[Ambrosia, Franseria, Xanthium from the Bonaparte Herbarium]. / Ambrosia, Franseria, Xanthium de l'herbier Bonaparte.

Recently, French Association for Ragweed Study (AFEDA) founders published, in French, a book "Ambrosia, ragweed, biological pollutants". This association was founded in 1982. The authors referred to Bonaparte Herbarium set up in the Université Claude-Bernard Lyon 1. This herbarium is ranking second in France and seventh in the world. There were three aims for this work: to set up, for this herbarium, a complete list of different species of Ambrosia, Franseria and their pollen grains and to study with them Xanthium whose pollen grains look like Ambrosia, to establish a chronological order for Ambrosia that were collected in Europe and in some countries of the New World, to compare some pollen grains of Ambrosia and Xanthium (scanning electronic microscope). Good state plants in spite of about a century of conservation could be selected. They were photographied and some pollens so. The consultation of this herbarium brought a better morphological knowledge of different species of Ambrosia, Franseria and Xanthium, (plants and pollen grains). The authors were able to broadcast this knowledge to scientists and interested public through their book.

[Overview of the history of the Ambrosiinae insofar as it can be demonstrated by pollen grains]. / Aperçu sur l'histoire des Ambrosiinae telle que l'on peut la mettre en évidence par les grains de pollen.

The Ambrosiinae and more particularly Ambrosia are known as native of America. However some pollen grains of "Ambrosia type" have been found in Neogene and Quaternary sediments from SE France.

[A glimpse of the history of the genus Artemisia from pollen analyses]. / Aperçu sur l'histoire du genre Artemisia d'après les analyses polliniques.

The first certain data about the pollen grains of Artemisia have been found about the Middle Miocene. A review of the recent works concerning Western Europe and Northern Africa allows us to have some confirmation of this point of view. The pollen of Artemisia is appearing in the Miocene (Serravallian) with very poor amounts, the first important spreading of this plant, as revealed by sporopollinic analysis, comes near the Tertiary-Quaternary boundary at the time of an important deterioration of the climate. For the Quaternary, Artemisia is often present with low percentages and is only developing during the glaciation. In the Upper Quaternary, after the glaciation, the vegetation with Artemisia especially widens because of the man influence: clearing and/or breeding. This plant, which actually gives us many environmental problems, seems to have been differentiated a short time ago. It is a wind-pollinated vegetable, perhaps issued from the Compositae Anthemidae which have an echinulate pollen grain, the spines have been reduced almost to relics by adaptation to the wind dispersion.