'latifolious' ultimately originates from Latin, specifically from 'latifolius' (New Latin formed in botanical usage), where 'latus' meant 'broad' and 'folium' meant 'leaf'.

'latifolius' (Latin/New Latin, used in botanical Latin) was adopted into English botanical descriptive usage as 'latifolious', preserving the original compound meaning.

Initially it meant 'broad-leaved' in Latin botanical contexts, and over time it has retained that same descriptive meaning in English botanical usage.