“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
Hose-in-Hose Double
The American Daylily Society

“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