of the plant were estimated at 2.56 % (w / w). Its chemical composition has been analyzed using gas chromatography/mass spectroscopy (GC / MS). 54 Compounds were identified and the main components were carvacrol (39.11 %), para- cymene (15.47 %), and thymoquinone (10.59 %). In preliminary bioassays, various doses (5, 15, 25, 40, and 100 μl / mL) of the T. munbyanus EO were tested on newly molted pupae and the inhibition doses (ID) of adult emergence were determined. In a follow-up experiment, EO of T. munbyanus applied at its ID25 (15.38 μl / mL) and ID50 (25.22 μl / mL) was evaluated on acetylcholinesterase (AChE) and glutathion S-transferases (GSTs) activities. Biomarkers measurements in the treated pupae and adults (ID25 and ID50) revealed an inhibition in AChE activity and activation of the detoxification system as evidenced by induction in GSTs activities. Lastly, our results proved the potential use of this material as an alternative to synthetic insecticides for controlling stored product pests.

Résumé: Cet article est une nouvelle contribution concernant Erica numidica (Maire) Romo & Borat. dans l’extrême nord-est algérien. Ce taxon critique est mal évalué dans la littérature botanique. C’est pourquoi, son statut d’endémique restreinte de la Numidie orientale est discuté dans le présent travail. Compte tenu de l'effectif très réduit de sa population, désormais relictuelle, le taxon est proposé pour figurer parmi les taxons en danger critique d'extinction en Algérie.

Résumé: Hypochaeris laevigata var. hipponensis (Asteraceae) is an endemic plant from Algeria. In the current study, we analyzed for the first time its chemical composition, especially phenolic constituents of dichloromethane (DCM), ethyl acetate (EA), and n-butanol (BuOH) fractionsof the aerial parts of Hypochaeris laevigata var. hipponensis by liquid chromatography-mass spectrometry (LC-MS/MS). The number of phenolic compounds detected in DCM, EA, and BuOH fractions were found to be 9, 20, and 15, respectively. More specifically, 12 phenolic acids were detected. Among them, quinic acid, chlorogenic acid, and caffeic acid were the most abundant ones. Meanwhile, only seven flavonoids were detected. Among them, rutin, apigetrin, and isoquercitrin were the major ones. We also determined the total phenolic and flavonoid contents, and fraction EA showed the highest values, followed by BuOH, and DCM fractions. Furthermore, the antioxidant action was dictated by five methods and the tested plant fractions demonstrated a noteworthy antioxidant action.

Résumé: Les auteurs signalent une observation de Pteris vittata L. dans la Numidie algérienne. Cette découverte permet de faire le point sur sa répartition en Algérie. Mots clés: Pteris vittata, Algérie, nouvelle répartition, rare.

Résumé: On the occurrence of Atriplex canescens (Amaranthaceae) in Algeria: ecology, taxonomy and biogeography. – Atriplex canescens var. gigantea S. L. Welsh & Stutz is recorded for the first time for the non-native flora of Algeria. The description of the finding locality, taxonomic notes and detailed distribution are provided.

Résumé: The authors report the recent discovery in Algeria of a xenophyte belonging to the Asteraceae. Arctotheca calendula, native to South Africa, was observed for the first time, in the northeast of the country (Oriental Numidia).

Résumé: The present investigation reported the both phenolic quantification and biological activities of of the North African endemic halophyte Limonium spathulatum (Desf.) Kuntze. Extracts were prepared by maceration using three solvents (Methanol, Methanol:Water (5:1) Chloroform). Phenolic compounds were spectrophotometrically quantified with microplate method, while the biological activities were appreciated using the antioxidant activity, the inhibition of acetylcholinesterase (AChE), butyrylcholinesterase (BChE), α-glucosidase and the nitrite oxide (NO) inhibition. Polar extracts showed high level of total-phenolic contents and exhibited the strongest antioxidant potential. Moreover, Methanol: Water extract demonstrated the best inhibitory activity against AChE and BChE with IC50 values of 3.28±0.16μg/ml and 26.64±0.96μg/ml, respectively. Both Methanol: Water and Methanol extracts were found to be more efficient in the inhibition of α-glucosidase (IC50: 2.83±0.19 and 5.03±0,03μg/ml, respectively) than the positive control Acarbose who gave a high IC50 value (275.43±1.59μg/ml). Moreover, Methanol extract displayed the highest anti-inflammatory activity inhibiting NO release by 86.21% at 100 μg/ml in LPS-stimulated RAW 264 cells. The obtained results showed the multiple therapeutic actions of L. spathulatum which can be used as a potential and valuable source of bioactive coumpounds.

