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(Pinus taeda L. and P. echinata Mill., respectively) seed crops were monitored for 20 consecutive years (1980-1981 through 1999-2000) using seed-collection traps in natural stands on the Upper Coastal Plain qf southeastern Arkansas. Each seed-collection period began on October 1 and continued through the end of February of successive years. Sound seeds were separated,fiom void seeds by use of a cut test. During 20 yr, sound seedproduction rangedfrom 0 to 2,OOO,OOO/ac. There were six bumper seed crops (>800,000 sound seeds/UC), nine good seed crops (40,000-800,000 sound seeds/UC), andjive poor seed crops (<40,000 sound seeds/UC). Because no poor seed crops occurred back-to-back, the seed supply was adequate for successful natural pine regeneration over the entire monitoring period. During 8 yr qf adequate

Twenty Years of Natural Loblolly and Shortleaf Pine Seed Production on the Crossett Experimental Forest in Southeastern Arkansas