Thornless Honey Locust Tree - Gleditsia triacanthos var. inermis
Family: Fabaceae (Leguminosae)

This ancient tree has lost its wild thorns and giant seedpods as a result of man's careful cultivation.
Thorns on Locust Tree
Thorns seen on this Japanese Locust have been deselected in modern-day cultivars
The thornless honey locust has been an exceptionally popular tree for all types of landscapes. Small leaves on the open canopy allow pleasantly dappled light to reach the ground. The ability to grow grass under these trees has helped them reach the popularity they now enjoy. Unfortunately, numerous pests and diseases have infiltrated populations of honeylocusts, and popularity has declined. The trees produce dark-brown seedpods that can be a maintenance headache. They are easily transplanted and are adaptable to a wide soil range. Fruitless varieties are available with varying resistance to the numerous problems from which the species now suffers. The tree has some favorable aspects, but one should make a well-researched choice among available varieties to increase chances of success.
Honey Locust fall colors
This huge honey locust is one of Joy Morton's orginal plantings of 1923

May 31

December 25
Summer: The pinnately compound leaves (one large stem with many small leaflets) allow filtered sunlight, making an attractive canopy that is practical for growing grass or other plants below. Fall: Color in the fall is variable but is usually a shade of yellow and can be very nice. The large seedpods ripen and become a maintenance consideration for most of the fall and winter months. Wildlife cherishes the sweet pods from which the tree gets its name. The thorny specimen (Gleditsia triacanthos) from which this variety arose is one of the thorniest trees found. Thorns can protrude directly from the trunk and be a foot or more in length. Crews have been busy two decades at the University of Illinois at Urbana-Champaign taking down diseased honeylocust trees that were once planted to replace the declining American elms.

The native thorny species is found in Illinois, on either side of the Mississippi River from Nebraska to Texas and from Pennsylvania to Alabama. Fence rows and pastures are common locations.

Honey locust seed-pods and tiny leaves can present an annoying litter problem; shallow roots are easily damaged
References
1. Colorado State University, "Sunburst Honeylocust (Gleditsia triacanthos 'Sunburst')"
2. Thornless Honey Locust photos by Bruce Marlin
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Family: Fabaceae (Leguminosae)
The Fabaceae, or legumes, are mostly herbs but include also shrubs and trees found in both temperate and tropical areas. They comprise one of the largest families of flowering plants, numbering some 400 genera and 10,000 species. Peanuts, beans, peas, wisteria and locust trees are among the family.
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