A monograph of the neotropical Gnetaceae

BACKGROUND AND AIMS: After having contributed treatments of Gnetum for various regional floras in the neotropics, it was decided to produce a monograph of the genus for the new world. METHODS: Specimen data from herbarium species were collected and recorded. Type specimens and synonymy were determined for each species. KEY RESULTS: A new species endemic to Vaupés, Colombia is described and illustrated. It is compared to the other neotropical species of Gnetum. A key to the nine neotropical Gnetum species is given as well as descriptions of those species with relevant specimen citations, distributions, and images.