"Petaline" is a word in ENGLISH

Of, pertaining to, or resembling, a family of plants which have four petals arranged like the arms of a cross, …

Pertaining to, or resembling, a natural order (Orchidaceae) of endogenous plants of which the genus Orchis is the type. They …

Of or pertaining to that surface of a carpel, petal, etc., which faces toward the center of a flower.

Of or pertaining to the vexillum, or upper petal of papilionaceous flowers.