Ulmus × diversifolia, also known as the Diverse Leaved Elm, he recorded its distribution in which county town of Hertfordshire, England, and is also a civil parish in the East Hertfordshire district of the county?
Hertford: Hertford (/ˈhɑːfəd/, /ˈhɑːtfəd/) is the county town of Hertfordshire, England, and is also a civil parish in the East Hertfordshire district of the county.
i don't know