"Hose-in-Hose" doubles have extra whorls (layers) of petals so that there appears to be a flower within a flower.
See also: double, floral whorl
'LAVENDER MOONBEAM' hose-in-hose double. Photo by Patrick Stamile. Used with permission.
'TRUFFLICIOUS' (Kirchhoff 2005) hose-in-hose, Photo by David Kirchhoff. Used with permission.