  We describe HST imaging of recent star formation complexes located in the
extended UV disk (XUV-disk) component of NGC 5236 (M 83), NGC 5055 (M 63), and
NGC 2090. Photometry in four FUV--visible bands permits us to constrain the
type of resolved stars and effective age of clusters, in addition to
extinction. The preliminary results given herein focus on CMD analysis and
clustering properties in this unique star-forming environment.
