Martin Sykes wrote:

Vinca1 : Purple flowers, slight variegation
http://www.users.globalnet.co.uk/~sy...ocs/vinca1.jpg

Vinca major maculata

Vinca2 : Purple flowers, stong variegation with golden edge to leaves
http://www.users.globalnet.co.uk/~sy...ocs/vinca2.jpg

Vinca major variegata

Vinca3 : Almost white flowers, no variegation
http://www.users.globalnet.co.uk/~sy...ocs/vinca3.jpg

Vinca minor alba