There are two recent online photo database useful for azalea identification and background information:
1. Mark Nijland of the Netherland’s Azalea Database with over 1,500 cultivar, some with images, parentage of the cultivars and Japanese kanji names.
azaleadatabase.com

2. Azalea Society of America’s new ongoing database with more information than the old photo database.
azaleas.org

For those unfamiliar with ASA’s pBase, here is the link:
These are very useful photo database in English besides the Japanese Satsukimania site and the Satsuki dictionary; the publisher of the dictionary has gone bankrupt and it is likely there might be no new updates. So grab one if you see it for sale.
1. Mark Nijland of the Netherland’s Azalea Database with over 1,500 cultivar, some with images, parentage of the cultivars and Japanese kanji names.
Pictures, descriptions and parentage of azalea varieties
A database with over 1500 evergreen azalea varieties, including photos and parentage. Important cultivar groups like satsuki, Kurume, obtusum, Hirado, Belgian indica and American varieties are listed. Wildtype species are also included.


2. Azalea Society of America’s new ongoing database with more information than the old photo database.
searchable azalea database
This searchable azalea database has more than 11,000 entries--Many entries have photos in addition to growth and cultural information.


For those unfamiliar with ASA’s pBase, here is the link:
These are very useful photo database in English besides the Japanese Satsukimania site and the Satsuki dictionary; the publisher of the dictionary has gone bankrupt and it is likely there might be no new updates. So grab one if you see it for sale.