I found two treasures while touring Magnolia Plantation in Charleston, South Carolina.
The first is a hardy orange tree called Chinese Bitter Orange. Its scientific name is Poncirus trifoliata.
It has long, tough thorns.
The fruit is not edible alone, but may be used in marmalade or condiments.
The second is called Confederate Rose. It is a tree hibiscus also called Giant Rose Mallow.
Its scientific name is Hibiscus mutabilis.
There were thousands of plants on this lovely plantation.
These two were my favorites.