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Tall milkweed

Asclepias exaltata

Ozone injury usually appears as black or purple spots (stipple), yellow or white bleached spots (chlorotic mottle, needle tip burn), or leaf browning (necrosis). Ozone may also cause premature leaf drop (senescence).


photograph
Healthy Tall milkweed Berries
Courtesy, Natural Resources Conservation Service USDA
photograph
Healthy Tall milkweed
Courtesy, Natural Resources Conservation Service USDA

updated on 09/17/2006  I   http://nature.nps.gov/air/Pubs/bioindicators/tallMilkweed.cfm   I  Email: Webmaster