Résumé: Nous signalons dans ce travail la redécouverte d’un taxon, localisé exclusivement en Algérie orientale et subendémique tyrrhénien, appartenant à la famille des Cistaceae : Tuberaria acuminata (Viv.) Grosser. Nous présentons des photographies de cette plante sur le terrain et les premiers éléments concernant son aire de répartition en Algérie. La grande rareté de ce taxon au Maghreb et la régression historique des milieux où il subsiste, mettent en avant l’intérêt patrimonial et la grande valeur de deux stations où nous l’avons observé (péninsule de l’Edough et Filfila), en vue de la conservation de cette espèce.

Résumé: Stachys marrubiifolia Viv.Lamium flexuosum Ten.Antioxidant activitiesEndemicBiological bioactive compoundsSolvent extraction. Abbreviation: 22-diphenyl-picryl-hydrazyl (DPPH)Nitroblue tetrazolium (NBT)Ferric reducing antioxidant power (FRAP)Stachys marrubiifolia Viv. (S. Marrubiifolia)Lamium flexuosum Ten. (L. flexuosum)Atomic Absorption Spectrometry (AAS)Inductively coupled plasma-mass spectrometry (ICP-MS)Principal component analysis (PCA)

Résumé: La connaissance de la diversité de la flore mellifère algérienne est indispensable à l’identification des zones favorables à l’apiculture. Cette étude a évalué la diversité de la flore mellifère de la Numidie (Nord-Est algérien). Des observations directes et périodiques durant deux années, 2017 et 2018, de ruchers au niveau de 15 stations distribuées dans 5 wilayas, nous ont permis de recenser 192 espèces mellifères rattachés à 42 familles, surtout des Fabaceae, Asteraceae, Lamiaceae, Rosaceae et Apiaceae. Les espèces à forte valeur apicole (26) représentent 13,5 % de la richesse totale et sont plus fréquentes durant la saison pluvieuse. L’apport de l’analyse pollinique à la connaissance des plantes butinées par les abeilles est de 76%. Au total, 239 espèces ont été recensées grâce à ces deux méthodes, dont le ¼ (47 espèces) ont été révélées seulement par l’analyse du miel. L’analyse pollinique et l’observation directe de terrain sont donc deux méthodes d’étude qui se complètent.

Résumé: The wetlands of northeastern Algeria are rich in flora because of their biogeographical context. The Fetzara Lake, designated Ramsar site since 2002, has been the subject of multiple plant surveys conducted between 2014 and 2019 and has revealed the existence of 226 taxa belonging to 166 genera and 58 families with the dominance of therophytes (45.13%, 102 species). From the chorological point of view, the Mediterranean type was the most dominant with 128 taxa or 56.64% of the studied flora 19 of which are endemic to Algeria. Canonical analysis represented the superimposition of the three physiognomic environments of vegetation (dry lawns, amphibian meadows and semi-permanent lake) with respect to environmental variables. The results suggest that the distribution and variation of species abundance is mainly ordered according to salinity and grazing. These degradation factors therefore merit to be divulgated to arouse awareness of the public authorities and the population in order to implement appropriate protective measures.

