Claim: Florentine (a variety of Tuscan language, a Romance language) can be distinguished from Standard Italian by differences in phonology, morphology, syntax and lexicon; the most commonly noticed is the gorgia toscana, a consonant-weakening rule widespread in Tuscany in which the voiceless plosive phonemes /k/, /t/, /p/ are pronounced between vowels as fricatives [h], [θ], [ɸ] respectively.
Evidence: Florentine, and Tuscan more generally, can be distinguished from Standard Italian by differences in numerous features at all levels: phonology, morphology, syntax and lexicon. The Florentine dialect or vernacular (dialetto fiorentino or vernacolo fiorentino) is a variety of Tuscan language, a Romance language, spoken in the Italian city of Florence and its hinterlands. Perhaps the difference most noticed by Italians and foreigners alike is known as the gorgia toscana (literally 'Tuscan throat'), a consonant-weakening rule widespread in Tuscany in which the voiceless plosive phonemes /k/, /t/, /p/ are pronounced between vowels as fricatives [h], [θ], [ɸ] respectively.