A well known plant company based in Paignton supplied me with plants which were advertised as violas, but when they arrived they had pansy sized flowers. Their customer service told me that due to breeding, the plants are now more compact with larger flowers!
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The Latin name for pansy is Viola.
If you live in Derbyshire, as I do.
If you do a search online, there are descriptions of viola versus pansy.
Four petals up and one down is Pansy.
Two up and three down Viola.
This is on lots of sites but there are probably ones discrediting the above descriptions. But it may be a start for you to verify?
Try looking for people with National collections or specialist hobbyists. They are usually the most knowledgeabley correct.
Good Luck.
I purposely bought these to fill in gaps between other violas in planters and the flowers are twice the size of the existing violas.
Very disappointed to have been "fobbed off" as I did not receive what I ordered.
People expect Pansies to have large flowers... violas we expect to have smaller flowers.. these are not plants I ever buy online as they are sold virtually everywhere these days, so one can pick them out, but nevertheless.... you had certain expectations according to their listed inventory with accompanying photos...