Résumé: Les subéraies de la péninsule de l’Edough (Nord-Est algérien) subissent de nombreux dommages de la part de l’homme et de ses troupeaux. Leur stabilité est menacée à court terme dans toutes les stations étudiées. L’augmentation de nombre des cheptels ovin, caprin et bovin dont l’élevage extensif provoque des dégâts considérables au milieu naturel. En effet le surpâturage augmente le nombre des thérophytes sur le nombre des pérennes.

Résumé: Thirty stations at the El Kala National Park (North Eastern Algeria) were the subject of a floristic focused on the study of the ecology of bulbous and tuberous geophytes. The floristic analysis was used to draw up a checklist of 67 species belonging to 36 genera and 14 families, among of which 19 species a high proportion of rare and /or endemic taxa; among them six signed taxa are endemic to algerian-tunisian mainly represented by family of Orchidaceae. In this work, we recorded the presence of a new species for the Algerian flora which is Ophrys fusca subsp. lupercalis. Multivariate analyses revealed certain environmental variables determining the distribution of geophytes. The visited sites show an alarming vulnerability and subject to threats, particularly anthropogenic ones.

Résumé: Notre travail permet d’apporter une contribution à l’inventaire des Orchidées de la région de Fillaoucene (Nord-Ouest algérien) en prospectant une localité écologiquement très favorable à ces espèces. Il a révélé la présence de 22 taxons appartenant à six genres, dominés par les Ophrys (11 taxons) et les Anacamptis (six taxons). Le taux de rareté des orchidées recensées est remarquable 59%, ainsi trois taxons sont signalés rares et endémiques (Anacamptis morio subsp. tlemcenensis, Ophrys fusca subsp. maghrebiaca et Ophrys subfusca subsp. battandieri). La préservation de cette orchidoflore exceptionnelle et menacée à court terme nécessite la mise en place urgente d’études phytoécologiques et de mesures de protection appropriées.

Résumé: The aerial parts of Centaurea papposa, a species growing wild in Algeria and Tunisia, were investigated for the occurrence of sesquiterpene lactones. The germacranolide cnicin is the main compound. In addition one eudesmanolide, two elemanolides, one elemane derivative and the flavonoid eupatorin were isolated.

Résumé: Dans le but de connaître les plantes médicinales utilisées traditionnellement par la population des villages de la péninsule de l’Edough (nord-est algérien), une étude floristique et ethnobotanique a été réalisée dans cette région. L’étude de la flore médicinale a permis d’inventorier 80 espèces, appartenant à 41 familles et 77 genres. De même, nous avons collecté un certain nombre d’informations grâce à une série d’enquêtes ethnobotaniques réalisées à l’aide d’un questionnaire. Les résultats obtenus constituent à la fois une source d’informations très précieuse, pour la région étudiée et pour la flore médicinale nationale, et une base de données pour les recherches ultérieures dans les domaines de la phytochimie, la pharmacologie et sur les nouvelles substances naturelles.

Résumé: Discovery of Gamochaeta antillana (Asteraceae) in eastern Numidia (El Tarf-Algeria) — The new presence of Gamochaeta antillana (Urb.) Anderb. in Algeria is discussed. Its presence in Garâat Dakhla pond in eastern Numidia (North-East Algeria) is considered in perspective with the diversity and wetlands conservation.

Résumé: Cette étude rapporte des données sur la diversité des Ptéridophytes du Parc National d’El Kala (Nord-Est algérien). Treize stations à caractéristiques écologiques différentes ont été prospectées; 27 espèces on été identifiés, dont 7 sont rares. L’inventaire de ces taxons constitue une étape importante pour le développement des stratégies de conservation des ressources génétiques et de la diversité des fougères et lycophytes sur l’ensemble de leur aire de distribution naturelle. Le statut des espèces et les principales menaces pour les habitats sont discutés.

