Arizona it is common in canyons. Ecology Larva of the giant swallowtail butterfly Papilio cresphontes feed on the leaves. Treehoppers of the genus Enchenopa infest the branches, laying white-frothy masses of eggs on the branch undersides. Several ant species tend to the treehoppers, including Camponotus pennsylvanicus, Formica montana, and Formica subsericea. Several bee species have been documented visiting the flowers of wafer ash, including Agapostemon virescens, Andrena commoda, Andrena crataegi, Andrena cressonii, Apis mellifera, Bombus auricomus, Bombus bimaculatus, Bombus impatiens, Ceratina calcarata, Ceratina dupla, Ceratina mikmaqi, and Lasioglossum imitatum. Uses It has several Native American uses as a seasoning and as an herbal medicine for different ailments. Numerous cultivars have been developed for ornamental use in parks and gardens. The cultivar 'Aurea' with golden leaves has gained the Royal Horticultural Society's Award of Garden Merit. German immigrants to Texas in the 19th century used its seeds in place of hops in the beer-making process, lending the species its common name. References Zanthoxyloideae Trees of the Northeastern United States Trees of the Great Lakes region (North America) Trees of the Plains-Midwest (United States) Trees of the Southeastern United States Trees of the Eastern United States Trees of the Southwestern United States Trees of Eastern Canada Trees of Ontario Trees of the North-Central United States Trees of the Southern United States Trees of the South-Central United States Flora of California Flora of Central Mexico Trees of Mexico Plants described in 1753 Taxa named by Carl Linnaeus Medicinal plants Garden plants of North America Trees of the United States