Identifying That Mystery Tree: Likely a Flowering Crabapple

Key Identification Features Match Crabapple

Your description—small tree (near apple height), rounded triangular form, simple toothed elliptical leaves, green-to-reddish-orange fruit (≤2″) in early September, no thorns—strongly indicates flowering crabapple (Malus spp.).

Crabapple vs. Apple: The Critical Difference

• Fruit size: Crabapples ≤2″ diameter; apples >2″.
• Flavor: Crabapples tart/bitter (your "extremely bitter" note); apples sweet/tart.
• Ornamental value: Many crabapples selected for persistent winter fruit display.
• Wildlife value: Birds, deer relish the fruit.

Common Cultivar Traits

• Mature height: 15-25 ft (fits "2-3 ft taller than apple tree").
• Form: Rounded, spreading, often wider than tall.
• Bloom: Spring (white, pink, red) before or with leaves.
• Fruit: ¼-2″, yellow/orange/red/purple; some persist into winter.
• Foliage: Simple, serrate, elliptical to ovate.

Is It Safe for Kids?

Yes. Crabapples are non-toxic. Bitter taste prevents overconsumption. Larger-fruited varieties make excellent jelly. No adverse reactions expected from occasional sampling.

Confirmation

For definitive ID, compare spring flowers and fall fruit to local nursery specimens or extension resources. But all evidence points to crabapple.