1、 Leaf difference

The leaves of elm are single and alternate, the leaves are oval or oval lanceolate, and the edges of the leaves have multiple serrations

Sassafras leaves alternate. Gathered at the top of the branch, oval or obovate, 9 to 18 cm long and 6 to 10 cm wide, the apex of the leaf gradually becomes sharp, the base presents a wedge, the leaf is entire or slightly lobed, the apex of the lobe is slightly blunt, and the leaf is papery, green above and grayish green below

2、 Flower difference

Elm has bisexual flowers, purplish brown flowers and clusters of cymes. The flowers bloom first or at the same time in early spring

The inflorescence of sassafras is terminal, 4 to 5 cm long, with several small flowers. The flowers are yellow, about 4 mm long, and the flowers have 6 petals, lanceolate, about 3.5 mm long