Another one flowering the first time for me - Hypoxis filiformis. It is a really small flower, maybe one and a half centimeter and opens to a clear yellow star in the morning, later it closes three petals and you can see the green colour of the outside of the petals.
It is a member of the Hypoxidaceae. I got some seed from Southafrica four years ago and now it shows the first flowers. It looks special with this yellow stars and the dark green, hairy leaves.