This species has distinctly auriculated leaves and large, yellowish-white, fragrant flowers.
"Hardy Ornamental Flowering Trees and Shrubs" by A. D. Webster
Petals 3, oval, bi-auriculate above the very short claw.
"The Manual of the Botany of the Northern United States" by Asa Gray
Most examples have auriculated bases with contracted, pointed, or rounded basal edges.
"Handbook of Alabama Archaeology: Part I Point Types" by James W. Cambron
But best of all are the words that shape the leaves –
Orbicular, cordate, cleft and reniform –
And their venation – palmate and parallel –
And tips – acute, truncate, auriculate.
"Learning the Trees" by Howard Nemerov