I had no idea that the flowers on this Hoya would be so small. They are less than a 1/4 inch across. Below I took one of the flowers and put it next to a Hoya amicabilis to give an idea as to size:

The flowers of H. amicabilis are small, but H. medusa flowers are even smaller. The blooms are long lasting staying on for around 10-14 days. There was no detectable scent.