When I first started working with roses and discovered I was going to need to distinguish between 30 or 40 pinks and know their names, I resorted to flash cards: the kind young children use to learn words. In no time at all I was well on the way to a lifetime of floral nitpicking. Is a the shape of a double flowered rose technically a shallow cup, recurved, a pompon or a chalice? That kind of thing.
So I often notice when people mistake a peony or a camellia for a rose, even if I’d have to concede that the colours and forms of their flowers can be essentially the same.