Technical Abstract: Small-type white clover, Trifolium repens, plants predominate in most closely-grazed pastures in the southeastern U.S. The role of relative seed production in stand persistence of white clover types has not been quantified in a pasture environment. The objective of this study was to compare the relative seed production of small-type naturalized populations with that of large-type white clover cultivars and germplasms in a pasture. Seven naturalized populations collected from closely-grazed pastures in Alabama, Georgia, Louisiana, and Mississippi were compared with `Louisiana S-1', `Osceola', `Regal', `Grasslands Huia', `Grasslands Prestige', Brown Loam Syn. No.2, and SRVR white clover. All entries were space-planted into plots in a common bermudagrass (Cynodon dactylon) pasture at Mississippi State, MS, and grazed with cattle prior to flowering and seed production. All naturalized populations averaged about three times as many flowers and seed-bearing flowers as all cultivars other than Louisiana S-1 each year. Flower production differences were consistent throughout the study, though maximum flower production for the populations was earlier in the season than cultivars. Seed production differences were similar to flower production, as cultivars averaged only 27 to 43% as much seed as naturalized populations. The low growth stature and excessive seed production of naturalized populations enable them to have a greater opportunity to reseed in pastures than common large-type cultivars. This reseeding potential probably contributes to the domination of small-type white clover in closely-grazed pastures of the southeastern U.S.