Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Ancient Greek πέταλον
Ancient Greek πετάννυμι (mention)
Proto-Indo-European *peth₂- (root)

English petal (borrowed)
English dialypetalous (derived)
English petalism (mention)
English petalody (mention)
Spanish pétalo (borrowed)
French pétale (mention)
Ancient Greek καλλιπέταλον (affix)
Ancient Greek πέτηλος (mention)
Italian petalo (mention)
Latin pando (cognate)
Translingual Petalophyllum (mention)
Norman pétale (mention)