The cultivars below may be only available in the USA.
Cultivars
'Chicagoland'
This vigorous solitary trunk tree attains a height of 5m (15ft) in 10 years with a spreading habit forming a rounded crown.

'Delta'
This small tree is upright and forms an oval habit.

'Prairie Pride'
This small vigorous tree is upright and forms an oval habit with dark glossy leaves.

'Windy City'
This vigorous upright trunk tree has a spreading habit forming a rounded crown.