Sinningia pusilla - a very pretty micro-miniature gesneriad that is very easy to grow.  This plant is related to African violets, Chiritas, Epicias, Streptocarpus, etc. I grow the plants in a "dry" fish tank to keep the humidity levels up, especially in winter with dry heat.  Seeds are for sale in my Etsy Shop. Below are some photos, and the general directions for starting them are at the page Gesneriads. There are also a few videos about these plants on my YouTube Playlist: Horticulture