The Vegetative Key to the British Flora: a new approach to naming British vascular plants based on vegetative characters The Vegetative Key to the British Flora: a new approach to naming British vascular plants based on vegetative characters. John Poland , Eric J. Clement with Cyperaceae by Colin Smith . 2009. 526 pp. John Poland, Southampton, in association with the Botanical Society of the British Isles. London. USD $41.00. ISBN: 978-0-9560144-0-5. Paper with laminated covers.