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Histograms of the distribution of flowering times for each trial. The flowering time of the S. viridis parent is indicated by a red column and that of the S. italica parent by a blue column. GH, greenhouse; GC, growth chamber; BT, Boyce Thompson Institute, Ithaca, NY; OK, Oklahoma State University, Stillwater, OK; F, field; GA, University of Georgia, Athens, GA.
