Welcome to Xyridaceae

The Xyridaceae are characterized by their grass-like appearance. The genus Xyris has the most species and the flowers are predominantly yellow.  A few species are widely used as “everlasting flowers”, together with species of other families of the Poales (Eriocaulaceae, Rapateaceae, Poaceae, and  Cyperaceae). Some species of Xyris are included in the Red List of the Brazilian flora because of the threats to their survival posed by micro-endemism, commercial collecting of wild populations and habitat loss. There are five genera Xyris (ca. 400 spp.), Abolboda (ca. 23 spp.), Achlyphila (one sp.), Aratitiyopea (one sp.), Orectanthe (two spp.) e. Most of the species of Xyris  occur in tropical and subtropical regions, although there are species in temperate areas of America, Asia and Australia. The other genera are neotropical; Abolboda has its greatest diversity in Venezuela and northern Brazil, but extends as far as southeast Brazil as well. The genera Achlyphila, Aratitiyopea and Orectanthe are also exclusively neotropical with most species occuring on the Guayana Shield, but also reaching into Brazilian Amazonia.

The classification and nomenclature used in eMonocot-Xyridaceae are based on those of the World Checklist of Monocots. The taxonomic information provided here is from revisions, monographs and data provided by taxonomists specializing in the family systematics.

The goal of this website is to provide a complete taxonomic treatment for the family with descriptions, figures and images, distribution maps, specimen databases, and identification keys. At the present time the genera Xyris and Abolboda are being revised and new field research, and taxonomic and phylogenetic studies are in progress.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith