this term was coined to apply to both the sepals and the petals of an orchid, excepting the lip or labellum.
The petals and sepals of a flower when they are indistinguishable in terms of their color, shape and size.
Petals and sepals that are almost indistinguishable from each other, as in rushes ( Juncus sp).
When petals and sepals are all alike, as in Death-Camas and some other members of the Lily family.
Used in reference to sepals and petals which are not readily differentiated, both being either sepaloid or petaloid.