Subtitel: A Guide to Woody Climbers in the Tropical Forests of Guyana, Suriname and French Guiana Lianas (woody vines) are iconic symbols of tropical forests around the world. These plants use the energetically expensive investment of trees in woody stems to gain relatively inexpensive access to the light-rich canopy. The evolution of a climbing habit has occurred in many unrelated plant groups using twining and clasping shoots or specialized structures such as tendrils, hooks, spines, adhesive roots, and internal stem anatomy. Lianas contribute significantly to tropical forest diversity (25-40% of species), carbon sequestration, biomass, plant-animal interactions and forest gap dynamics. Although they are often considered pests in commercial forestry, woody climbers are important to many traditional peoples as medicines, subsistence fibers and non-timber forest products. Largely due to their inaccessibility, lianas and other climbers remain among the most poorly documented lifeforms in the tropics.