Sinningia canescens and Sinningia leucotricha

Photo by Ron Myhr
Grown at Geneva Botanical Garden 

Sinningia canescens and Sinningia leucotricha are similar species.  The former (on the left) is larger and coarser, while the latter has a particularly decorative sheen of silvery hairs on the leaves.  Both grow best with a portion of the tuber exposed above ground -- the exposed part of the tuber is often referred to as a "caudex".  A closeup of the flowers can be seen here.