Aulden Farm:  www.auldenfarm.co.uk

British Iris Society: www.britishirissociety.org.uk

West and Midlands Iris Group: www.westandmidlandsirisgroup.org.uk

Plant Heritage:  www.nccpg.com

Historic Iris Preservation Society. www.historiciris.org

Iris Paradise, Germany:   www.irisparadise.com

Claire Austin:  www.claireaustin-hardyplants.co.uk

Seagate irises:  www.irises.co.uk 

Woottens of Wenhaston: www.woottensplants.com

Rare Plant Fair:  www.rareplantfair.co.uk

Val Bourne's article in the Telegraph on-line: http://www.telegraph.co.uk/gardening/plants/10159915/The-sheer-bliss-of-finding-a-lost-iris.html