Hello,
This photo is not of Streptocarpus ionanthus subsp. ionanthus. Streptocarpus ionanthus subsp. ionanthus does not look like this, it has different leaf and flower color. None of the plants in this photo are ionanthus subsp. ionanthus.
@Calif_Sue
(The only photos that seem to be correct are MadisonAV and Calif_Sue)