Biology and ecology of Porophyllum ruderale (Jacq.) Cass., a Compositae newly emerged in Cote d'Ivoire.
In the Ivorian flora, the Compositae family is represented by 108 species, distributed among 46 genera of which only 6 are African. Several species of this family have been invasive and some have become a calamity. The presence of a species of Compositae, Porophyllum ruderale (Jacq.) Cass., hitherto unknown to Ivorian flora, has been observed since some years. This study aimed to collect data on the biology and ecology of this species. The evaluation of the germination of the seed and the monitoring of the development of the plants of this species, from germination to flowering, showed that it had a high rate of germination and exponential growth during the vegetative stage. Determination of its specific leaf area and dry matter per unit of fresh material indicated that it had a strategy for allocating the resource in growth and reproduction. The surface survey carried out in different agrosystems showed thatPorophyllum ruderale was an invasive species of open agrosystems. Its high dispersal capacity associated with its intrinsic biological capabilities allowed it to quickly conquer space when introduced into the environment. Effective management of the species best consist in its destruction before the flowering stage.