Total pollen production per inflorescence and per square meter were studied in anemophilous species of the Poaceae family, to determine the relative contribution of each species to the total load of pollen released and to identify the species with the highest potential pollen emission. This was done by calculating the number of pollen grains per flower and per inflorescence and by estimating the density of inflorescences in an area of one square meter. Pollen production per inflorescence varied between 12,000 and 15 million grains, often being higher in the perennial species. Mountainous, grassland, riverside, and littoral areas contributed similarly to the amount of pollen grain production per square meter. Species such as Gaudinia fragilis, Hordeum murinum, Lolium rigidum, and Trisetaria panicea, with high pollen records, were found in all the studied areas. Aerobiological analysis will be undertaken to determine the main pollen season of Poaceae species. The results obtained are of great importance for respiratory health management in this region.

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Poaceae pollen is one of the most prevalent aeroallergens causing allergenic reactions. The aim of this study was to characterise the grass pollen season in Tetouan during the years 2008-2010, to analyse the effect of some meteorological parameters on the incidence of the airborne Poaceae pollen, and to establish forecasting variables for daily pollen concentrations. Aerobiological sampling was undertaken over three seasons using the volumetric method. The pollen season started in April and showed the highest pollen index in May and June, when the maximum temperature ranged from 23 to 27 °C, respectively. The annual pollen score recorded varied from year to year between 2,588 and 5,404. The main pollen season lasted 114-173 days, with peak days occurring mainly in May; the highest concentration reached 308 pollen grains/m(3). Air temperature was the most important meteorological parameter and correlated positively to daily pollen concentration increase. An increase in relative humidity and precipitation was usually related to a decrease in airborne pollen content. External validation of the models performed using data from 2011 showed that Poaceae pollen concentration can be highly predicted (64.2-78.6 %) from the maximum temperature, its mean concentration for the same day in other years, and its concentration recorded on the previous day. Sensitive patients suffering allergy to Poaceae pollen are at moderate to highest risk of manifesting allergic symptoms to grass pollen over 33-42 days. The results obtained provide new information on the quantitative contribution of the Poaceae pollen to the airborne pollen of Tetouan and on its temporal distribution. Airborne pollen can be surveyed and forecast in order to warn the atopic population.

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EthnobotaniqueRésumé : Après avoir brièvement décrit le contexte géogra-phique de leur travail, le Tassili n-Ajjer, région désertique montagneuse du Sahara central, les auteurs abordent le sujet des plantes médicinales et l'intérêt que leur portent les habitants. Des précisions sont ensuite données sur ces plantes et leurs usages : modes de préparation des remèdes, types de maladies. En fait, il s'avère que la plante médicinale garde encore sa place mais nécessite des recherches exhaustives même si nombre de scientifiques s'y sont intéressés depuis le siècle dernier. Un tableau, qui recense douze espèces et leurs utilisations, complète le texte.Abstract: After having briefly described the geographical context of their work, a mountainous desert region of the central Sahara called the Tassili n-Ajjer, the authors broach the subject of medicinal plants and the interest the inhabitants have for them. Further information is then given on these plants and their use: preparation of remedies, types of illness. In fact, the medicinal plant still has an important role but needs exhaustive research even though many scientists have taken an interest in them since the last century. To complete the text there is a table regrouping twelve species and their use.