Citron
A source of confusion is that "citron" or similar words in French (and other languages), and English are false friends, as they refer to the lemon. Indeed, into the 16th century, the English name "citron" included the lemon and perhaps the lime as well.
Rangpur (fruit)
"Citrus" × "limonia" was introduced into Florida in the late nineteenth century by Reasoner Brothers of Oneco, who obtained seed from northwestern India. Though often described as a lemon hybrid, genomic analysis has shown it to be an F1 hybrid of a female citron ("Citrus medica") and a male mandarin orange ("Citrus reticulata").