[Poaceae pollens. Comparison of Poaceae pollens in 1999 among Marseille, Gap, and Briançon 2000 meters].

Pollens of Poaceae remain the major concern of all those which are concerned with the allergies. The grasses in question are ubiquitaires, but the variations due to climate and the relief influence much on the statements. Our country, from its geographical richness and by the number of sites of collecting, allows an interesting synthesis and a better comprehension of the metabolism of the plant. We are interesting here in the sites of Nimes, Aixen-Provence, Gap and Briançon, included in the National Network. Moreover, one sensor placed temporarily at 2,000 meters of altitude, meadows of Briançon, gives one further information.