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    • Regional phenological studies with Persian lilac (Syringa persica) 

      Hopp, R.; Vittum, M.; Canfield, N.; Dethier, B. (New York State Agricultural Experiment Station, 1972-06)
      Plants can be observed methodically year after year and dates can be recorded when certain distinguishable growth stages, such as opening of leaf buds or appearance of first flowers, occur. These plants may be considered ...