Dear Jane and others The articles proposing the subdivision of Scilla are: Speta F 1998 Hyacinthaceae In K Kubitzki, Families and Genera of Vascular Plants 3: 261-285. Speta F 1998 Systematische Analyse der Gattung Scilla L. s.l. (Hyacinthaceae). Phyton (Austria) 38(1): 1-141 Pfosser M, Speta F 1999 Phylogenetics of Hyacinthaceae based on plastid DNA sequences. Annals of the Missouri Botanical Garden 86(4): 852-875 Wetschnig W, Pfosser M 2003 The Scilla plumbea puzzle: present status of the genus Scilla sensu lato in southern Africa and description of Spetaea lachenaliiflora, a new genus and species of Massonieae (Hyacinthaceae). Taxon 52(1): 75-91 Regards Julian Slade