Abstract
Construction of a seed identification key for 55 weeds of La Réunion Island Description of the subject. The identification and characterization of weed seeds is essential for future research on understanding their secondary harmfulness (weeds' ability to disperse in space and time). Although they are major bio-aggressors in tropical agriculture, the identification of weed seeds of tropical species is still little studied. Objectives. The aim of this study was to develop a methodology for identifying tropical weed seeds based on their morphological characteristics. Method. Seeds of 55 weed species were collected in La Réunion Island and characterized. A polytomous, single-access identification key was constructed, enabling species identification from seed. Results. The identification key begins by discriminating seeds by shape, then size, followed by color, texture, hairiness or particular markings. The key is published in PDF format and includes hypertext links enabling the user to navigate through the document and access the seed description sheet. The key is available on the AGRITROP site (CIRAD open archives) and on the WIKTROP portal. Conclusions. This identification key is the first of its kind for tropical weeds. It is intended to be enhanced as new tropical weed seeds are characterized in Réunion Island and elsewhere.