Carolina Basswood (Tilia americana var. caroliniana)

Tilia americana - Trees and Shrubs Online

11 Different Types of Linden Trees (with Photos)

Plant Information Center - Tilia americana var. caroliniana

Tilia americana L. var. heterophylla (Vent.) Louden - American basswood

Linden Trees: Types, Leaves, Flowers, Bark – Identification (with Pictures) » Golden Spike Company

White Basswood (Tilia americana var. heterophylla)

How to Identify American Basswood Trees

Tilia americana L. var. heterophylla (Vent.) Louden - American basswood

American Basswood media - Encyclopedia of Life