ADVANCE FOR USE MONDAY, MAY 12 AND THEREAFTER - This April 25, 2014 photo shows Pasqueflowers in bloom on Lyle Monsees farm west of Sioux Falls, S.D. An arctic relic left behind when the glaciers receded millennia ago, the pasqueflower adapted well to cold conditions, thriving on rocky, gravelly hillsides, says Dave Graper, professor of horticulture at South Dakota State University and director of the university's McCrory Gardens. (AP Photo/Argus Leader, Elisha Page)
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