Large magnolia, or, Big laurel (Magnolia grandiflora)
"The Large-flowered Magnolia claims a place among the largest trees of the United States. […] The flowers are white, of an agreeable odor, and seven or eight inches broad. They are larger than those of any other tree with which we are acquainted, and on detached trees they are commonly very numerous. Blooming in the midst of rich foliage, they produce so fine an effect that those who have seen the tree on its native soil agree in considering it as one of the most beautiful productions of the vegetable kingdom."
This illustration and the description are from volume two of "The North American sylva ; or, A description of the forest trees of the United States, Canada, and Nova Scotia ... to which is added a description of the most useful of the European forest trees," by François André Michaux, 1770-1855 (Published by D. Rice and A. N. Hart, 1859-1865)