Dioscorea sp Borneo (narrow leaf)Dioscorea sp Borneo (narrow leaf) at a glance: Dioscorea sp. Borneo (Narrow Leaf) is an undescribed climbing yam from northern Borneo that grows from a persistent rootstock and produces fresh seasonal vines each cycle. Its long, narrow leaves are the main feature, coloured deep green with a subtle silver sheen that gives the plant a cooler, more metallic surface than many broader leaved Dioscorea. During active growth it prefers bright indirect light