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Over 180 species of plants associated with causing allergy symptoms have been identified in Oklahoma. The map below shows botanical zones in Oklahoma with distinctive hay fever causing plants.
1- Oak-hickory-pine 4 - Grasslands
2 - Cypress-palmetto 5 - Mesquite-grasslands
3 - Post oak-blackjack oak 6 - Panhandle
Levetin and Buck, 1980. Hay fever plants in Oklahoma. Annals of Allergy, Vol 45: pp 26-32
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