There are four extremely similar American Crabapple species that differ only in slight shapes of leaves and state of some hairiness on leaves and twigs: this Sweet Crabapple, the Prairie Crabapple, the Southern Crabapple, and the Biltmore Crabapple in a section of the Appalachian Mountains. Sweet Crabapple is found in the wild from New York to north Georgia to northeast Illinois. The leaves are 2 to 4 inches long and more or less lobed and some are sort of triangular, the base is usually rounded, and leaves only have some hair under leaves when young. The twigs are wooly only when young. The flowers are about 1.5 inches across and are white and pink and bloom in late May to early June. The fruit is crabapples about 1.5 inches in diameter and are yellowish-green when mature. It is a small tree with wide-spreading rigid branches with some thorns and a broad, bushy crown. I've never seen it in landscapes, and only native plant or specialty nurseries grow some. It grows about 1.5 feet/year and lives about 50 to 100 years. (The Crabapples grown in landscapes are east Asian species that have smaller red or yellow fruit and smaller but more profuse flowers.) I ordered three little potted plants by mail from Reeseville Ridge Nursery in central Wisconsin in spring 2018 and put them in larger pots, and in 2021 I planted them in a meadow site next to a landscape in Downingtown, PA, dedicated to remembering the nut & fruit tree nursery of John Hershey of the 1920's into the 1960's. One small, young tree was destroyed by the deer.
Apple Cedar Rust Disease that is a fungus with an alternate life cycle between some American Junipers (especially Eastern Redcedar) and Apples & Crabapples is often hard on this species, along with other American Crabapple species. The disease probably came from China and/or Japan because crabapple species from there are usually resistant or at least somewhat resistant. It was the native Crabapples that were renown for bearing fruit for making jams and jellies.

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