Begonia subacida

This species was described in 1959 by Edgar Irmischer.  It is a rhizomatous species native to Brazil.  It is said to be syn. with U304.  The leaf undersides are a beautiful rosy pink, as are the stems.  Foliage is greenish-purple, with cream or pale green leaf venation.  The leaves grow very closely together, forming a compact mound.  The leaves are tilted upwards in my experience.  There are hundreds of hairs on each leaf, which are pink, giving the leaves a nice velvety feel.