A revision of the 79 recognised species, five of these with subspecies or varieties. Sixteen species and nine subspecies or varieties are described as new. Ten colour plates, 34
line drawings and 26 distribution maps are provided, together with keys to the genus and the informal groups.
- ISBN13 9781842461242
- Publish Date 1 January 2005
- Publish Status Active
- Out of Print 21 December 2022
- Publish Country GB
- Publisher Royal Botanic Gardens
- Imprint Kew Publishing
- Format Paperback
- Pages 112
- Language English