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Pinus tropicalis Morelet is endemic in the province of Pinar del Rio and Isla de la Juventud. In this paper the variation is evaluated in weight and viability of seeds from 4 seed areas of the province of Pinar del Rio, Cuba, which were harvested in July and stored for five months at room temperature until They were made to the corresponding analysis. Samples of each of the sources weretaken to determine the weight of 1000 seeds, as established methodology ISTA (1993). Viability was alsodoaj:0fe8ccbae34a400ba4f49cbb9026d6c2 fatcat:hzavjqxsgzedbfskjyecvbo4re