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Ozone Sensitive Species:

The species selected for use in the ozone biomonitoring program are relatively common across a variety of forest types, they are relatively easy to identify and distinguish from similar species, and they are ozone sensitive based on a combination of field evidence and causative fumigation experiments. All of the eastern and western species were recently identified as good bioindicators by a panel of experts (http://www2.nature.nps.gov/air/).

 

Eastern Bioindicator Species

 

Scientific name	Common name
Asclepias spp.	common and tall milkweed
Prunus serotina	black cherry
Rubus allegheniensis	blackberry
Apocynum androsaemifolium	spreading dogbane
Fraxinus americana	white ash
Sassafras albidum	sassafras
Liriodendron tulipifera	yellow poplar
Aster macrophyllus	big-leaf aster
Liquidambar styraciflua	sweetgum
Prunus pennsylvanica	pin cherry

Eurybia macrophylla is a synonym for A. macrophyllus.

 

Western Bioindicator Species

Scientific name	Common name
Symphoricarpos oreaphilus1	mountain snowberry
Populus tremuloides	quaking aspen
Pinus ponderosa2	ponderosa pine
Salix scouleriana	Scouler’s willow
Physocarpus malvaceus	ninebark
Vaccinium membranaceum	huckleberry
Sambucus racemosa	red elderberry
Alnus rubra	red alder
Sambucus mexicana	blue elderberry
Pinus jeffrey	Jeffrey pine
Artemisia ludoviciana	western wormwood
Artemisia douglasiana	mugwort
Physocarpus capitatus	pacific ninebark
Rhus trilobata	skunk bush
Asclepias spp.	milkweed

Symphoricarpos spp. also included.
Pinus ponderosa var. scopulorum in Interior States; var.ponderosa in Coastal States