North American Atlantic region

Moreover, as has long been noted (e.g. by Joseph Gerhard Zuccarini and especially by Asa Gray), a large number of relict genera (Liriodendron, Hamamelis, Stewartia etc.)

The fossil record indicates that during the Tertiary period a warm temperate zone extended across much of the Northern Hemisphere, linking America to Asia.

It stretches from southernmost Ontario and Quebec to Arkansas and easternmost Texas and from central Georgia and Alabama to eastern Iowa and southeastern Minnesota.

The remaining wildland of the province is covered predominantly by temperate broadleaf and mixed forests dominated by oaks, hickories, maples and Tsuga and is characterized by the highest degree of endemism within the floristic region.

[1][2] The Atlantic and Gulf Coastal Plain province is a strip of coastal plain, very narrow on the north, lying to the east and south of the Appalachian Province and stretching from the southernmost Nova Scotia through Georgia and Florida to eastern Texas, extending into the Mississippi Embayment up to the southern tip of Illinois.