The leaves of elm are single and alternate. The leaves are oval or oval lanceolate. The edge of the leaves has multiple serrations.
Sassafras leaves alternate. At the top of the branch, it is oval or obovate, 9 to 18 cm long and 6 to 10 cm wide. The apex of the leaf is gradually sharpened, the base is cuneiform, the leaf is whole or slightly lobed, the apex of the lobe is slightly blunt, the leaf is paper, green on the top and gray green on the bottom.
Elm flowers are bisexual, the flowers are purple brown, the cymes are clustered, the flowers bloom in the early spring, or both.
The inflorescence of sassafras is terminal, 4-5cm long, with several small flowers inside. The flowers are yellow, about 4mm long. The flowers have 6 petals, which are lanceolate, about 3.5mm long.