Résumé: This study was carried out with the aim of enriching the list of lichens of Algeria, for this reason we have prospected 2 stations “Les Cascades des Vautours” and “Dar smayer” at 442 and 856 m of altitude, Edough Peninsula on the North East Algerian coast. The annual precipitation is relatively abundant, of the order of 1000 mm. Seventythree taxa were registered belonging to 15 families of which 8 taxa: Cladonia cervicornis subsp. verticillata (Hoffm.) Ahti, C. ramulosa (With.) J.R. Laundon, C. humilis (With.) J.R. Laundon, Nephroma parile (Ach.) Ach., Parmelinopsis afrorevoluta (Krog & Swinscow) Elix & Hale, Ramalina siliquosa (Huds.) A.L. Sm., Usnea esperantiana P. Clerc and Xanthoparmelia conspersa (Ehrh. ex Ach.) Hale, which were never mentioned in Algerian lichen flora.

Résumé: Compte tenu de l’importance de réunir les connaissances sur la distribution et l’habitat des espèces végétales dans un but de conservation et de gestion, les auteurs essaient de fournir des informations à jour sur l’écologie et la répartition de seize taxons observés sur le littoral de la péninsule de l’Edough (Nord–Est algérien), dont huit sont méditerranéens (Anthemis maritima L. subsp. maritima, Anthyllis barba–jovis L., Echinophora spinosa L., Euphorbia dendroides L., Malva arborea (L.) Webb et Berthel., Matthiola incana (L.) R. Br., Romulea leichtliniana Halácsy et Teucrium fruticans L.), trois endémiques algéro–tunisiens (Centaurea papposa (Coss.) Greuter, Limonium gougetianum (Girard) O. Kuntze subsp. gougetianum, Sedum tuberosum Coss. et Letourn., Sixalix farinosa (Coss.) Greuter et Burdet), un subendémique tyrrhénien (Seseli praecox (Gamisans) Gamisans) et quatre endémiques algériens (Brassica fruticulosa subsp. numidica (Coss.) Maire, Limonium fradinianum (Pomel) Erben, Matthiola sinuata (L.) R. Br. var. numidica Coss. et Silene rosulata Soy.–Will. et Godr. subsp. rosulata).

Résumé: In Algeria, little research has focused on the use of spontaneous plant species in traditional medicine. Indeed, the majority of his work was based on surveys with users, neglecting the floristic aspect of the field. In this context, we carried out a floristic and ethnobotanical study with the residents of Guerbès-Sanhadja. In order to know the medicinal plants traditionally used by the population of the villages and hamlets of the wet complex of Guerbès-Sanhadja, a floristic and ethnobotanical study was carried out in this region. 150 people were interviewed consecutively between January and May 2015. Ethnobotanical data were collected and their habits in traditional medicine were detailed. The study of the medicinal flora made it possible to inventory 52 genera and 81 species belonging to 52 botanical families. Similarly, a series of ethnobotanical surveys carried out, using a questionnaire, made it possible to collect a certain amount of information. The results of this study showed that foliage is the most used part of the Aboriginal population. The majority of remedies are prepared as an infusion. Of all the diseases treated, digestive disorders represent the most cited diseases. The results obtained constitute a very valuable source of information for the region studied concerning the Algerian medicinal flora. This will undoubtedly constitute a database for further research in phytochemistry and pharmacology whose purpose is to discover new natural substances of plant origin.

Résumé: Des prospections botaniques ont été réalisées durant le printemps de l’année 2018 de manière occasionnelle sur le Djebel Taya (Guelma, Nord-Est algérien). Elles ont permis de découvrir de nouvelles répartitions dans le secteur C1 (sensu QUÉZEL & SANTA 1962-1963) de trois orchidées (Ophrys omegaifera subsp. hayekii, x Ophrys joannae et Orchis patens subsp. patens). Ainsi, de nouvelles stations, dans le Djebel Taya et ses environs ont été découvertes. Ces trois orchidées ont été observées pour la première fois dans ce territoire. Il s'agit (Ophrys numida, Ophrys atlantica subsp. atlantica et Dactylorhiza elata). Par ailleurs, 3 espèces et 1 hybride partagent le statut d’endémisme avec quelques pays de la Méditerranée, en l’occurrence la Tunisie et l'Italie. Cette région peu visitée par les orchidologues mérite d'être mieux explorée et mieux connue.

