S. concinna is one of the micro-miniature sinningias; S. nordestina is much larger and quite rangy. However, both are in the Corytholoma clade of Sinningia so more closely related than appearance would suggest. Together they make for a beautiful hybrid.
While S. ‘Jung’s Rose Talk’ may not itself be quite small enough to warrant classification as a microminiature, we are including it in that set for information purposes.
A close view of the flower can be seen by clicking the link below.