Which tree is referred to as Sawleaf Zelkova?

The Sawleaf Zelkova is indeed referred to as Zelkova serrata. This deciduous tree is known for its attractive, serrated leaves that give it the common name "Sawleaf." Zelkova serrata is appreciated in landscaping for its resilience, ability to tolerate urban pollution, and its beautiful, arching structure, which makes it a popular choice for streets and parks.

In contrast, the other options are different species with distinct characteristics. Quercus rubra, commonly known as the Northern Red Oak, is a large deciduous tree known for its acorns and strong wood. Robinia pseudoacacia 'Frisia,' or 'Frisia' Black Locust, is recognized for its compound leaves and bright yellow foliage, while Salix alba 'Tristis,' or Weeping Willow, is known for its long, drooping branches and preference for wet environments. Each of these species serves different purposes in landscaping and ecology, making it clear why Zelkova serrata specifically is referred to as Sawleaf Zelkova.