Résumé: Neuf zones humides de la région d’Annaba (Nord Est d’Algérie) ont fait l’objet d’inventaires floristiques durant trois années (2014–2016). Nous avons révélé la présence de cinq types de mares temporaires avec la dominance des mares à Ranunculus aquatilis L. La flore étudiée est riche et diversifié. Elle se compose de 190 espèces et 143 genres appartenant à 58 familles botaniques. Ces espèces sont, soit strictement inféodées aux zones humides, soit transgressives des milieux terrestres. Cette flore est caractérisée par une forte proportion des taxons rares et/ou menacés (11.05%). La composition du spectre biologique global montre la dominance des thérophytes, avec 99 taxons (52.11%). La majorité des espèces recensées relève de l’ensemble phytochronique méditerranéen. Dix-huit taxons appartiennent à l’ensemble endémique. La préservation de cette biodiversité exceptionnelle et menacée à court terme nécessite la mise en place urgente d’études phytoécologiques et de mesures de protection appropriées.

Résumé: L’orchidoflore de la Numidie de Philippeville au Nord-Est algérien de demeurent mal connue malgré l’importance de ce secteur clé comme hotspot de la région méditerranéenne. Un inventaire a été effectué durant la période de 2012-2016. Dix huit taxons ont été inventoriés, avec la prédominance du genre Ophrys (7 taxons). Une de ces espèces est mentionnée comme endémique algéro-tunisienne (Dactylorhiza elata (Poir.) Soó subsp. munbyana (Boissier & Reuter) Kreutz. Cette diversité d’orchidées nécessite une conservation par la mise en défens de leur l’habitat.

Résumé: The Analysis of the flora diversity of Guaraet Ouajaa between the period 2015- 2016 revealed the existence of 125 taxa belonging to 48 families and 102 genera. This flora is dominated by therophytes 54%. Of the listed vascular plant species, 32 are of Mediterranean origin. Three endemic taxa have been inventoried, two of which are rare. Urgent protection efforts must be made to conserve this wetland and the species under its control.

Résumé: Afin de connaitre les principales espèces de plantes mellifères de la péninsule de l’Edough (Nord-Est algérien), nous avons effectué un inventaire des plantes vasculaires dont les fleurs ont été butinées par des abeilles (Apis mellifera L.). Cette étude nous a permis de mettre en évidence l’existence d’une flore diversifiée, (107 espèces butinées sur 582 espèces en fleurs), composée surtout de plantes spontanées (92) et aussi de plantes cultivées (7 arbres fruitiers et 8 plantes maraîchères). Parmi les 36 familles concernées, les plus représentées sont les Fabacées (14 espèces), les Astéracées (13) et les Lamiacées (12). Les couleurs des fleurs les plus représentées sont le blanc (50% des espèces) et le jaune (26%). Les aliments récoltés sur les fleurs par les abeilles sont le pollen et le nectar ensemble (54 espèces, et qui sont plus visitées), le pollen seul (51) ou le nectar seul (2). Pour une bonne production du miel il faudrait protéger cet habitat contre les fortes pressions humaines.

Résumé: Cet article concerne une nouvelle observation de Sixalix farinosa (Coss.) Greuter et Burdet (Dipsacaceae) sur la côte de la péninsule de l’Edough en Algérie. Cette espèce a longtemps été considérée comme endémique de Tunisie, jusqu’en 2004 où elle a été découverte pour la première fois en Algérie (Véla et al., 2012). Nous discutons de la nouvelle station découverte, distante de 83 km de la première station algérienne connue. Les falaises maritimes de la Voile noire, où cette rare espèce a été découverte, nécessitent une surveillance et une protection particulières.

Résumé: The recent discovery in Algeria (North Africa) of Soleirolia soleirolii (Req.) Dandy (Urticaceae) endemic to the Tyrrhenian area is here reported. Due to the limited distribution area (Edough peninsula North-East Algeria), a particular conservation attention is to be paid in Algeria.

