The dominant vegetation in this zone is woody and the more important species are Quercas stellata (post oak), Quercus marilandica (blackjack oak), Juniperus virginiana (eastern red cedar), Ulmus spp (elm) and Populus deltoides (cottonwood), all of which cause hay fever problems. Juniperus ashei (mountain cedar) is found in this zone and causes winter and early spring hay fever. Close to 80% of the major causes for hay fever occur in this zone. The moisture level also allows for herbacious forms such as Cyndon dactylon (bermuda grass), Festuca pratensis (meadow fescue), Phleum pratensis (timothy), Rumex acetosella (sheep sorrel) and R. crispus (curly or yellow dock), all of which are major allergens. Species of Ambrosia and other weeds can also be abundant in the area.
Hay Fever Map