Résumé: Rediscovery of Limonium narbonense Mill. (Plumbaginaceae) in Algeria (El Tarf, Numidia North - East Algerian) Mots clés: Limonium narbonense Mill., redécouverte, Algérie, Afrique du Nord. Key words: North Africa, Rediscovery, Limonium narbonense Mill., Algeria flora.

Résumé: L’auteur signale la découverte récente en Afrique du Nord et notamment en Algérie d’une invasive de la famille de Onagraceae. L’onagre rose, Oenothera rosea L’Hér. ex Aiton originaire de l'Amérique. Cette découverte entre dans la révision de la flore algérienne (indigène et exotique). Mots clés. Oenothera rosea L’Hér. ex Aiton, nouvelle xénophyte, Algérie, Afrique du Nord

Résumé: Ce travail actualise les connaissances sur les Orchidées de la péninsule de l’Edough (Nord-Est algérien). Il a permis de mettre en évidence la présence de vingt espèces. Parmi elles se trouvent des espèces endémiques d’Algérie et du Maghreb et d’autres espèces rares particulièrement remarquables dont Serapias lingua L. subsp. stenopetala (Maire & T. Stephenson)Maire & A.Weiller une endémique stricte de la Numidie. Une précision stationnelle et biogéographique a permis de connaitre l’aire de répartition de chaque taxon recensé.

Résumé: Thymus ciliatus is a plant widely used in traditional medicine, for her therapeutic proprieties attributed essentially to essential oil. The aim of this work is to determine the differences in chemical composition and antioxidant activity of essential oil at different harvest period. The composition of essential oil was analyzed by GC-MS was showed that essential oil obtained at vegetative, flowering, after flowering stage was characterized with thymol (33. 39%), carvacrol (30.85%) and carvacrol (31.37%) respectively, their essential oils was screened for antioxidant activity using DPPH assay, and reducing power, the essential oil obtained after flowering showed the best antioxidant than vegetative and flowering stage with IC 50 to 438 ± 9.07μg / ml, 580 ± 1.15 μg / ml, and 590 ± 8.62μg/

Résumé: The Cap de Garde (North-East Algeria) has a rich floristic, estimated at 349 species representing 254 genera and 87 families. These species are either strictly subservient to the insular climate or transgressive to terrestrial environments. This work therefore focuses on the systematic study of the flora, the phytogeographical and biological significance of the floristic of this region. The preservation of this short-term exceptional biodiversity requires the urgent establishment of scientific studies and appropriate safeguards.

Résumé: Ce document est un travail de synthèse des données récentes concernant les Orchidées du nord-est de l’Algérie. Les régions concernées sont la Kabylie au sens large et la Numidie historique algérienne avec ses montagnes adjacentes du Hodna et de l’Aurès. Ce sont des territoires très divers sur le plan géographique (du littoral jusqu’à + de 2000m d’altitude), bioclimatique (de l’étage semi-aride à l’étage per-humide) et lithologique (alluvions, calcaires, dolomies, argiles, schistes, grès, granites, etc.). Toutes les données publiées à partir de 2005 ont été synthétisées et beaucoup de données inédites observées à partir de 2002 ont été rassemblées grâce à une quinzaine de collaborateurs. Malgré cela de nombreux secteurs sont encore vierges de prospection et devront être investigués à l’avenir. C’est donc 55 espèces qui ont été illustrées et cartographiées. 8 autres sont connues historiquement mais n’ont pas encore été retrouvées. Enfin une dernière a été signalée par le passé par erreur. Les principaux synonymes sont rappelés. Le choix taxonomique s’inspire d’un travail récent similaire effectué sur les Orchidées de Tunisie, à quelques réarrangement près au niveau des genres. Une combinaison nomenclaturale nouvelle a été créée pour l’occasion (Androrchis pauciflora subsp. laeta). Un appel à contribution est lancé auprès de tous les botanistes professionnels et amateurs algériens afin de poursuivre le travail à l’échelle de tout le Tell algérien.